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 4,504
Air talisman Air talisman 1 Uncommon 75
Cosmic talisman Cosmic talisman 1 Uncommon 755
Body talisman Body talisman 1 Uncommon 651
Water talisman Water talisman 1 Uncommon 169


Item Quantity Rarity GE market price
Guam leaf Guam leaf 1 Uncommon 20
Marrentill Marrentill 1 Uncommon 26
Tarromin Tarromin 1 Uncommon 175
Harralander Harralander 1 Uncommon 647
Ranarr weed Ranarr weed 1 Uncommon 7,919
Irit leaf Irit leaf 1 Uncommon 890
Avantoe Avantoe 1 Uncommon 1,878
Kwuarm Kwuarm 1 Uncommon 1,275
Cadantine Cadantine 1 Uncommon 1,599
Lantadyme Lantadyme 1 Uncommon 1,630
Dwarf weed Dwarf weed 1 Uncommon 592


Item Quantity Rarity GE market price
Steel arrow 5 Steel arrow 4–7 Common 128–224
Iron arrow 5 Iron arrow 2–17 Common 12–102
Fremennik brown shirt Fremennik brown shirt 1 Rare 42
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 64–192


Item Quantity Rarity GE market price
Seaweed Seaweed 4 Common 188
Edible seaweed Edible seaweed 4 Common 104
Raw lobster Raw lobster 1 Common 129
Lobster pot Lobster pot 1 Common 105
Tinderbox Tinderbox 1 Common 65
Soda ash Soda ash 1 Uncommon 64
Coins 250 Coins 355 Uncommon Not sold
Snape grass Snape grass 1 Uncommon 160
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 487
Uncut emerald Uncut emerald 1 Rare 684
Uncut ruby Uncut ruby 1 Rare 1,339
Nature talisman Nature talisman 1 Very rare 1,126
Uncut diamond Uncut diamond 1 Very rare 2,932
Rune javelin Rune javelin 5 Very rare 860
Loop half of key Loop half of key 1 Very rare 9,643
Tooth half of key Tooth half of key 1 Very rare 9,770
Rune spear Rune spear 1 Very rare 11,987
Shield left half Shield left half 1 Very rare 65,535
Dragon spear Dragon spear 1 Very rare 37,759


  • 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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