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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 216

Runes

Item Quantity Rarity GE market price
Water rune Water rune 100 Common 500
Chaos rune Chaos rune 20 Uncommon 2,040
Nature rune Nature rune 10 Uncommon 2,470
Death rune Death rune 10 Uncommon 2,870

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 730–3,650
Limpwurt seed 5 Limpwurt seed 1 Uncommon 116
Strawberry seed 5 Strawberry seed 1 Uncommon 26
Herb seed 5 Marrentill seed 1 Uncommon 24
Jangerberry seed 5 Jangerberry seed 1 Uncommon 1
Herb seed 5 Tarromin seed 1 Uncommon 22
Wildblood seed 5 Wildblood seed 1 Uncommon 218
Watermelon seed 5 Watermelon seed 1 Rare 263
Herb seed 5 Harralander seed 1 Rare 46
Herb seed 5 Ranarr seed 1 Rare 43,023
Whiteberry seed 5 Whiteberry seed 1 Rare 41
Mushroom spore 5 Mushroom spore 1 Rare 38
Herb seed 5 Toadflax seed 1 Rare 1,380
Herb seed 5 Irit seed 1 Rare 95
Belladonna seed 5 Belladonna seed 1 Rare 44
Poison ivy seed 5 Poison ivy seed 1 Rare 336
Cactus seed 5 Cactus seed 1 Rare 194
Herb seed 5 Avantoe seed 1 Rare 2,077
Herb seed 5 Kwuarm seed 1 Rare 871
Herb seed 5 Snapdragon seed 1 Very rare 49,893
Herb seed 5 Cadantine seed 1 Very rare 1,138
Herb seed 5 Lantadyme seed 1 Very rare 1,658
Herb seed 5 Dwarf weed seed 1 Very rare 1,215
Herb seed 5 Torstol seed 1 Very rare 73,806

Herbs

The herbs dropped vary between noted and unnoted.

Item Quantity Rarity GE market price
Grimy guam leaf Grimy guam leaf 1 Common 17
Grimy marrentill Grimy marrentill 1 Common 15
Grimy tarromin Grimy tarromin 1 Common 163
Grimy harralander Grimy harralander 1 Uncommon 830
Grimy ranarr weed Grimy ranarr weed 1 Uncommon 8,238
Grimy irit leaf Grimy irit leaf 1 Uncommon 923
Grimy avantoe Grimy avantoe 1 Uncommon 2,091
Grimy kwuarm Grimy kwuarm 1 Uncommon 1,607
Grimy cadantine Grimy cadantine 1 Uncommon 1,409
Grimy lantadyme Grimy lantadyme 1 Uncommon 1,328
Grimy dwarf weed Grimy dwarf weed 1 Uncommon 1,018

Other

Item Quantity Rarity GE market price
Numulite 25 Numulite 5–14 Common (9/35; 26%) 65–182
Coins 1000 Coins 1,000 Common Not sold
Pufferfish Pufferfish 1 Common Not sold
Seaweed Seaweed 6 (noted) Uncommon 504
Giant seaweed Giant seaweed 6 (noted) Uncommon 4,440
Toad's legs Toad's legs 2 (noted) Uncommon 892
Caviar Caviar 2 (noted) Uncommon 416
Oyster pearls Oyster pearls 1 Uncommon 779
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 986
Uncut emerald Uncut emerald 1 Rare 994
Uncut ruby Uncut ruby 1 Rare 1,772
Nature talisman Nature talisman 1 Very rare 734
Uncut diamond Uncut diamond 1 Very rare 3,735
Rune javelin Rune javelin 5 Very rare 760
Loop half of key Loop half of key 1 Very rare 8,703
Tooth half of key Tooth half of key 1 Very rare 13,676
Rune spear Rune spear 1 Very rare 12,168
Shield left half Shield left half 1 Very rare 65,488
Dragon spear Dragon spear 1 Very rare 37,843


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.