Chambers of Xeric/Challenge Mode/Strategies

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The Chambers of Xeric's Challenge Mode is a Chambers of Xeric raid with increased difficulty. Here, players will encounter all possible bosses and rooms within the Chambers, with their combat stats increased. All the monsters within possess no new mechanics.

In order to attempt a Challenge Mode raid, party leaders must select the "Challenge Mode" box when forming a party.

Unlike the normal raid, a Challenge Mode raid is linear and contains three levels of rooms rather than the two normal levels that are randomly generated, with the final boss being the Great Olm:

Top level: Tekton, Jewelled Crabs, Scavenger beasts, Ice demon, Lizardman shamans, resource room

Middle level: Vanguards, Thieving room, Scavenger beasts, Vespula, resource room, Tightrope room

Lower level: Guardians, Vasa Nistirio, Scavenger beasts, Skeletal mystics, Muttadiles, resource room

Points

Points gained from the raid are based on player contribution and actions. They can get points from the following:

• Attacking monsters, though there are several exceptions:
  • Penultimate phase of the Great Olm; anytime it regains control of its hands, no points are given for any damage dealt to them.
  • Damaging a recovered abyssal portal.
  • When players battle mini-bosses, a "decay" point multiplier is put into effect. For example, players initially have a normal multiplier rate when disabling Vasa Nistirio's glowing crystals, but as the fight progresses, the "decay" will set in and prevent players from obtaining as many points as they normally would.
• Completing puzzle rooms.
• Making shortcuts in large ruin chambers (requiring Woodcutting, Mining and Strength if the obstacle is a rotten sapling, rock, or boulder respectively).

The points determine the team's potential rewards at the end of the raid, when the Great Olm is killed. The more points obtained, the higher the chance of obtaining unique loot. The more players in a raid attempt, the higher the points multiplier will be to compensate for increased difficulty. If members of the team leave, the points multiplier will decrease, but the difficulty will remain the same, to prevent players from exploiting additional points in smaller groups.

If a player dies in the chambers, 40 percent of their points will be removed from the player, which will lower the team's overall chance of getting unique rewards. For every 8,675 total points obtained, a 1% chance to obtain a unique loot is given. This chance is capped at 65.7% (570,000 points) - any further points will be sent to roll for a second unique loot. For example, a team which possesses 855,000 points in total has a 65.7% chance to receive a unique loot, and then a 32.85% chance to obtain a second unique loot. Up to three unique rewards can be obtained per raid, assuming that there are enough points to roll for them.

Note: If a team member continually dies in the raid with low points, the game will deduct points from the team's score instead rather than no penalty to discourage them from suiciding supplies into boss rooms.

Suggested skills

• 90+
  
• 90+
  
• 90+
  
• 90+
  
• 90+
  
• 90+
  
• 55+ not needed if another team member does the farming
  
• 78+ not needed if another team member prepares the potions for you. It is recommended that least one team member should have 90+ to make Overload+
  
• 77+ with Piety, Rigour and Augury unlocked

Equipment

Whilst learning Challenge Mode raids may be beneficial to leave certain items behind so you have more inventory space for Saradomin brews and Super restores. The ability to recover from mistakes will be a bigger bonus than some of these items provide whilst learning, so not everything from this guide needs to be taken. Due to the high difficulty of Challenge Mode raids it is highly recommended that you have the best possible items before facing it.

Recommended equipment for Melee

Slot	Item (most effective → least effective)
	Torva full helm	Neitiznot faceguard	Serpentine helm	N/A
	Amulet of rancour	Amulet of torture	Amulet of fury	N/A
	File:Infernal cape.pngInfernal cape	Fire cape	N/A	N/A
	Torva platebody	Bandos chestplate	N/A	N/A
	Torva platelegs	Bandos tassets	N/A	N/A
	Scythe of vitur	Inquisitor's mace or Ghrazi rapier	Dragon hunter lance	Abyssal dagger
	Avernic defender	Dragon defender	N/A	N/A
	See Ranged	N/A	N/A	N/A
	Ferocious gloves	Barrows gloves	N/A	N/A
	Primordial boots	Dragon boots	N/A	N/A
	Lightbearer	Ultor ring	Berserker ring (i)	Brimstone ring
	Elder maul	N/A	N/A	N/A

Recommended equipment for Ranged

Slot	Item (most effective → least effective)
	Masori mask (f)	Armadyl helmet	Blessed coif
	Necklace of anguish	Amulet of fury	N/A
	Ava's assembler	Ava's accumulator	N/A
	Masori body (f)	Armadyl chestplate	Blessed body
	Masori chaps (f)	Armadyl chainskirt	Blessed chaps
	Twisted bow	Dragon hunter crossbow	N/A
	File:Dragon arrow.pngDragon arrow/File:Amethyst arrow.pngAmethyst arrow	File:Ruby dragon bolts (e).pngRuby dragon bolts (e)	File:Ruby bolts (e).pngRuby bolts (e)
	Barrows gloves	N/A	N/A
	Pegasian boots	Blessed boots	N/A
	See Melee	N/A	N/A
	Toxic blowpipe	N/A	N/A

Recommended equipment for Magic

Slot	Item (most effective → least effective)
	Ancestral hat	N/A	N/A	N/A
	Occult necklace	Amulet of fury	N/A	N/A
	Imbued god cape	N/A	N/A	N/A
	Ancestral robe top	Virtus robe top	Ahrim's robetop	N/A
	Ancestral robe bottom	Virtus robe bottom	Ahrim's robeskirt	N/A
	Tumeken's shadow	Sanguinesti staff	Trident of the swamp	N/A
	Elidinis' ward (f)	Arcane spirit shield	Mage's book	Book of darkness
	See Ranged	N/A	N/A	N/A
	Tormented bracelet	Barrows gloves	N/A	N/A
	Any boots you're wearing should be unequipped whilst maging, or wear your melee boots if that's not possible	N/A	N/A	N/A
	See Melee	N/A	N/A	N/A

Rooms

Tekton

Main article: Tekton

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Tekton has high Defence but only uses Melee attacks. His attacks can deal heavy damage, though there is one disadvantage for him; his attacks have a small delay before they hit, meaning that a player can run corners to avoid getting hit by most of his standard attacks. However, his attacks can cleave clockwise. Tekton always starts with an orange aura around him, which has lower Defence than his red aura.

After several attacks, or if his attacks are interrupted (no-one in range), he will return to the anvil. Players under him as he returns to the anvil will take rapid stomp damage. He can still be attacked as he makes his way back to the anvil.

When Tekton goes back to the anvil, he will repair himself, recovering a percentage of his hitpoints. While he is at the anvil, he will send up to two sparks flying for each player in the chamber, which have a 3x3 AoE and will deal 10-20 damage to anyone hit by them. They can be avoided by simply running two spaces away from your current spot when the sparks are flying. After five sets of sparks, he will resume combat, this time in an "enraged" stance (red aura), dealing significantly more damage whilst having higher Defence.

Tekton should be fought with Elder maul/Bandos godsword special attacks. These can lower Tekton's defence as his high Defence and bonuses against non-crush attacks can make him near impossible to kill otherwise

Tekton drops five stinkhorn mushrooms, two overload (+) along with a single revitalisation (+) and prayer enhance (+) upon death. There is a rare chance for an onyx to be dropped.

Due to Tekton's high defences, it is recommended to bring an extra weapon to target Tekton's weakness to crush

Recommended equipment for Tekton

Slot	Item (most effective → least effective)
	Scythe of vitur	Inquisitor's mace	Osmumten's fang	Ghrazi rapier	Zamorakian hasta

If you don't want to bring an extra weapon for Tekton, your normal weapon can still deal damage to Tekton, it will just be inaccurate

Crab puzzle

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Typical layout of a crab puzzle room.

In this chamber are several Jewelled Crabs which cannot be killed by conventional combat. The main purpose of these crabs is to reflect orbs that the carved sculpture nearby emits. Getting hit by the orb will deal 10-30 damage onto the player that blocked its path. The crabs deal reasonably high damage, so use Protect from Melee while luring them into place.

The goal is to turn the coloured crystals in the chamber white. The crystals on the crabs can be attacked to change colour; red for melee, blue for magic, and green for ranged. The white orb emitted from the carving must be reflected off the crabs in the room to hit the crystals. Note that a coloured orb cannot change colour again - if a green orb hits a red crab, it will disappear.

The crabs can be temporarily bound in place with a standard hammer. One of these will spawn at the start of the room. The dragon warhammer or elder maul can also be used to bind the crabs, but it must be wielded first. Note that the crab's crystals will turn red temporarily when hit by it.

All layouts require the use of three crabs. The more players in a raid, the more crabs will be present in the room. Excess crabs should be distracted with other players as they often wander into the orb's path and potentially disrupt it.

This is one of the few rooms in Challenge Mode raids that isn't made harder, allowing for it to be completed with little issue

Crystal	Orb Colour	Style
Black	White	None
Yellow	Blue	Mage
Cyan (Blue)	Red	Melee
Magenta (Purple)	Green	Range

Ice demon

A group of players face the ice demon.

Ice Demon is killed much like in normal raids. If possible making a storage chest using the scavenger room beforehand will make collecting kindling for the fires easier, and can be used futher on in the raid. It is recommended to store some additional axes from the ground spawns if you intend to chop the meat tree at Mutadile.

Once thawed it is recommended that at least one player has Fire Surge to attack Ice Demon with, whilst the rest of the players assist with Twisted Bows. Pray Ranged as normal. Players can safe spot Ice Demon by standing in the corners either left or right from the entrance. The side with the darker floor will be the safe spot. It is recommended to have Fire Surge users safe spot Ice Demon, but other players must be targetable by Ice Demon else the safe spot will no longer work

Lizardman Shamans

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A small room filled with at least two lizardman shamans (dependent on party size) are in the room, with several spawns blocking the way forward. They share the same mechanics as the shamans outside. The strength of the shamans is also dependent on the party size. It is recommended to try and agro only one shaman at a time due to the strength of their attacks

After Shamans there will be a prep room, where it is recommeneded to use the seeds dropped to replenish supplies before going onwards to the second floor

Vanguard

Main article: Vanguard

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It is important to remember which Vanguard is which for fighting them

The Vanguards are three separate entities, so individually, they have less health compared to other bosses. The Vanguards are the only raid bosses that do not have a barrier mechanic at the entrance to their room aside from the Guardians.

Each Vanguard uses one form of attack and is weak to a different form of attack in return.

The melee Vanguard attacks a single player three times at once and Pray from Melee should be used. This Vanguard is weak to magic attacks. Because of this it is recommended for one person to bring Ice Barrage to freeze the melee Vanguard, this allows players to be able to remain out of melee range so that you take less damage and switch Protect from Melee if you feel confident.

The ranged Vanguard will throw three rocks that deal damage in an area and Pray from Missiles should be used. This Vanguard is weak to melee attacks.

The magic Vanguard will fire three balls of lava that deal damage in an area and Pray from Magic should be used. This Vanguard is weak to ranged attacks

Damage maintenance is key to fighting the Vanguard. They have a unique healing property where all three will fully heal themselves if there is a large difference (33%, or 40% in teams of less than five) between their health. Slowly damage each Vanguard, ensuring that the damage between them is equal to prevent them from healing. While they are out of their shells, their health bar is shown to help players with damage maintenance.

After being out of their shells for a while, the Vanguard retreat back into them and shuffle around in either a clockwise or counterclockwise formation. Trample damage is only applied when they're shuffling. It is recommended for each player in a team to focus on one Vanguard, and follow it when it moves to it's new position

Although each Vanguard possesses a high Magic level, the twisted bow is ill-advised because of the health mechanic and the fact that the melee and ranged Vanguards also have high ranged defence bonuses. For this same reason using a Scythe of Vitur is not recommended, as it is easy to deal too much damage and reset the healths to 100%

Each Vanguard drops the combat potion (+) of their combat style, along with Xeric's aid (+), Revitalisation (+) and at least one Overload (+) with the potential to up to 3.

Thieving

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Players search for cavern grubs within the chests.

A corrupted scavenger blocks the path and must be fed cavern grubs until it becomes full and tired. Cavern grubs can be found by opening many of the chests located in the room. The scavenger's hunger level can be tracked with the bar above its head.

The chests have a chance of containing the cavern grubs required, though it may instead contain unhatched cocoons. These odds are dependent on the player's Thieving level. Thieving is required to open the chests, though experience is only gained when grubs are collected. The chances a chest opening depends on whether the player has a lockpick or hair clip. The prior are dropped by other Scavenger beasts found throughout the raid.

One of these chests always contains a one-time loot of five psykk bats. A few chests may contain poison which is released when opened, dealing 1-3 damage to anyone next to the chest. This does not inflict poison on the player (nor will poison immunity prevent it). Remember which chests contain poison, as the poison chests will automatically lock itself like the grub ones.

If run energy is a concern, find a cluster of three to four chests that are placed in a way that the player only needs to walk 1 square to reach the next chest to save run energy. All layouts have at least one of these clusters. If that is not possible (due to one of those chests being poisoned), simply walk around the room and open the chests as you go.

When players have at least 10 grubs collected, start feeding the scavenger, then continue collecting more. The scavenger's health bar will start regenerating if it hasn't been fed for at least one minute after it stopped eating. In a solo raid, 30 grubs will be needed to make the scavenger sleepy provided this doesn't happen.

While these rooms are fairly easy with no risk of dying, they are often skipped because they take a considerable amount of time compared to the other puzzles.

Players can search the creature keeper to obtain his journal.

Vespula

Main article: Vespula

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A group of players in Vespula's chamber.

In the chamber will be Vespula herself, four lux grubs and an abyssal portal. The portal must be destroyed to dispel Vespula and her offspring.

Vespula has very strong poison (starting at 20 damage), so a form of poison protection is required when fighting her.

Vespula will sting the lux grubs from time to time, causing their health to degrade. If fully degraded, it will turn into a Vespine soldier, fully healing both Vespula and the portal. Therefore, it is important to prevent the lux grubs from transforming into Vespine soldiers. In the other end of the chamber are several Medivaemia blossom plants which can be picked. The blossoms are then given to the grubs to restore their health.

In a group, one member should focus on collecting the blossoms and giving it to the grubs to prevent them from turning into soldiers. The rest of the team should focus on damaging the Abyssal Portal.

To do this, players must stand on a specific row of tiles just outside of Vespula's melee range. In the image shown this is the tile just right of the right Lux grub. Players can then use their long ranged weapons to flinch the portal while using their Redemption prayer to stay alive. It is recommended to bring an extra Super restore for raids with Vespula, due to repeatedly using Redemption draining your prayer faster than normal

Recommended equipment for Vespula

Slot	Item (most effective → least effective)
	Harmonised nightmare staff	Twisted bow	Sanguinesti staff	Trident of the swamp	Trident of the seas

When the player's Redemption triggers, they should sip a dose of restore while on the safespot, and resume the flinching method once they've turned their prayers back on. The highest Vespula's stomp damage can hit is 8, so as long as the player has at least 9 health or higher, they will be safe. This method can be rough on supplies, so players are recommended to bring at least one extra Super restore potion than they would normally bring for raids containing Vespula.

Although she can be significantly problematic for beginners, she becomes one of the easiest mini-bosses when players obtain enough experience.

Tightrope

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The tightrope must be crossed to obtain the keystone.

A group of deathly rangers and mages stand on a platform with a tightrope running in between. They must be attacked with either ranged (toxic blowpipe) or magic in order to damage them. Both groups frequently hit through prayer, but protection prayers reduce the damage. A keystone must be grabbed from the other side to dispel the barrier leading deeper into the dungeon. The tightrope requires Agility in order to cross, the level requirement of which is determined by the party's average.

While they are tolerant to players, if any player attempts to cross the tightrope, they will immediately attack the crosser, unless they are fighting another player. For this reason, all enemies should be killed or distracted to allow the crosser to go through safely. After crossing the tightrope, all damage is inflicted in one tick, so it is possible for players to be instantly killed if they attempt to cross the rope with enemies attacking them.

The mages should be killed first, as while they are just as accurate as the rangers, their max hit is significantly lower. When dealing with rangers in a group, one player should aggro the selected target before hiding behind an obstacle. This prevents the ranger from attacking as much. The "tank" should take a hit every three to four blowpipe hits to ensure that the ranger does not change aggro to an attacker.

Protect from Magic/Missiles does not provide full protection - it simply reduces the deathly opponents' damage by 50%.

When the keystone is used on the barrier, any surviving enemies will be automatically killed.

Guardians

Players attacking the guardian statues.

Two Guardian statues are guarding a passageway deeper into the chambers. The statues must be destroyed, as they will shove players away from the passageway if they try to get past them. They can only be harmed through pickaxes, best set to the Smash attack style; all other sources of damage will not count.

Recommended equipment for Guardians

Slot	Item (most effective → least effective)
	Crystal pickaxe	Dragon pickaxe	Rune pickaxe

The Guardians attack with a cleaving melee attack and can occasionally stomp the ground, making a rock fall from the ceiling, which deals moderate to heavy damage in a 3x3 area. Due to the Guardians' stomping attack, it is highly recommended to flinch them to reduce the amount of damage taken. When flinching, run two tiles away from the Guardian immediately after attacking, so that the stomp attack can be completely evaded if it manages to retaliate back.

The strength of the Guardians is dependent on the party size. Guardians drop seeds, but significantly less than the Skeletal mystics and Lizardman shamans.

The special attack of the toxic blowpipe, Saradomin godsword, Guthan's set, Blood spells, and Sanguinesti staff will heal accordingly despite not dealing any damage on them. Similarly the special attack of the Elder maul and Bandos godsword, while not dealing any damage, can still reduce the Defence of the Guardians. The Guardians regenerate their stats quicker than other NPC's, however, making this inefficient until massive scales (30+ participants) are reached.

Vasa Nistirio

Main article: Vasa Nistirio

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A group of players in battle with Vasa Nistirio.

Before starting the fight, it is important that one player with low health awaken him. While this will cause flames to appear at the entrance, Vasa immediately performs his special attack upon starting the fight. Players should not stand near where the flames will show up either, as they will also be included in his special attack.

Vasa's special attack can be deadly for those unprepared. He teleports half of the team next to him, while the other half are placed randomly across the room. He will then launch multiple projectiles near him, dealing heavy damage (player's current hitpoints at that time minus 5), so it is recommended to keep health low and quickly heal up to avoid being comboed out. In groups, the players teleported to the edges of the room should activate Protect from Magic and quickly move to next to him, as it will reduce the damage of this attack to deal 50% of the stunned players' health instead.

Vasa heals himself by going one of the four crystals in the corners of his chamber. The one that he heads to will always glow, so head there and attack the glowing crystal. The crystals usually give the most points in the encounter. They are extremely resistant to non-stab attacks, so a stab weapon is highly recommended in deactivating them. Vasa will return to the middle of the room if he finishes healing from the crystal, or it is disabled by the team. On every third crystal, Vasa will walk over to it but immediately make his way back to the centre of the room, so the glowing crystal should be ignored and players whittle his health down quickly to conserve supplies.

Recommended equipment for crystals

Slot	Item (most effective → least effective)
	Ghrazi rapier	Inquisitor's mace set on stab	Zamorakian hasta	Dragon hunter lance	Dragon sword

Vasa has a high Magic level, so the twisted bow is highly recommended to end the encounter quickly, as a prolonged fight will exhaust the player's supplies significantly faster compared to the other bosses. Otherwise, use a blowpipe.

As his standard attack, he expels boulders from himself and land at the player's position. This can be avoided by running away (they have a 3x3 AoE); Protect from Missiles will reduce the damage from this attack. He also has a trample attack for players underneath him.

Upon death, Vasa drops two Xeric's aid (+) and twisted (+).

Skeletal Mystics

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Players fight against several Skeletal mystics.

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In this room, there is a varying amount of Skeletal mystics left behind to perform sacrifices for the dark altar. The mages attack with magic from distance, and melee if players get close to them. The mages take the player's overhead prayers into account. However, if the mage cannot melee the player, they will focus on magic instead. In some areas of the chamber, it is possible to trick the mages into attempting to use melee, but is not recommended as the mystic is likely to target another player and make the safespot useless.

Protect from Magic reduces the mystics' accuracy and damage by roughly 50%. The salve amulet(ei) should be brought to raids with Skeletal Mystics as it significantly speeds up the completion of this room.

Kill all the mystics before proceeding. The strength and number of mystics is dependent on the party size. The toxic blowpipe does the most damage but the reduced attack range may lead to multiple mages attacking the player at the same time. Whenever possible use a toxic blowpipe, otherwise use a longer range weapon such as a twisted bow or crossbow. In general, killing the mystics faster means conserving more supplies than aggroing fewer of them.

The mystics drop seeds upon being killed.

Muttadiles

Main article: Muttadile

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Upon starting, several noxious tendrils will appear which deal damage to players who try to leave the chamber. There are also two Muttadiles; a small one walking around the chamber, and a second, larger Muttadile lurking in the water. A meat tree is also nearby.

The small Muttadile only attacks with both Melee and Ranged, while the larger one uses all three and has a special shock wave attack that can deal massive damage; however, this attack is only used against players in melee range. During the fight with the small Muttadile, the larger one will occasionally attack players in the chamber with Magic. Both can do large damage in melee range, so remain at a distance wherever possible

When the Muttadile reaches around 40-50% of its health, it will go to the meat tree and eat from it to restore health. A common way of speeding up kills is to successfully freeze the Muttadile in place and continue attacking it until it stops going for the tree. For this reason, the Zamorak godsword or Ice Barrage is useful. With Ice Barrage being recommended against the small Muttadile and using the Zamorak godsword special attack against the larger Muttadile as it possesses a high Magic level. This shouldn't be done if Tekton is the next room, as being able to use a special attack there is more important. Muttadiles will eat from the tree up to three times (each time consisting of two bites), after which they will not eat from it anymore. It is possible to trap the Muttadiles to prevent them from eating the meat tree, though this usually requires a bit of effort and is not quite reliable, especially for the smaller one. The larger one often tends to get stuck on a root depending on the layout of the room and its position.

Once the small Muttadile dies, the larger one will emerge and attack. Use ranged against both Muttadiles (blowpipe against the smaller, Twisted bow or blowpipe against the larger) and avoid being within melee distance of them, while using Protect from Missiles. Muttadiles should be killed carefully, as while they're significantly easier compared to the other bosses, their erratic behaviour can easily kill a careless player.

The small Muttadile drops an Overload (+) and Prayer enhance (+) upon death, while the larger one also drops those alongside a Xeric's aid (+) and Revitalisation (+).

Great Olm

Main article: Great Olm

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The Great Olm is the last boss in the raid.

For small teams (1 to 7 players), the Great Olm only has three phases. This section assumes that the team has seven or fewer players.

Before starting, ensure that you have all of your equipment and supplies required for Olm, as you cannot leave the Great Olm's chamber unless you die.

Olm will start either on the west or east side of the chamber. It will also start with one of three powers; fire, acid, or crystal, which determines the special attacks it uses. To force the Great Olm into the next phase, both hands must be disabled. His left hand is weak to melee attacks, while his right hand is weak to magic. Attacking his head on any non-final phase is highly discouraged, since he will automatically regenerate health and it yields no points.

Fire is the most dangerous mechanic, as it is the only attack with extremely high killing potential due to Olm's high damage, especially if the player is unfortunate enough to get stuck in a fire wall and Olm performs a teleport attack at the same time. This is less of a threat in group encounters, but in solo encounters it is dangerous if the player lacks water spells to break out.

During the first two phases, if the left hand takes too much damage, Olm will temporarily clench it. This prevents it from performing special attacks (lightning, crystal and teleport), but it cannot be harmed. Olm will loosen its grip after a set amount of time has passed, or if the right arm is disabled. If the left hand is disabled first, it will simply prevent Olm from performing any special attacks for the remainder of the phase; this is unfeasible as it will clench very often.

"Blind spots" exist against Olm. This is only useful for soloing, as it requires unnecessary coordination in larger groups. By running in specific spots, Olm moves its head accordingly in order to "see" the player. In addition to preventing Olm from attacking, it also skips an attack in the process - for example, if the player uses a blind spot when Olm has already attacked twice after its lightning attack, it skips the teleport attack. Using the blind spots while attacking Olm requires practice; the right hand is considerably easier than the left. Players can use a 1:0 or 4:1 attack pattern on the left hand; 1:0 is a beginning method where the player attacks once with a slow weapon such as an elder maul while preventing Olm from attacking. It is considerably slower than the 4:1 attack pattern since the player uses a faster weapon like an abyssal tentacle.

In groups of three or more, the middle player(s) are designated as the "head" runner(s), moving left and right to shift Olm's attention on both sides. Runners do not need to use as many supplies, and as a result, drop supplies to any players that may need them.

When forced into the next phase, Olm will retreat back underground and shake the cavern. Crystals will fall from above, dealing moderate damage covering a 3x3 radius, with shadows indicating where they will fall. One crystal will always target a player in the room, but it can be easily avoided. After enough time has passed, it will appear on the other side and start using a new power alongside its old powers.

In the penultimate phase (when its head glows with a green aura), both arms must be disabled simultaneously to force Olm into the next phase. Weaken one hand; when that hand is on low health, focus on the other hand and disable it. In most cases, this means weakening the right hand and disabling the left hand. Once a hand is disabled, Olm loses control of it. A bar will appear over that gap; if filled before the other hand is disabled, Olm will regain control of its disabled hand with full health. The restored hand does not yield any points either.

In the last phase, Olm will attempt a final stand. The head can now be attacked, as its regeneration property is removed. Olm will use all mechanics from the previous phases (barring the teleport attack), instead getting the ability to sap health. When it does this, Olm sends out two blue projectiles at two random tiles in the room; when on top of them, it protects the player(s) from its sapping attack. Players should move continually during this phase, but not in an erratic way, as crystals continually fall from above until Olm is killed. Players should keep their health high to avoid being killed from the increased sources of damage.

Once killed, the crystal surrounding the chest shatters and players can claim their rewards from there before returning to the surface.

Bosses

There are several bosses that can be encountered in a raid. Four to six bosses can be expected in a raid, one always being the Great Olm.

List of bosses:

• Tekton
• Vespula
• Vasa Nistirio
• Vanguards
• Muttadiles
• Lizardman shamans
• Skeletal mystics
• Great Olm (always the last boss)

Puzzles

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Some sections might not be fully accurate or complete. You can help by contributing small edits to the page, to avoid conflicting with the work of other editors.

Resources

The Chambers of Xeric have various resources which can be used in the raid to make things easier. For healing whilst there are many options in most raids only Xeric's Aid is used, with exception to the bats occasionally gotten from the thieving room.

It is recommended to have at least one person with 90+ Herblore in a raid, so that each person can have one Overload (+), one Prayer enhance (+) and the rest of their inventory filled with Xeric's aid (+) and Revitalisation (+). This allows for highly boosted stats, prayer point regeneration, as well as healing, and prayer and stat restoration. Only one Overload and Prayer enhance is needed in an Olm fight due to the length of their effects. Whilst the prayer restoration is the more important part of Revitalisation potions, they can be used to restore your magic stat quickly should you need to save someone from Olm's fire attacks, as Overloads only reset drained stats every 15 seconds. Raids can be completed with lower Herblore levels, due to the amount of Overload (+) dropped by bosses such as Tekton and Mutadile meaning you may not need to make any yourself

Potions may be used in other rooms should they be dropped by previous bosses. A Prayer enhance (+) can ofset the prayer drain of Protect from Melee in the crabs room, and make Vespula a lot easier. Overload (+) can be used in many of the combat rooms to great effect.

Storage units are built from mallignum root planks, obtained as drops from scavengers. A hammer is required in building storage units, with the dragon warhammer and elder maul both being suitable substitutes. These are important for allowing you to make potions with greater ease, but care should be taken to not overfill them.