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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 161

Runes

Item Quantity Rarity GE market price
Water rune Water rune 100 Common 500
Chaos rune Chaos rune 20 Uncommon 1,740
Nature rune Nature rune 10 Uncommon 2,860
Death rune Death rune 10 Uncommon 2,430

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 661–3,305
Limpwurt seed 5 Limpwurt seed 1 Uncommon 38
Strawberry seed 5 Strawberry seed 1 Uncommon 8
Herb seed 5 Marrentill seed 1 Uncommon 4
Jangerberry seed 5 Jangerberry seed 1 Uncommon 7
Herb seed 5 Tarromin seed 1 Uncommon 17
Wildblood seed 5 Wildblood seed 1 Uncommon 104
Watermelon seed 5 Watermelon seed 1 Rare 90
Herb seed 5 Harralander seed 1 Rare 27
Herb seed 5 Ranarr seed 1 Rare 71,054
Whiteberry seed 5 Whiteberry seed 1 Rare 9
Mushroom spore 5 Mushroom spore 1 Rare 32
Herb seed 5 Toadflax seed 1 Rare 917
Herb seed 5 Irit seed 1 Rare 48
Belladonna seed 5 Belladonna seed 1 Rare 39
Poison ivy seed 5 Poison ivy seed 1 Rare 20
Cactus seed 5 Cactus seed 1 Rare 52
Herb seed 5 Avantoe seed 1 Rare 709
Herb seed 5 Kwuarm seed 1 Rare 371
Herb seed 5 Snapdragon seed 1 Very rare 85,782
Herb seed 5 Cadantine seed 1 Very rare 981
Herb seed 5 Lantadyme seed 1 Very rare 1,689
Herb seed 5 Dwarf weed seed 1 Very rare 386
Herb seed 5 Torstol seed 1 Very rare 56,851

Herbs

The herbs dropped vary between noted and unnoted.

Item Quantity Rarity GE market price
Grimy guam leaf Grimy guam leaf 1 Common 10
Grimy marrentill Grimy marrentill 1 Common 11
Grimy tarromin Grimy tarromin 1 Common 110
Grimy harralander Grimy harralander 1 Uncommon 550
Grimy ranarr weed Grimy ranarr weed 1 Uncommon 10,305
Grimy irit leaf Grimy irit leaf 1 Uncommon 845
Grimy avantoe Grimy avantoe 1 Uncommon 1,702
Grimy kwuarm Grimy kwuarm 1 Uncommon 1,312
Grimy cadantine Grimy cadantine 1 Uncommon 1,473
Grimy lantadyme Grimy lantadyme 1 Uncommon 1,383
Grimy dwarf weed Grimy dwarf weed 1 Uncommon 512

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 234
Giant seaweed Giant seaweed 6 (noted) Uncommon 3,414
Toad's legs Toad's legs 2 (noted) Uncommon 1,230
Caviar Caviar 2 (noted) Uncommon 270
Oyster pearls Oyster pearls 1 Uncommon 616
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 445
Uncut emerald Uncut emerald 1 Rare 676
Uncut ruby Uncut ruby 1 Rare 1,312
Nature talisman Nature talisman 1 Very rare 1,233
Uncut diamond Uncut diamond 1 Very rare 2,733
Rune javelin Rune javelin 5 Very rare 615
Loop half of key Loop half of key 1 Very rare 9,855
Tooth half of key Tooth half of key 1 Very rare 9,529
Rune spear Rune spear 1 Very rare 11,966
Shield left half Shield left half 1 Very rare 65,573
Dragon spear Dragon spear 1 Very rare 37,805


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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