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.png Earth rune 5 Common 20
Water rune.png Water rune 9 Common 36
Pure essence.png Pure essence 4–8 Common 8–16


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


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


Item Quantity Rarity GE market price
Steel arrow 5.png Steel arrow 4–7 Common 128–224
Iron arrow 5.png Iron arrow 2–17 Common 10–85
Fremennik brown shirt.png Fremennik brown shirt 1 Rare 12
Fremennik blade.png Fremennik blade 1 Rare Not sold


Item Quantity Rarity GE market price
Onion seed 5.png Onion seed 1 Uncommon 1
Potato seed 5.png Potato seed 1 Uncommon 1
Cabbage seed 5.png Cabbage seed 1 Uncommon 1
Tomato seed 5.png Tomato seed 1 Uncommon 1
Watermelon seed 5.png Watermelon seed 1–3 Very rare 71–213


Item Quantity Rarity GE market price
Seaweed.png Seaweed 4 Common 180
Edible seaweed.png Edible seaweed 4 Common 68
Raw lobster.png Raw lobster 1 Common 210
Lobster pot.png Lobster pot 1 Common 167
Tinderbox.png Tinderbox 1 Common 62
Soda ash.png Soda ash 1 Uncommon 65
Coins 250.png Coins 355 Uncommon Not sold
Snape grass.png Snape grass 1 Uncommon 271
Clue scroll (medium).png 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.png Uncut sapphire 1 Rare 455
Uncut emerald.png Uncut emerald 1 Rare 679
Uncut ruby.png Uncut ruby 1 Rare 1,249
Nature talisman.png Nature talisman 1 Very rare 744
Uncut diamond.png Uncut diamond 1 Very rare 2,627
Rune javelin.png Rune javelin 5 Very rare 875
Loop half of key.png Loop half of key 1 Very rare 10,307
Tooth half of key.png Tooth half of key 1 Very rare 10,840
Rune spear.png Rune spear 1 Very rare 11,933
Shield left half.png Shield left half 1 Very rare 65,697
Dragon spear.png 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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