Lobstrosity

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Lobstrosities are giant lobsters 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 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 by re-entering the area by using the rift or underground tunnel after receiving three random seaweed spores spawns increases the amount of random seaweed spores that spawns afterwards.

Locations[edit | edit source]

Location Levels Members Spawns Map
Underwater area of Fossil Island68Member icon.png9Maplink

Drops[edit | edit source]

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

100%[edit | edit source]

Item Quantity Rarity Price High Alch
Raw lobster.png: Lobstrosity drops Raw lobster with rarity Always in quantity 1Raw lobster1Always10242

Runes[edit | edit source]

Item Quantity Rarity Price High Alch
Water rune.png: Lobstrosity drops Water rune with rarity 8/118 in quantity 100Water rune1008/118500200
Chaos rune.png: Lobstrosity drops Chaos rune with rarity 8/118 in quantity 20Chaos rune208/1181,0201,080
Death rune.png: Lobstrosity drops Death rune with rarity 5/118 in quantity 10Death rune105/1182,1601,080
Nature rune.png: Lobstrosity drops Nature rune with rarity 6/118 in quantity 10Nature rune106/1182,1601,080

Noted herbs[edit | edit source]

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

Item Quantity Rarity Price High Alch
Grimy kwuarm.png: Lobstrosity drops Grimy kwuarm with rarity 2 × 15/944 in quantity 1 (noted)Grimy kwuarm(noted)2 × 15/9441,43212
Grimy cadantine.png: Lobstrosity drops Grimy cadantine with rarity 2 × 3/236 in quantity 1 (noted)Grimy cadantine(noted)2 × 3/2361,77913
Grimy lantadyme.png: Lobstrosity drops Grimy lantadyme with rarity 2 × 9/944 in quantity 1 (noted)Grimy lantadyme(noted)2 × 9/9441,54813
Grimy dwarf weed.png: Lobstrosity drops Grimy dwarf weed with rarity 2 × 3/326 in quantity 1 (noted)Grimy dwarf weed(noted)2 × 3/32691014

Un-noted herbs[edit | edit source]

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.png: Lobstrosity drops Grimy guam leaf with rarity 1/33.7 in quantity 1Grimy guam leaf11/33.7227
Grimy marrentill.png: Lobstrosity drops Grimy marrentill with rarity 1/45 in quantity 1Grimy marrentill11/45198
Grimy tarromin.png: Lobstrosity drops Grimy tarromin with rarity 1/59.9 in quantity 1Grimy tarromin11/59.91019
Grimy harralander.png: Lobstrosity drops Grimy harralander with rarity 1/77.1 in quantity 1Grimy harralander11/77.16849
Grimy ranarr weed.png: Lobstrosity drops Grimy ranarr weed with rarity 1/98.1 in quantity 1Grimy ranarr weed11/98.17,38818
Grimy irit leaf.png: Lobstrosity drops Grimy irit leaf with rarity 1/134.9 in quantity 1Grimy irit leaf11/134.972910
Grimy avantoe.png: Lobstrosity drops Grimy avantoe with rarity 1/179.8 in quantity 1Grimy avantoe11/179.81,56810
Grimy kwuarm.png: Lobstrosity drops Grimy kwuarm with rarity 1/215.8 in quantity 1Grimy kwuarm11/215.81,43212
Grimy cadantine.png: Lobstrosity drops Grimy cadantine with rarity 1/269.7 in quantity 1Grimy cadantine11/269.71,77913
Grimy lantadyme.png: Lobstrosity drops Grimy lantadyme with rarity 1/359.6 in quantity 1Grimy lantadyme11/359.61,54813
Grimy dwarf weed.png: Lobstrosity drops Grimy dwarf weed with rarity 1/359.6 in quantity 1Grimy dwarf weed11/359.691014

Seeds[edit | edit source]

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 5Seaweed spore56/1181,52560
Limpwurt seed.png: Lobstrosity drops Limpwurt seed with rarity 1/225.7 in quantity 1Limpwurt seed11/225.7257
Strawberry seed.png: Lobstrosity drops Strawberry seed with rarity 1/236 in quantity 1Strawberry seed11/236210
Marrentill seed.png: Lobstrosity drops Marrentill seed with rarity 1/247.3 in quantity 1Marrentill seed11/247.381
Jangerberry seed.png: Lobstrosity drops Jangerberry seed with rarity 1/336 in quantity 1Jangerberry seed11/336136
Tarromin seed.png: Lobstrosity drops Tarromin seed with rarity 1/363.7 in quantity 1Tarromin seed11/363.7111
Wildblood seed.png: Lobstrosity drops Wildblood seed with rarity 1/372.5 in quantity 1Wildblood seed11/372.51728
Watermelon seed.png: Lobstrosity drops Watermelon seed with rarity 1/490.7 in quantity 1Watermelon seed11/490.71533
Harralander seed.png: Lobstrosity drops Harralander seed with rarity 1/552.1 in quantity 1Harralander seed11/552.1232
Snape grass seed.png: Lobstrosity drops Snape grass seed with rarity 1/772.9 in quantity 1Snape grass seed11/772.92,77056
Ranarr seed.png: Lobstrosity drops Ranarr seed with rarity 1/792.7 in quantity 1Ranarr seed11/792.745,94230
Whiteberry seed.png: Lobstrosity drops Whiteberry seed with rarity 1/909.3 in quantity 1Whiteberry seed11/909.3479
Mushroom spore.png: Lobstrosity drops Mushroom spore with rarity 1/1,066.1 in quantity 1Mushroom spore11/1,066.111351
Toadflax seed.png: Lobstrosity drops Toadflax seed with rarity 1/1,145 in quantity 1Toadflax seed11/1,1451,9036
Belladonna seed.png: Lobstrosity drops Belladonna seed with rarity 1/1,717.6 in quantity 1Belladonna seed11/1,717.671106
Irit seed.png: Lobstrosity drops Irit seed with rarity 1/1,717.6 in quantity 1Irit seed11/1,717.6373
Poison ivy seed.png: Lobstrosity drops Poison ivy seed with rarity 1/2,378.2 in quantity 1Poison ivy seed11/2,378.21099
Avantoe seed.png: Lobstrosity drops Avantoe seed with rarity 1/2,576.3 in quantity 1Avantoe seed11/2,576.33124
Cactus seed.png: Lobstrosity drops Cactus seed with rarity 1/2,576.3 in quantity 1Cactus seed11/2,576.34759
Kwuarm seed.png: Lobstrosity drops Kwuarm seed with rarity 1/3,435.1 in quantity 1Kwuarm seed11/3,435.12836
Potato cactus seed.png: Lobstrosity drops Potato cactus seed with rarity 1/3,864.5 in quantity 1Potato cactus seed11/3,864.5984
Snapdragon seed.png: Lobstrosity drops Snapdragon seed with rarity 1/6,183.2 in quantity 1Snapdragon seed11/6,183.255,81336
Cadantine seed.png: Lobstrosity drops Cadantine seed with rarity 1/7,729 in quantity 1Cadantine seed11/7,7295724
Lantadyme seed.png: Lobstrosity drops Lantadyme seed with rarity 1/10,305.3 in quantity 1Lantadyme seed11/10,305.35145
Dwarf weed seed.png: Lobstrosity drops Dwarf weed seed with rarity 1/15,458 in quantity 1Dwarf weed seed11/15,4583223
Torstol seed.png: Lobstrosity drops Torstol seed with rarity 1/30,916 in quantity 1Torstol seed11/30,91649,96042
Toadflax seed.png: Lobstrosity drops Toadflax seed with rarity 1/118.5 in quantity 1Toadflax seed11/118.51,9036
Irit seed.png: Lobstrosity drops Irit seed with rarity 1/174.1 in quantity 1Irit seed11/174.1373
Belladonna seed.png: Lobstrosity drops Belladonna seed with rarity 1/179.7 in quantity 1Belladonna seed11/179.771106
Poison ivy seed.png: Lobstrosity drops Poison ivy seed with rarity 1/253.2 in quantity 1Poison ivy seed11/253.21099
Avantoe seed.png: Lobstrosity drops Avantoe seed with rarity 1/253.2 in quantity 1Avantoe seed11/253.23124
Cactus seed.png: Lobstrosity drops Cactus seed with rarity 1/265.2 in quantity 1Cactus seed11/265.24759
Potato cactus seed.png: Lobstrosity drops Potato cactus seed with rarity 1/371.3 in quantity 1Potato cactus seed11/371.3984
Kwuarm seed.png: Lobstrosity drops Kwuarm seed with rarity 1/371.3 in quantity 1Kwuarm seed11/371.32836
Snapdragon seed.png: Lobstrosity drops Snapdragon seed with rarity 1/557 in quantity 1Snapdragon seed11/55755,81336
Cadantine seed.png: Lobstrosity drops Cadantine seed with rarity 1/795.7 in quantity 1Cadantine seed11/795.75724
Lantadyme seed.png: Lobstrosity drops Lantadyme seed with rarity 1/1,113.9 in quantity 1Lantadyme seed11/1,113.95145
Snape grass seed.png: Lobstrosity drops Snape grass seed with rarity 1/1,392.4 in quantity 3Snape grass seed31/1,392.48,310168
Dwarf weed seed.png: Lobstrosity drops Dwarf weed seed with rarity 1/1,856.5 in quantity 1Dwarf weed seed11/1,856.53223
Torstol seed.png: Lobstrosity drops Torstol seed with rarity 1/2,784.8 in quantity 1Torstol seed11/2,784.849,96042

Other[edit | edit source]

Item Quantity Rarity Price High Alch
Coins_1000.png: Lobstrosity drops Coins with rarity 9/118 in quantity 1000Coins1,0009/1181,0001,000
Pufferfish.png: Lobstrosity drops Pufferfish with rarity 8/118 in quantity 1Pufferfish18/118Not sold138
Giant seaweed.png: Lobstrosity drops Giant seaweed with rarity 8/118 in quantity 6 (noted)Giant seaweed(noted)8/1189486
Seaweed.png: Lobstrosity drops Seaweed with rarity 8/118 in quantity 6 (noted)Seaweed(noted)8/118486
Toad's legs.png: Lobstrosity drops Toad's legs with rarity 6/118 in quantity 2 (noted)Toad's legs(noted)6/1181,0782
Caviar.png: Lobstrosity drops Caviar with rarity 5/118 in quantity 2 (noted)Caviar(noted)5/11842860
Oyster pearls.png: Lobstrosity drops Oyster pearls with rarity 4/118 in quantity 1Oyster pearls14/118860840

Gem drop table[edit | edit source]

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

Item Quantity Rarity Price High Alch
This does not exist.NothingN/A1/78.81; Never[d 1]N/AN/A
Uncut sapphire.png: Lobstrosity drops Uncut sapphire with rarity 1/157.33 in quantity 1Uncut sapphire11/157.33; 1/79.9[d 2]32415
Uncut emerald.png: Lobstrosity drops Uncut emerald with rarity 1/314.67 in quantity 1Uncut emerald11/314.67; 1/159.79[d 2]57030
Uncut ruby.png: Lobstrosity drops Uncut ruby with rarity 1/629.33 in quantity 1Uncut ruby11/629.33; 1/319.58[d 2]1,16760
Nature talisman.png: Lobstrosity drops Nature talisman with rarity 1/1,678.22 in quantity 1Nature talisman11/1,678.22; 1/852.22[d 2]1,0032
Uncut diamond.png: Lobstrosity drops Uncut diamond with rarity 1/2,517.33 in quantity 1Uncut diamond11/2,517.33; 1/1,278.33[d 2]2,686120
Loop half of key.png: Lobstrosity drops Loop half of key with rarity 1/5,034.67 in quantity 1Loop half of key11/5,034.67; 1/2,556.67[d 2]10,27160
Tooth half of key.png: Lobstrosity drops Tooth half of key with rarity 1/5,034.67 in quantity 1Tooth half of key11/5,034.67; 1/2,556.67[d 2]10,54960
Rune javelin.png: Lobstrosity drops Rune javelin with rarity 1/5,034.67 in quantity 5Rune javelin51/5,034.67; 1/2,556.67[d 2]8051,200
Rune spear.png: Lobstrosity drops Rune spear with rarity 1/80,554.67 in quantity 1Rune spear11/80,554.67; 1/4,793.75[d 2][d 3]11,82612,480
Shield left half.png: Lobstrosity drops Shield left half with rarity 1/161,109.33 in quantity 1Shield left half11/161,109.33; 1/9,587.5[d 2][d 3]65,13366,000
Dragon spear.png: Lobstrosity drops Dragon spear with rarity 1/214,812.44 in quantity 1Dragon spear11/214,812.44; 1/12,783.33[d 2][d 3]37,23737,440
  1. The "nothing" drop is removed while wearing a ring of wealth.
  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.
  3. 3.0 3.1 3.2 Only dropped if Legends' Quest has been finished; if not, a talisman is dropped instead.

Tertiary[edit | edit source]

Item Quantity Rarity Price High Alch
Numulite.png: Lobstrosity drops Numulite with rarity 9/35 in quantity 5-14Numulite5–149/35115–322150–420
Unidentified small fossil.png: Lobstrosity drops Unidentified small fossil with rarity 1/70 in quantity 1Unidentified small fossil11/70Not sold60
Unidentified medium fossil.png: Lobstrosity drops Unidentified medium fossil with rarity 1/140 in quantity 1Unidentified medium fossil11/140Not sold120
Unidentified large fossil.png: Lobstrosity drops Unidentified large fossil with rarity 1/175 in quantity 1Unidentified large fossil11/175Not sold180
Unidentified rare fossil.png: Lobstrosity drops Unidentified rare fossil with rarity 1/700 in quantity 1Unidentified rare fossil11/700Not sold750
Clue scroll (easy).png: Lobstrosity drops Clue scroll (easy) with rarity 1/128 in quantity 1Clue scroll (easy)11/128[d 1][1]Not sold12
  1. The easy clue scroll drop rate increases to 1/121 with the completion of the easy combat achievements.

Changes[edit | edit source]

Date Changes
12 July 2018
(update | poll)

Lobstrosities now drop a maximum of 5 seaweed spores instead of 1.

Trivia[edit | edit source]

References[edit | edit source]

  1. 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."