Lobstrosity

Lobstrosity
Released	7 September 2017 (Update)
Members	Yes
Combat level	68
Size	3x3
Examine	An extremely vicious lobster type thing.
Combat info
XP bonus	+0%
Max hit	9
Aggressive	Yes
Poisonous	No
Attack style	Stab
Attack speed	4 ticks (2.4 seconds)
Respawn time	25 ticks (15 seconds)
Slayer info
Slayer level	None
Slayer XP	50 xp
Category	Scorpions
Assigned by
Combat stats
Aggressive stats
Melee defence
Magic defence
+99	No elemental weakness
Ranged defence
Immunities
Poison	Not immune
Venom	Not immune
	Open in DPS calculator
Advanced data
Monster ID	7796

Lobstrosities are giant "lobster-type thing[s]" located in the south-east corner of the Underwater area of Fossil Island. Most weapons and shields cannot be equipped in this area. Weapons that can be equipped and used to kill lobstrosities include the dragon harpoon, merfolk trident, trident of the seas/swamp, brine sabre, and magic secateurs. Lobstrosities may also be killed with magic.

A fishbowl helmet cannot be worn in this area, but players can easily use the nearby air bubbles to replenish oxygen while fighting lobstrosities.

Seaweed spores will spawn around the area randomly. Though not confirmed, it appears that re-entering the area using the rift or underground tunnel after receiving three spawns of seaweed spores increases the amount of random seaweed spores that spawns afterwards.

Locations

Location

Levels

Members

Spawns

Map

League region

Underwater area of Fossil Island

68

9

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Misthalin✓

Drops

Drop rates estimated based on 214,390 samples from the Drop Rate Project, unless otherwise cited.

100%

	Item	Quantity	Rarity	Price	High Alch
	Raw lobster	1	Always	74	42

Runes

Item	Quantity	Rarity	Price	High Alch
Water rune	100	8/118	500	200
Chaos rune	20	8/118	2,040	1,080
Death rune	10	5/118	1,600	1,080
Nature rune	10	6/118	1,070	1,080

Noted herbs

2 herbs are dropped at a time, and can be of different types.

Item	Quantity	Rarity	Price	High Alch
Grimy kwuarm	1 (noted)	2 × 15/944	3,574	12
Grimy cadantine	1 (noted)	2 × 3/236	2,987	13
Grimy lantadyme	1 (noted)	2 × 9/944	1,861	13
Grimy dwarf weed	1 (noted)	2 × 3/326	2,036	14

Un-noted herbs

There is a 14/118 chance of rolling the herb drop table. 2 herbs are dropped at a time, and can be of different types.

Item	Quantity	Rarity	Price	High Alch
Grimy guam leaf	1	1/33.7	326	7
Grimy marrentill	1	1/45	398	8
Grimy tarromin	1	1/59.9	379	9
Grimy harralander	1	1/77.1	676	9
Grimy ranarr weed	1	1/98.1	6,709	18
Grimy irit leaf	1	1/134.9	1,472	10
Grimy avantoe	1	1/179.8	3,263	10
Grimy kwuarm	1	1/215.8	3,574	12
Grimy cadantine	1	1/269.7	2,987	13
Grimy lantadyme	1	1/359.6	1,861	13
Grimy dwarf weed	1	1/359.6	2,036	14

Seeds

There is a 4/118 chance of dropping 2 seeds from the Uncommon seed drop table, and a 5/128 chance of dropping 1 seed from the Rare seed drop table.

	Item	Quantity	Rarity	Price	High Alch
Seaweed spore.png: Lobstrosity drops Seaweed spore with rarity 6/118 in quantity 5	Seaweed spore	5	6/118	765	60
Limpwurt seed.png: Lobstrosity drops Limpwurt seed with rarity 1/225.7 in quantity 1	Limpwurt seed	1	1/225.7	16	7
Strawberry seed.png: Lobstrosity drops Strawberry seed with rarity 1/236 in quantity 1	Strawberry seed	1	1/236	7	10
Marrentill seed.png: Lobstrosity drops Marrentill seed with rarity 1/247.3 in quantity 1	Marrentill seed	1	1/247.3	14	1
Jangerberry seed.png: Lobstrosity drops Jangerberry seed with rarity 1/336 in quantity 1	Jangerberry seed	1	1/336	5	36
Tarromin seed.png: Lobstrosity drops Tarromin seed with rarity 1/363.7 in quantity 1	Tarromin seed	1	1/363.7	14	1
Wildblood seed.png: Lobstrosity drops Wildblood seed with rarity 1/372.5 in quantity 1	Wildblood seed	1	1/372.5	33	8
Watermelon seed.png: Lobstrosity drops Watermelon seed with rarity 1/490.7 in quantity 1	Watermelon seed	1	1/490.7	34	33
Harralander seed.png: Lobstrosity drops Harralander seed with rarity 1/552.1 in quantity 1	Harralander seed	1	1/552.1	38	2
Snape grass seed.png: Lobstrosity drops Snape grass seed with rarity 1/772.9 in quantity 1	Snape grass seed	1	1/772.9	7,566	56
Ranarr seed.png: Lobstrosity drops Ranarr seed with rarity 1/792.7 in quantity 1	Ranarr seed	1	1/792.7	27,298	30
Whiteberry seed.png: Lobstrosity drops Whiteberry seed with rarity 1/909.3 in quantity 1	Whiteberry seed	1	1/909.3	10	79
Mushroom spore.png: Lobstrosity drops Mushroom spore with rarity 1/1,066.1 in quantity 1	Mushroom spore	1	1/1,066.1	123	51
Toadflax seed.png: Lobstrosity drops Toadflax seed with rarity 1/1,145 in quantity 1	Toadflax seed	1	1/1,145	1,406	6
Belladonna seed.png: Lobstrosity drops Belladonna seed with rarity 1/1,717.6 in quantity 1	Belladonna seed	1	1/1,717.6	175	106
Irit seed.png: Lobstrosity drops Irit seed with rarity 1/1,717.6 in quantity 1	Irit seed	1	1/1,717.6	63	3
Poison ivy seed.png: Lobstrosity drops Poison ivy seed with rarity 1/2,378.2 in quantity 1	Poison ivy seed	1	1/2,378.2	16	99
Avantoe seed.png: Lobstrosity drops Avantoe seed with rarity 1/2,576.3 in quantity 1	Avantoe seed	1	1/2,576.3	2,486	4
Cactus seed.png: Lobstrosity drops Cactus seed with rarity 1/2,576.3 in quantity 1	Cactus seed	1	1/2,576.3	67	59
Kwuarm seed.png: Lobstrosity drops Kwuarm seed with rarity 1/3,435.1 in quantity 1	Kwuarm seed	1	1/3,435.1	3,820	6
Potato cactus seed.png: Lobstrosity drops Potato cactus seed with rarity 1/3,864.5 in quantity 1	Potato cactus seed	1	1/3,864.5	12	84
Snapdragon seed.png: Lobstrosity drops Snapdragon seed with rarity 1/6,183.2 in quantity 1	Snapdragon seed	1	1/6,183.2	41,659	36
Cadantine seed.png: Lobstrosity drops Cadantine seed with rarity 1/7,729 in quantity 1	Cadantine seed	1	1/7,729	3,987	4
Lantadyme seed.png: Lobstrosity drops Lantadyme seed with rarity 1/10,305.3 in quantity 1	Lantadyme seed	1	1/10,305.3	451	5
Dwarf weed seed.png: Lobstrosity drops Dwarf weed seed with rarity 1/15,458 in quantity 1	Dwarf weed seed	1	1/15,458	883	3
Torstol seed.png: Lobstrosity drops Torstol seed with rarity 1/30,916 in quantity 1	Torstol seed	1	1/30,916	6,381	42
Toadflax seed.png: Lobstrosity drops Toadflax seed with rarity 1/118.5 in quantity 1	Toadflax seed	1	1/118.5	1,406	6
Irit seed.png: Lobstrosity drops Irit seed with rarity 1/174.1 in quantity 1	Irit seed	1	1/174.1	63	3
Belladonna seed.png: Lobstrosity drops Belladonna seed with rarity 1/179.7 in quantity 1	Belladonna seed	1	1/179.7	175	106
Poison ivy seed.png: Lobstrosity drops Poison ivy seed with rarity 1/253.2 in quantity 1	Poison ivy seed	1	1/253.2	16	99
Avantoe seed.png: Lobstrosity drops Avantoe seed with rarity 1/253.2 in quantity 1	Avantoe seed	1	1/253.2	2,486	4
Cactus seed.png: Lobstrosity drops Cactus seed with rarity 1/265.2 in quantity 1	Cactus seed	1	1/265.2	67	59
Potato cactus seed.png: Lobstrosity drops Potato cactus seed with rarity 1/371.3 in quantity 1	Potato cactus seed	1	1/371.3	12	84
Kwuarm seed.png: Lobstrosity drops Kwuarm seed with rarity 1/371.3 in quantity 1	Kwuarm seed	1	1/371.3	3,820	6
Snapdragon seed.png: Lobstrosity drops Snapdragon seed with rarity 1/557 in quantity 1	Snapdragon seed	1	1/557	41,659	36
Cadantine seed.png: Lobstrosity drops Cadantine seed with rarity 1/795.7 in quantity 1	Cadantine seed	1	1/795.7	3,987	4
Lantadyme seed.png: Lobstrosity drops Lantadyme seed with rarity 1/1,113.9 in quantity 1	Lantadyme seed	1	1/1,113.9	451	5
Snape grass seed.png: Lobstrosity drops Snape grass seed with rarity 1/1,392.4 in quantity 3	Snape grass seed	3	1/1,392.4	22,698	168
Dwarf weed seed.png: Lobstrosity drops Dwarf weed seed with rarity 1/1,856.5 in quantity 1	Dwarf weed seed	1	1/1,856.5	883	3
Torstol seed.png: Lobstrosity drops Torstol seed with rarity 1/2,784.8 in quantity 1	Torstol seed	1	1/2,784.8	6,381	42

Other

Item	Quantity	Rarity	Price	High Alch
Coins	1,000	9/118	1,000	1,000
Pufferfish	1	8/118	Not sold	N/A
Giant seaweed	6 (noted)	8/118	1,248	6
Seaweed	6 (noted)	8/118	78	6
Toad's legs	2 (noted)	6/118	690	2
Caviar	2 (noted)	5/118	452	60
Oyster pearls	1	4/118	813	840

Gem drop table

There is a 3/118 chance of rolling the gem drop table.

Item	Quantity	Rarity	Price	High Alch
Nothing	N/A	1/78.81; Never^{[d 1]}	N/A	N/A
Uncut sapphire	1	1/157.33; 1/79.9^{[d 2]}	238	15
Uncut emerald	1	1/314.67; 1/159.79^{[d 2]}	463	30
Uncut ruby	1	1/629.33; 1/319.58^{[d 2]}	988	60
Nature talisman	1	1/1,678.22; 1/852.22^{[d 2]}	328	2
Uncut diamond	1	1/2,517.33; 1/1,278.33^{[d 2]}	2,142	120
Loop half of key	1	1/5,034.67; 1/2,556.67^{[d 2]}	11,919	60
Tooth half of key	1	1/5,034.67; 1/2,556.67^{[d 2]}	11,925	60
Rune javelin	5	1/5,034.67; 1/2,556.67^{[d 2]}	950	1,200
Rune spear	1	1/80,554.67; 1/4,793.75^{[d 2]}^{[d 3]}	11,871	12,480
Shield left half	1	1/161,109.33; 1/9,587.5^{[d 2]}^{[d 3]}	65,394	66,000
Dragon spear	1	1/214,812.44; 1/12,783.33^{[d 2]}^{[d 3]}	38,854	37,440

^ The "nothing" drop is removed while wearing a ring of wealth.
^ ^2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 The drop rate is increased while wearing a ring of wealth due to the "nothing" drop being removed.
^ ^3.0 ^3.1 ^3.2 Only dropped if Legends' Quest has been finished; if not, a talisman is dropped instead.

Tertiary

	Item	Quantity	Rarity	Price	High Alch
Numulite.png: Lobstrosity drops Numulite with rarity 45/175 in quantity 5-14	Numulite	5–14	45/175	200–560	150–420
	Unidentified small fossil	1	5/350	Not sold	60
	Unidentified medium fossil	1	5/700	Not sold	120
	Unidentified large fossil	1	5/875	Not sold	180
	Unidentified rare fossil	1	5/3,500	Not sold	750
	Clue scroll (easy)	1	1/128^{[d 1]}^[1]	Not sold	12

^ The easy clue scroll drop rate increases to 1/121 after unlocking the easy Combat Achievements rewards tier.

Changes

Date	Changes
[[{{#explode:12 July 2018\| \|0}} {{#explode:12 July 2018\| \|1}}]] [[{{#explode:12 July 2018\| \|2}}]] (update \| poll)	Lobstrosities now drop a maximum of 5 seaweed spores instead of 1.

Trivia

Lobstrosity could be a reference to The Dark Tower series by Stephen King where creatures of the same name appear in the second book, The Drawing of the Three.

References

^ Jagex. Mod Tide's Twitter account. 24 May 2019. Archived from the original on 24 May 2019. Mod Tide: "I know its been a while since the clue expansion but here is the information on clue scroll drop rates and loot chances! If anything changes I will keep you posted."

[1] The "nothing" drop is removed while wearing a ring of wealth.

[row-2] 2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 The drop rate is increased while wearing a ring of wealth due to the "nothing" drop being removed.

[rowm-3] 3.0 ^3.1 ^3.2 Only dropped if Legends' Quest has been finished; if not, a talisman is dropped instead.

[5] The easy clue scroll drop rate increases to 1/121 after unlocking the easy Combat Achievements rewards tier.

[Clue_rates_tweet-4] Jagex. Mod Tide's Twitter account. 24 May 2019. Archived from the original on 24 May 2019. Mod Tide: "I know its been a while since the clue expansion but here is the information on clue scroll drop rates and loot chances! If anything changes I will keep you posted."

[d 1]

[d 2]

[d 3]

[d 1]

[1]

Lobstrosity

Contents

Locations

Drops