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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 214

Runes

Item Quantity Rarity GE market price
Water rune Water rune 100 Common 500
Chaos rune Chaos rune 20 Uncommon 1,980
Nature rune Nature rune 10 Uncommon 2,120
Death rune Death rune 10 Uncommon 2,310

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 783–3,915
Limpwurt seed 5 Limpwurt seed 1 Uncommon 57
Strawberry seed 5 Strawberry seed 1 Uncommon 21
Herb seed 5 Marrentill seed 1 Uncommon 5
Jangerberry seed 5 Jangerberry seed 1 Uncommon 3
Herb seed 5 Tarromin seed 1 Uncommon 4
Wildblood seed 5 Wildblood seed 1 Uncommon 56
Watermelon seed 5 Watermelon seed 1 Rare 160
Herb seed 5 Harralander seed 1 Rare 24
Herb seed 5 Ranarr seed 1 Rare 39,338
Whiteberry seed 5 Whiteberry seed 1 Rare 9
Mushroom spore 5 Mushroom spore 1 Rare 16
Herb seed 5 Toadflax seed 1 Rare 385
Herb seed 5 Irit seed 1 Rare 41
Belladonna seed 5 Belladonna seed 1 Rare 22
Poison ivy seed 5 Poison ivy seed 1 Rare 48
Cactus seed 5 Cactus seed 1 Rare 39
Herb seed 5 Avantoe seed 1 Rare 889
Herb seed 5 Kwuarm seed 1 Rare 470
Herb seed 5 Snapdragon seed 1 Very rare 50,174
Herb seed 5 Cadantine seed 1 Very rare 1,250
Herb seed 5 Lantadyme seed 1 Very rare 1,725
Herb seed 5 Dwarf weed seed 1 Very rare 997
Herb seed 5 Torstol seed 1 Very rare 57,146

Herbs

The herbs dropped vary between noted and unnoted.

Item Quantity Rarity GE market price
Grimy guam leaf Grimy guam leaf 1 Common 21
Grimy marrentill Grimy marrentill 1 Common 14
Grimy tarromin Grimy tarromin 1 Common 153
Grimy harralander Grimy harralander 1 Uncommon 810
Grimy ranarr weed Grimy ranarr weed 1 Uncommon 7,294
Grimy irit leaf Grimy irit leaf 1 Uncommon 820
Grimy avantoe Grimy avantoe 1 Uncommon 1,471
Grimy kwuarm Grimy kwuarm 1 Uncommon 1,051
Grimy cadantine Grimy cadantine 1 Uncommon 1,166
Grimy lantadyme Grimy lantadyme 1 Uncommon 1,081
Grimy dwarf weed Grimy dwarf weed 1 Uncommon 581

Other

Item Quantity Rarity GE market price
Numulite 25 Numulite 5–14 Common (9/35; 26%) 80–224
Coins 1000 Coins 1,000 Common Not sold
Pufferfish Pufferfish 1 Common Not sold
Seaweed Seaweed 6 (noted) Uncommon 360
Giant seaweed Giant seaweed 6 (noted) Uncommon 3,648
Toad's legs Toad's legs 2 (noted) Uncommon 1,212
Caviar Caviar 2 (noted) Uncommon 334
Oyster pearls Oyster pearls 1 Uncommon 684
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 654
Uncut emerald Uncut emerald 1 Rare 859
Uncut ruby Uncut ruby 1 Rare 1,491
Nature talisman Nature talisman 1 Very rare 1,087
Uncut diamond Uncut diamond 1 Very rare 2,905
Rune javelin Rune javelin 5 Very rare 815
Loop half of key Loop half of key 1 Very rare 9,490
Tooth half of key Tooth half of key 1 Very rare 11,839
Rune spear Rune spear 1 Very rare 12,081
Shield left half Shield left half 1 Very rare 65,708
Dragon spear Dragon spear 1 Very rare 38,162


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.