Lobstrosity

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Lobstrosities are giant lobsters located in the southeast 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.

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.

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 lobster1Always21942

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 rune208/1181,3201,080
Death rune.png: Lobstrosity drops Death rune with rarity 5/118 in quantity 10Death rune105/1181,9301,080
Nature rune.png: Lobstrosity drops Nature rune with rarity 6/118 in quantity 10Nature rune106/1181,9801,080

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 × 15/9441,18612
Grimy cadantine.png: Lobstrosity drops Grimy cadantine with rarity 2 × 3/236 in quantity 1 (noted)Grimy cadantine(noted)2 × 3/2361,28413
Grimy lantadyme.png: Lobstrosity drops Grimy lantadyme with rarity 2 × 9/944 in quantity 1 (noted)Grimy lantadyme(noted)2 × 9/9441,42513
Grimy dwarf weed.png: Lobstrosity drops Grimy dwarf weed with rarity 2 × 3/326 in quantity 1 (noted)Grimy dwarf weed(noted)2 × 3/32643414

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 leaf11/33.7137
Grimy marrentill.png: Lobstrosity drops Grimy marrentill with rarity 1/45 in quantity 1Grimy marrentill11/45148
Grimy tarromin.png: Lobstrosity drops Grimy tarromin with rarity 1/59.9 in quantity 1Grimy tarromin11/59.91209
Grimy harralander.png: Lobstrosity drops Grimy harralander with rarity 1/77.1 in quantity 1Grimy harralander11/77.16079
Grimy ranarr weed.png: Lobstrosity drops Grimy ranarr weed with rarity 1/98.1 in quantity 1Grimy ranarr weed11/98.17,07418
Grimy irit leaf.png: Lobstrosity drops Grimy irit leaf with rarity 1/134.9 in quantity 1Grimy irit leaf11/134.974510
Grimy avantoe.png: Lobstrosity drops Grimy avantoe with rarity 1/179.8 in quantity 1Grimy avantoe11/179.81,65010
Grimy kwuarm.png: Lobstrosity drops Grimy kwuarm with rarity 1/215.8 in quantity 1Grimy kwuarm11/215.81,18612
Grimy cadantine.png: Lobstrosity drops Grimy cadantine with rarity 1/269.7 in quantity 1Grimy cadantine11/269.71,28413
Grimy lantadyme.png: Lobstrosity drops Grimy lantadyme with rarity 1/359.6 in quantity 1Grimy lantadyme11/359.61,42513
Grimy dwarf weed.png: Lobstrosity drops Grimy dwarf weed with rarity 1/359.6 in quantity 1Grimy dwarf weed11/359.643414

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 spore56/1184,49560
Limpwurt seed.png: Lobstrosity drops Limpwurt seed with rarity 1/225.7 in quantity 1Limpwurt seed11/225.7297
Strawberry seed.png: Lobstrosity drops Strawberry seed with rarity 1/236 in quantity 1Strawberry seed11/236610
Marrentill seed.png: Lobstrosity drops Marrentill seed with rarity 1/247.3 in quantity 1Marrentill seed11/247.391
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 seed11/363.781
Wildblood seed.png: Lobstrosity drops Wildblood seed with rarity 1/372.5 in quantity 1Wildblood seed11/372.5518
Watermelon seed.png: Lobstrosity drops Watermelon seed with rarity 1/490.7 in quantity 1Watermelon seed11/490.74333
Harralander seed.png: Lobstrosity drops Harralander seed with rarity 1/552.1 in quantity 1Harralander seed11/552.1272
Snape grass seed.png: Lobstrosity drops Snape grass seed with rarity 1/772.9 in quantity 1Snape grass seed11/772.92,49456
Ranarr seed.png: Lobstrosity drops Ranarr seed with rarity 1/792.7 in quantity 1Ranarr seed11/792.739,06930
Whiteberry seed.png: Lobstrosity drops Whiteberry seed with rarity 1/909.3 in quantity 1Whiteberry seed11/909.3879
Mushroom spore.png: Lobstrosity drops Mushroom spore with rarity 1/1,066.1 in quantity 1Mushroom spore11/1,066.13751
Toadflax seed.png: Lobstrosity drops Toadflax seed with rarity 1/1,145 in quantity 1Toadflax seed11/1,1457526
Belladonna seed.png: Lobstrosity drops Belladonna seed with rarity 1/1,717.6 in quantity 1Belladonna seed11/1,717.644106
Irit seed.png: Lobstrosity drops Irit seed with rarity 1/1,717.6 in quantity 1Irit seed11/1,717.6523
Poison ivy seed.png: Lobstrosity drops Poison ivy seed with rarity 1/2,378.2 in quantity 1Poison ivy seed11/2,378.21699
Avantoe seed.png: Lobstrosity drops Avantoe seed with rarity 1/2,576.3 in quantity 1Avantoe seed11/2,576.38544
Cactus seed.png: Lobstrosity drops Cactus seed with rarity 1/2,576.3 in quantity 1Cactus seed11/2,576.39959
Kwuarm seed.png: Lobstrosity drops Kwuarm seed with rarity 1/3,435.1 in quantity 1Kwuarm seed11/3,435.12446
Potato cactus seed.png: Lobstrosity drops Potato cactus seed with rarity 1/3,864.5 in quantity 1Potato cactus seed11/3,864.54184
Snapdragon seed.png: Lobstrosity drops Snapdragon seed with rarity 1/6,183.2 in quantity 1Snapdragon seed11/6,183.251,50936
Cadantine seed.png: Lobstrosity drops Cadantine seed with rarity 1/7,729 in quantity 1Cadantine seed11/7,7297524
Lantadyme seed.png: Lobstrosity drops Lantadyme seed with rarity 1/10,305.3 in quantity 1Lantadyme seed11/10,305.31,8855
Dwarf weed seed.png: Lobstrosity drops Dwarf weed seed with rarity 1/15,458 in quantity 1Dwarf weed seed11/15,4583493
Torstol seed.png: Lobstrosity drops Torstol seed with rarity 1/30,916 in quantity 1Torstol seed11/30,91658,23342
Toadflax seed.png: Lobstrosity drops Toadflax seed with rarity 1/118.5 in quantity 1Toadflax seed11/118.57526
Irit seed.png: Lobstrosity drops Irit seed with rarity 1/174.1 in quantity 1Irit seed11/174.1523
Belladonna seed.png: Lobstrosity drops Belladonna seed with rarity 1/179.7 in quantity 1Belladonna seed11/179.744106
Poison ivy seed.png: Lobstrosity drops Poison ivy seed with rarity 1/253.2 in quantity 1Poison ivy seed11/253.21699
Avantoe seed.png: Lobstrosity drops Avantoe seed with rarity 1/253.2 in quantity 1Avantoe seed11/253.28544
Cactus seed.png: Lobstrosity drops Cactus seed with rarity 1/265.2 in quantity 1Cactus seed11/265.29959
Potato cactus seed.png: Lobstrosity drops Potato cactus seed with rarity 1/371.3 in quantity 1Potato cactus seed11/371.34184
Kwuarm seed.png: Lobstrosity drops Kwuarm seed with rarity 1/371.3 in quantity 1Kwuarm seed11/371.32446
Snapdragon seed.png: Lobstrosity drops Snapdragon seed with rarity 1/557 in quantity 1Snapdragon seed11/55751,50936
Cadantine seed.png: Lobstrosity drops Cadantine seed with rarity 1/795.7 in quantity 1Cadantine seed11/795.77524
Lantadyme seed.png: Lobstrosity drops Lantadyme seed with rarity 1/1,113.9 in quantity 1Lantadyme seed11/1,113.91,8855
Snape grass seed.png: Lobstrosity drops Snape grass seed with rarity 1/1,392.4 in quantity 3Snape grass seed31/1,392.47,482168
Dwarf weed seed.png: Lobstrosity drops Dwarf weed seed with rarity 1/1,856.5 in quantity 1Dwarf weed seed11/1,856.53493
Torstol seed.png: Lobstrosity drops Torstol seed with rarity 1/2,784.8 in quantity 1Torstol seed11/2,784.858,23342

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)8/1182,5506
Seaweed.png: Lobstrosity drops Seaweed with rarity 8/118 in quantity 6 (noted)Seaweed(noted)8/1182706
Toad's legs.png: Lobstrosity drops Toad's legs with rarity 6/118 in quantity 2 (noted)Toad's legs(noted)6/1188642
Caviar.png: Lobstrosity drops Caviar with rarity 5/118 in quantity 2 (noted)Caviar(noted)5/11867460
Oyster pearls.png: Lobstrosity drops Oyster pearls with rarity 4/118 in quantity 1Oyster pearls14/118712840

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]41315
Uncut emerald.png: Lobstrosity drops Uncut emerald with rarity 1/314.67 in quantity 1Uncut emerald11/314.67; 1/159.79[d 2]61030
Uncut ruby.png: Lobstrosity drops Uncut ruby with rarity 1/629.33 in quantity 1Uncut ruby11/629.33; 1/319.58[d 2]1,16560
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]8562
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]2,283120
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]10,26660
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]10,50060
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]8951,200
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]11,89512,480
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]65,73966,000
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]37,33637,440
  1. The nothing drop is removed when 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 of this item is increased when wearing a ring of wealth.
  3. 3.0 3.1 3.2 The rune spear, shield left half and dragon spear will only be dropped if Legends' Quest has been finished, or else a talisman will be dropped as a replacement.

Tertiary[edit | edit source]

Item Quantity Rarity Price High Alch
Numulite.png: Lobstrosity drops Numulite with rarity 9/35 in quantity 5-14Numulite5–149/35110-308150-420
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[1]Not sold12

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."