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Lobstrosity
Lobstrosity
Release date 7 September 2017 (Update)
Members? Yes
Combat level 68
Always drops Raw lobster
Examine
An extremely vicious lobster type thing.
Combat info
Hitpoints 50
Aggressive Yes
Poisonous No
Max hit 9
Weakness Crush
Attack Styles
Melee (stab)
Slayer icon Slayer info
Not assigned
Combat icon Combat stats
Attack icon Strength icon Defence icon Magic icon Ranged icon
60 80 40 1 1
Attack icon Aggressive stats
White dagger White scimitar White warhammer Magic icon Ranged icon
+0 +0 +0 +0 +0
Defence icon Defensive stats
White dagger White scimitar White warhammer Magic icon Ranged icon
+30 +50 +15 +99 +70
Other bonuses Immunities
Attack icon
Strength icon
Ranged Strength icon
Magic Damage icon
Poison hitsplat
Venom hitsplat
+0 +0 +0 +0% Not immune Not immune
Attack speed
Monster attack speed 6

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 299

Runes

Item Quantity Rarity GE market price
Water rune Water rune 100 Common 500
Chaos rune Chaos rune 20 Uncommon 2,020
Nature rune Nature rune 10 Uncommon 2,540
Death rune Death rune 10 Uncommon 2,850

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 1,348–6,740
Limpwurt seed 5 Limpwurt seed 1 Uncommon 272
Strawberry seed 5 Strawberry seed 1 Uncommon 24
Herb seed 5 Marrentill seed 1 Uncommon 3
Jangerberry seed 5 Jangerberry seed 1 Uncommon 2
Herb seed 5 Tarromin seed 1 Uncommon 7
Wildblood seed 5 Wildblood seed 1 Uncommon 462
Watermelon seed 5 Watermelon seed 1 Rare 358
Herb seed 5 Harralander seed 1 Rare 31
Herb seed 5 Ranarr seed 1 Rare 44,456
Whiteberry seed 5 Whiteberry seed 1 Rare 74
Mushroom spore 5 Mushroom spore 1 Rare 64
Herb seed 5 Toadflax seed 1 Rare 3,384
Herb seed 5 Irit seed 1 Rare 98
Belladonna seed 5 Belladonna seed 1 Rare 85
Poison ivy seed 5 Poison ivy seed 1 Rare 570
Cactus seed 5 Cactus seed 1 Rare 229
Herb seed 5 Avantoe seed 1 Rare 1,579
Herb seed 5 Kwuarm seed 1 Rare 1,026
Herb seed 5 Snapdragon seed 1 Very rare 55,832
Herb seed 5 Cadantine seed 1 Very rare 850
Herb seed 5 Lantadyme seed 1 Very rare 1,909
Herb seed 5 Dwarf weed seed 1 Very rare 1,065
Herb seed 5 Torstol seed 1 Very rare 88,286

Herbs

The herbs dropped vary between noted and unnoted.

Item Quantity Rarity GE market price
Grimy guam leaf Grimy guam leaf 1 Common 9
Grimy marrentill Grimy marrentill 1 Common 13
Grimy tarromin Grimy tarromin 1 Common 127
Grimy harralander Grimy harralander 1 Uncommon 817
Grimy ranarr weed Grimy ranarr weed 1 Uncommon 7,767
Grimy irit leaf Grimy irit leaf 1 Uncommon 881
Grimy avantoe Grimy avantoe 1 Uncommon 2,197
Grimy kwuarm Grimy kwuarm 1 Uncommon 1,781
Grimy cadantine Grimy cadantine 1 Uncommon 1,570
Grimy lantadyme Grimy lantadyme 1 Uncommon 1,575
Grimy dwarf weed Grimy dwarf weed 1 Uncommon 1,055

Other

Item Quantity Rarity GE market price
Numulite 25 Numulite 5–14 Common (9/35; 26%) 205–574
Coins 1000 Coins 1,000 Common Not sold
Pufferfish Pufferfish 1 Common Not sold
Seaweed Seaweed 6 (noted) Uncommon 318
Giant seaweed Giant seaweed 6 (noted) Uncommon 5,034
Toad's legs Toad's legs 2 (noted) Uncommon 914
Caviar Caviar 2 (noted) Uncommon 324
Oyster pearls Oyster pearls 1 Uncommon 693
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 970
Uncut emerald Uncut emerald 1 Rare 921
Uncut ruby Uncut ruby 1 Rare 1,736
Nature talisman Nature talisman 1 Very rare 1,342
Uncut diamond Uncut diamond 1 Very rare 3,769
Rune javelin Rune javelin 5 Very rare 755
Loop half of key Loop half of key 1 Very rare 9,183
Tooth half of key Tooth half of key 1 Very rare 13,691
Rune spear Rune spear 1 Very rare 12,040
Shield left half Shield left half 1 Very rare 65,395
Dragon spear Dragon spear 1 Very rare 37,187


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.