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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 210

Runes[]

Item Quantity Rarity GE market price
Water rune Water rune 100 Common 400
Chaos rune Chaos rune 20 Uncommon 1,780
Nature rune Nature rune 10 Uncommon 2,170
Death rune Death rune 10 Uncommon 2,030

Seeds[]

This monsters drops seeds from the allotment seed drop table.

Item Quantity Rarity GE market price
Seaweed spore Seaweed spore 1–5 Uncommon 964–4,820
Limpwurt seed Limpwurt seed 1 Uncommon 30
Strawberry seed Strawberry seed 1 Uncommon 5
Marrentill seed Marrentill seed 1 Uncommon 5
Jangerberry seed Jangerberry seed 1 Uncommon 2
Tarromin seed Tarromin seed 1 Uncommon 10
Wildblood seed Wildblood seed 1 Uncommon 53
Watermelon seed Watermelon seed 1 Rare 71
Harralander seed Harralander seed 1 Rare 31
Ranarr seed Ranarr seed 1 Rare 45,466
Whiteberry seed Whiteberry seed 1 Rare 4
Mushroom spore Mushroom spore 1 Rare 67
Toadflax seed Toadflax seed 1 Rare 795
Irit seed Irit seed 1 Rare 47
Belladonna seed Belladonna seed 1 Rare 57
Poison ivy seed Poison ivy seed 1 Rare 18
Cactus seed Cactus seed 1 Rare 98
Avantoe seed Avantoe seed 1 Rare 1,675
Kwuarm seed Kwuarm seed 1 Rare 379
Snapdragon seed Snapdragon seed 1 Very rare 54,551
Cadantine seed Cadantine seed 1 Very rare 1,034
Lantadyme seed Lantadyme seed 1 Very rare 2,358
Dwarf weed seed Dwarf weed seed 1 Very rare 423
Torstol seed Torstol seed 1 Very rare 58,385

Herbs[]

The herbs dropped vary between noted and unnoted.

Item Quantity Rarity GE market price
Grimy guam leaf Grimy guam leaf 1 Common 15
Grimy marrentill Grimy marrentill 1 Common 13
Grimy tarromin Grimy tarromin 1 Common 132
Grimy harralander Grimy harralander 1 Uncommon 674
Grimy ranarr weed Grimy ranarr weed 1 Uncommon 7,640
Grimy irit leaf Grimy irit leaf 1 Uncommon 775
Grimy avantoe Grimy avantoe 1 Uncommon 1,814
Grimy kwuarm Grimy kwuarm 1 Uncommon 1,165
Grimy cadantine Grimy cadantine 1 Uncommon 1,312
Grimy lantadyme Grimy lantadyme 1 Uncommon 1,391
Grimy dwarf weed Grimy dwarf weed 1 Uncommon 448

Other[]

Item Quantity Rarity GE market price
Numulite Numulite 5–14 Common (9/35; 26%) 100–280
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 2,772
Toad's legs Toad's legs 2 (noted) Uncommon 1,026
Caviar Caviar 2 (noted) Uncommon 480
Oyster pearls Oyster pearls 1 Uncommon 778
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 455
Uncut emerald Uncut emerald 1 Rare 679
Uncut ruby Uncut ruby 1 Rare 1,249
Nature talisman Nature talisman 1 Very rare 744
Uncut diamond Uncut diamond 1 Very rare 2,627
Rune javelin Rune javelin 5 Very rare 875
Loop half of key Loop half of key 1 Very rare 10,307
Tooth half of key Tooth half of key 1 Very rare 10,840
Rune spear Rune spear 1 Very rare 11,933
Shield left half Shield left half 1 Very rare 65,697
Dragon spear Dragon spear 1 Very rare 37,226


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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