Slayer task/Fossil Island wyverns
| Fossil Island Wyverns | |||||||||||||||||||||||||||||
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| Requirements | |||||||||||||||||||||||||||||
| Skills |  66 | ||||||||||||||||||||||||||||
| Combat level |  60 | ||||||||||||||||||||||||||||
| Other | Completion of Bone Voyage | ||||||||||||||||||||||||||||
| Task amounts | |||||||||||||||||||||||||||||
 Chaeldar | 10-20 (55-75) | ||||||||||||||||||||||||||||
 Konar | 15-30 (55-75) | ||||||||||||||||||||||||||||
 Nieve | 5-25 (55-75) | ||||||||||||||||||||||||||||
 Duradel | 20-50 (55-75) | ||||||||||||||||||||||||||||
| Advanced data | |||||||||||||||||||||||||||||
| Icon ID | 21507 | ||||||||||||||||||||||||||||
Fossil Island Wyverns are a Slayer monster requiring 66 Slayer to kill. A combat level of 60, as well as the completion of the quests Elemental Workshop and Bone Voyage, is required for them to be assigned as a slayer task.
Wyverns have an icy breath attack which, without a protective shield, can deal over 50 damage and freeze the player to prevent attacking and movement. To reduce this damage, an Elemental shield, Mind shield, Dragonfire shield, Dragonfire ward, or Ancient wyvern shield must be equipped. Among them, only the Ancient wyvern shield can block the freeze effect; the other protective shields only reduce the damage. The Anti-dragon shield, Protect from Magic prayer, and antifire potions cannot be used as a substitute for these shields. As such, using two-handed weapons such as the Toxic blowpipe or Abyssal bludgeon is highly discouraged.
For players seeking to complete the task quickly, it is recommended to kill either Spitting wyverns or Long-tailed wyverns, as they have the weakest attacks. Between the two, there are minor pros and cons. When not in melee distance, long-tailed wyverns always attack with its icy breath, whereas spitting wyverns often attack with Ranged instead of using its icy breath. Since this Ranged attack can be prayed against and icy breath damage cannot be fully blocked, players may find fighting spitting wyverns easier, especially when not using an Ancient wyvern shield to block the freeze effect. When staying in melee distance, long-tailed wyverns may be preferred, as using Protect from Melee will prevent all non-icy breath damage. However, in between kills and picking up drops, another long-tailed wyvern may attack, using only its icy breath until in melee distance.
For players seeking a more generous drop table, it is recommended to kill Ancient Wyverns, though these require 82 Slayer rather than 66 and are significantly more meddlesome to handle.
Wyverns may drop Fossil Island fossils of various sizes. Both caves have a Fossil Storage box by their respective entrances.
Shield Comparison Against Icy Breath
| Icon | Shield Name | Reduces Damage | Prevents Freeze | Notes |
|---|---|---|---|---|
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Anti-dragon shield | No | No | |
 
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Elemental or Mind shield | Yes | No | Obtained during Elemental Workshop I and II. |
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Dragonfire shield | Yes | No | Requires  90 , an Anti-dragon shield, and a Draconic visage to create.
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Dragonfire ward | Yes | No | Requires 90 , an Anti-dragon shield, and a Skeletal visage to create.
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Ancient wyvern shield | Yes | Yes | Requires 66 ,  66 , an Elemental shield, and a Wyvern visage to create.
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Slayer Unlocks
| Unlock | Points cost | Notes | |
|---|---|---|---|
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Stop the Wyvern | 500 | This Unlock allows you to block fossil island wyverns without it counting towards your block list, albeit much more expensive than using a block list slot in terms of slayer points used. |
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Wyver-nother two | 100 | The extension unlock for fossil island wyverns, which brings all tasks amounts up to a range of 55-75 assigned per task. |
Monster Variants
| Monster | Combat Level | Slayer XP | Locations | Notes |
|---|---|---|---|---|
| Spitting Wyvern | 139 | 205 |
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Attacks with melee, ranged, and icy breath. Requires level 66 Slayer to kill. |
| Taloned Wyvern | 147 | 205 |
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Attacks with melee, typeless ranged, and icy breath. Because of its typeless ranged attack, it is the least favorable of the wyverns to kill. Requires level 66 Slayer to kill. |
| Long-tailed Wyvern | 152 | 205 |
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Attack with only melee and icy breath, so it is recommended to either range with an ancient wyvern shield or melee with Protect from Melee active. Requires level 66 Slayer to kill. |
| Ancient Wyvern | 210 | 315 |
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Attacks with melee, typeless ranged, and icy breath. Has higher stats but better drops compared to the other wyverns. Requires 82 Slayer to kill. |
Location Comparison
| Location | Maplink | Amount | Multicombat | Cannonable | Safespottable | Notes |
|---|---|---|---|---|---|---|
| Wyvern Cave,
east of Museum Camp |
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No | No | No | ||
| Task-only Wyvern Cave,
inside the Mushroom Forest |
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No | No | No |
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Equipment
Players simply tank the wyverns by maximising their ranged Defence via Barrows, Bandos equipment or Justiciar armour (if affordable). Optimise ranged defence and use Protect from Melee, since their ranged attack hits through protection prayers. High-level food like anglerfish or sharks is recommended. The player's Prayer points can also/instead be used on Piety, and bringing at least two prayer potions is strongly advised, as well as being easily paid for by the wyvern bones collected. Note: The ancient wyvern shield is the only shield that grants immunity against the freezing effect from a wyvern's icy breath. The dragonfire shield, mind shield or elemental shield can be used, but you will occasionally become frozen. Anti-dragon shield will NOT work
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Inventory
- 1 Divine super combat potion
- 3-4 Prayer potions
- An emergency teleport (optional)
- Rest sharks or better
- Herb sack (optional; if doing the ancient wyvern)
- Seed box
- Rune pouch
- Bonecrusher (optional; if not selling wyvern bones)
Protect from Melee with Sunfire fanatic, Proselyte, or Initiate armour equipped. The player may also choose to use Piety (and optionally Preserve) or weaker accuracy-boosting prayers to speed up kills, but at greater cost. At least one prayer potion will be needed using this setup, and more if using boosting prayers. Verac's equipment has significantly higher Defence than Proselyte armour with slightly less Prayer bonus and is a good choice if you are looking for a compromise between Defence bonuses and Prayer bonuses.
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Inventory
- 1 Divine super combat potion
- 3-4 Prayer potions
- An emergency teleport (optional)
- Rest sharks or better
- Herb sack (optional; if doing the ancient wyvern)
- Seed box
- Rune pouch
- Bonecrusher
Magic can be a feasible method to kill the wyverns if players have high Magic levels and can afford the upkeep cost on powered staves. Although Melee is much more profitable, Magic can still be utilised if the player wishes to do so, but it is strongly recommended to stand several spaces away from the wyvern to avoid Melee damage. Mystic Might or Augury can also be used to speed up kills.
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Inventory
- Imbued heart
- 3-4 Prayer potions
- An emergency teleport (optional)
- Rest sharks or better
- Herb sack (optional; if doing the ancient wyvern)
- Seed box
- Rune pouch
- Bonecrusher
Although players will get slower kills, Ranged can still be used. If players wish to do so, be aware of the negative bonuses that both the Ancient and Dragonfire shields possess. Nonetheless, it is strongly recommended to stand several spaces away from the wyvern to avoid Melee damage. Eagle Eye or Rigour can also be used to speed up kills.
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Inventory
- Divine ranging potion
- 3-4 Prayer potions
- An emergency teleport (optional)
- Rest sharks or better
- Herb sack (optional; if doing the ancient wyvern)
- Seed box
- Rune pouch
- Bonecrusher