Rock lobsters are found in the Waterbirth Island Dungeon's fifth sub-level, in Room 16. They are similar to Giant rock crabs in the fact that they are initially disguised as large rocks, but they will attack the player as they approach. They have very high Defence (though they are weak to Magic attacks) and can hit up to 15 Hitpoints, but rarely hit over 11 Hitpoints. Their attack speed is two bars faster than the Abyssal whip (as fast as darts on Rapid), making them incredibly dangerous.



Item Quantity Rarity GE market price
Earth rune Earth rune 5 Common 25
Water rune Water rune 9 Common 45
Pure essence Pure essence 4–8 Common 8–16


Item Quantity Rarity GE market price
Fire talisman Fire talisman 1 Uncommon 5,061
Air talisman Air talisman 1 Uncommon 78
Cosmic talisman Cosmic talisman 1 Uncommon 834
Body talisman Body talisman 1 Uncommon 1,022
Water talisman Water talisman 1 Uncommon 198


Item Quantity Rarity GE market price
Guam leaf Guam leaf 1 Uncommon 22
Marrentill Marrentill 1 Uncommon 22
Tarromin Tarromin 1 Uncommon 148
Harralander Harralander 1 Uncommon 686
Ranarr weed Ranarr weed 1 Uncommon 8,444
Irit leaf Irit leaf 1 Uncommon 868
Avantoe Avantoe 1 Uncommon 1,918
Kwuarm Kwuarm 1 Uncommon 1,305
Cadantine Cadantine 1 Uncommon 1,557
Lantadyme Lantadyme 1 Uncommon 1,466
Dwarf weed Dwarf weed 1 Uncommon 473


Item Quantity Rarity GE market price
Steel arrow 5 Steel arrow 4–7 Common 128–224
Iron arrow 5 Iron arrow 2–17 Common 10–85
Fremennik brown shirt Fremennik brown shirt 1 Rare 10
Fremennik blade Fremennik blade 1 Rare Not sold


Item Quantity Rarity GE market price
Onion seed 5 Onion seed 1 Uncommon 1
Potato seed 5 Potato seed 1 Uncommon 1
Cabbage seed 5 Cabbage seed 1 Uncommon 1
Tomato seed 5 Tomato seed 1 Uncommon 1
Watermelon seed 5 Watermelon seed 1–3 Very rare 98–294


Item Quantity Rarity GE market price
Seaweed Seaweed 4 Common 192
Edible seaweed Edible seaweed 4 Common 84
Raw lobster Raw lobster 1 Common 201
Lobster pot Lobster pot 1 Common 203
Tinderbox Tinderbox 1 Common 71
Soda ash Soda ash 1 Uncommon 90
Coins 250 Coins 355 Uncommon Not sold
Snape grass Snape grass 1 Uncommon 276
Clue scroll (medium) Clue scroll (medium) 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 473
Uncut emerald Uncut emerald 1 Rare 738
Uncut ruby Uncut ruby 1 Rare 1,357
Nature talisman Nature talisman 1 Very rare 848
Uncut diamond Uncut diamond 1 Very rare 2,662
Rune javelin Rune javelin 5 Very rare 815
Loop half of key Loop half of key 1 Very rare 10,263
Tooth half of key Tooth half of key 1 Very rare 10,799
Rune spear Rune spear 1 Very rare 11,930
Shield left half Shield left half 1 Very rare 65,752
Dragon spear Dragon spear 1 Very rare 37,334


  • This monster's name as well as its examine text is a reference to the B-52's song "Rock Lobster". The lyrics to the chorus include the line "It wasn't a rock, was a rock lobster".
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