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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 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.

Drops

100%

Item Quantity Rarity GE market price
Raw lobster Raw lobster 1 Always 142

Runes

Item Quantity Rarity GE market price
Water rune Water rune 100 Common 400
Chaos rune Chaos rune 20 Uncommon 1,240
Nature rune Nature rune 10 Uncommon 2,540
Death rune Death rune 10 Uncommon 2,010

Seeds

This monsters drops seeds from the allotment seed drop table.

Item Quantity Rarity GE market price
Seaweed spore 5 Seaweed spore 1–5 Uncommon 639–3,195
Limpwurt seed 5 Limpwurt seed 1 Uncommon 48
Strawberry seed 5 Strawberry seed 1 Uncommon 12
Herb seed 5 Marrentill seed 1 Uncommon 3
Jangerberry seed 5 Jangerberry seed 1 Uncommon 5
Herb seed 5 Tarromin seed 1 Uncommon 12
Wildblood seed 5 Wildblood seed 1 Uncommon 32
Watermelon seed 5 Watermelon seed 1 Rare 45
Herb seed 5 Harralander seed 1 Rare 20
Herb seed 5 Ranarr seed 1 Rare 40,908
Whiteberry seed 5 Whiteberry seed 1 Rare 8
Mushroom spore 5 Mushroom spore 1 Rare 36
Herb seed 5 Toadflax seed 1 Rare 658
Herb seed 5 Irit seed 1 Rare 52
Belladonna seed 5 Belladonna seed 1 Rare 37
Poison ivy seed 5 Poison ivy seed 1 Rare 22
Cactus seed 5 Cactus seed 1 Rare 71
Herb seed 5 Avantoe seed 1 Rare 574
Herb seed 5 Kwuarm seed 1 Rare 219
Herb seed 5 Snapdragon seed 1 Very rare 60,275
Herb seed 5 Cadantine seed 1 Very rare 836
Herb seed 5 Lantadyme seed 1 Very rare 1,531
Herb seed 5 Dwarf weed seed 1 Very rare 549
Herb seed 5 Torstol seed 1 Very rare 52,426

Herbs

The herbs dropped vary between noted and unnoted.

Item Quantity Rarity GE market price
Grimy guam leaf Grimy guam leaf 1 Common 11
Grimy marrentill Grimy marrentill 1 Common 14
Grimy tarromin Grimy tarromin 1 Common 144
Grimy harralander Grimy harralander 1 Uncommon 614
Grimy ranarr weed Grimy ranarr weed 1 Uncommon 7,793
Grimy irit leaf Grimy irit leaf 1 Uncommon 901
Grimy avantoe Grimy avantoe 1 Uncommon 1,982
Grimy kwuarm Grimy kwuarm 1 Uncommon 1,329
Grimy cadantine Grimy cadantine 1 Uncommon 1,689
Grimy lantadyme Grimy lantadyme 1 Uncommon 1,663
Grimy dwarf weed Grimy dwarf weed 1 Uncommon 516

Other

Item Quantity Rarity GE market price
Numulite 25 Numulite 5–14 Common (9/35; 26%) 95–266
Coins 1000 Coins 1,000 Common Not sold
Pufferfish Pufferfish 1 Common Not sold
Seaweed Seaweed 6 (noted) Uncommon 270
Giant seaweed Giant seaweed 6 (noted) Uncommon 3,918
Toad's legs Toad's legs 2 (noted) Uncommon 1,164
Caviar Caviar 2 (noted) Uncommon 306
Oyster pearls Oyster pearls 1 Uncommon 629
Unidentified small fossil Unidentified small fossil 1 Uncommon (1/70=1.4%) Not sold
Unidentified medium fossil Unidentified medium fossil 1 Rare (1/140=0.71%) Not sold
Unidentified large fossil Unidentified large fossil 1 Rare (1/175=0.57%) Not sold
Unidentified rare fossil Unidentified rare fossil 1 Rare (1/700=0.14%) Not sold
Clue scroll (easy) Clue scroll (easy) 1 Rare Not sold

Gem drop table

In addition to the drops above, this monster has access to the gem drop table.

Show/hide gem drop table
Item Quantity Rarity GE market price
Uncut sapphire Uncut sapphire 1 Rare 466
Uncut emerald Uncut emerald 1 Rare 692
Uncut ruby Uncut ruby 1 Rare 1,325
Nature talisman Nature talisman 1 Very rare 723
Uncut diamond Uncut diamond 1 Very rare 2,910
Rune javelin Rune javelin 5 Very rare 885
Loop half of key Loop half of key 1 Very rare 10,161
Tooth half of key Tooth half of key 1 Very rare 9,827
Rune spear Rune spear 1 Very rare 11,905
Shield left half Shield left half 1 Very rare 65,541
Dragon spear Dragon spear 1 Very rare 37,351


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.
  • Upon release, lobstrosities only dropped a maximum of 1 seaweed spore. This was increased to 5 in an update on 12 July 2018.

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