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 16–32


Item Quantity Rarity GE market price
Fire talisman Fire talisman 1 Uncommon 2,688
Air talisman Air talisman 1 Uncommon 109
Cosmic talisman Cosmic talisman 1 Uncommon 544
Body talisman Body talisman 1 Uncommon 460
Water talisman Water talisman 1 Uncommon 159


Item Quantity Rarity GE market price
Guam leaf Guam leaf 1 Uncommon 25
Marrentill Marrentill 1 Uncommon 20
Tarromin Tarromin 1 Uncommon 160
Harralander Harralander 1 Uncommon 765
Ranarr weed Ranarr weed 1 Uncommon 8,094
Irit leaf Irit leaf 1 Uncommon 927
Avantoe Avantoe 1 Uncommon 1,637
Kwuarm Kwuarm 1 Uncommon 1,352
Cadantine Cadantine 1 Uncommon 1,333
Lantadyme Lantadyme 1 Uncommon 1,206
Dwarf weed Dwarf weed 1 Uncommon 836


Item Quantity Rarity GE market price
Steel arrow 5 Steel arrow 4–7 Common 128–224
Iron arrow 5 Iron arrow 2–17 Common 14–119
Fremennik brown shirt Fremennik brown shirt 1 Rare 254
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 263–789


Item Quantity Rarity GE market price
Seaweed Seaweed 4 Common 288
Edible seaweed Edible seaweed 4 Common 140
Raw lobster Raw lobster 1 Common 201
Lobster pot Lobster pot 1 Common 80
Tinderbox Tinderbox 1 Common 71
Soda ash Soda ash 1 Uncommon 72
Coins 250 Coins 355 Uncommon Not sold
Snape grass Snape grass 1 Uncommon 101
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 849
Uncut emerald Uncut emerald 1 Rare 875
Uncut ruby Uncut ruby 1 Rare 1,590
Nature talisman Nature talisman 1 Very rare 804
Uncut diamond Uncut diamond 1 Very rare 2,960
Rune javelin Rune javelin 5 Very rare 715
Loop half of key Loop half of key 1 Very rare 8,066
Tooth half of key Tooth half of key 1 Very rare 13,358
Rune spear Rune spear 1 Very rare 12,119
Shield left half Shield left half 1 Very rare 65,522
Dragon spear Dragon spear 1 Very rare 37,304


  • 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".