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 20
Water rune Water rune 9 Common 36
Pure essence Pure essence 4–8 Common 8–16


Item Quantity Rarity GE market price
Fire talisman Fire talisman 1 Uncommon 4,924
Air talisman Air talisman 1 Uncommon 92
Cosmic talisman Cosmic talisman 1 Uncommon 784
Body talisman Body talisman 1 Uncommon 1,028
Water talisman Water talisman 1 Uncommon 171


Item Quantity Rarity GE market price
Guam leaf Guam leaf 1 Uncommon 26
Marrentill Marrentill 1 Uncommon 24
Tarromin Tarromin 1 Uncommon 153
Harralander Harralander 1 Uncommon 706
Ranarr weed Ranarr weed 1 Uncommon 7,682
Irit leaf Irit leaf 1 Uncommon 789
Avantoe Avantoe 1 Uncommon 1,848
Kwuarm Kwuarm 1 Uncommon 1,195
Cadantine Cadantine 1 Uncommon 1,339
Lantadyme Lantadyme 1 Uncommon 1,419
Dwarf weed Dwarf weed 1 Uncommon 427


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 12
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 71–213


Item Quantity Rarity GE market price
Seaweed Seaweed 4 Common 180
Edible seaweed Edible seaweed 4 Common 68
Raw lobster Raw lobster 1 Common 210
Lobster pot Lobster pot 1 Common 167
Tinderbox Tinderbox 1 Common 62
Soda ash Soda ash 1 Uncommon 65
Coins 250 Coins 355 Uncommon Not sold
Snape grass Snape grass 1 Uncommon 271
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 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


  • 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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