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 2,214
Air talisman Air talisman 1 Uncommon 76
Cosmic talisman Cosmic talisman 1 Uncommon 575
Body talisman Body talisman 1 Uncommon 883
Water talisman Water talisman 1 Uncommon 145


Item Quantity Rarity GE market price
Guam leaf Guam leaf 1 Uncommon 26
Marrentill Marrentill 1 Uncommon 36
Tarromin Tarromin 1 Uncommon 173
Harralander Harralander 1 Uncommon 692
Ranarr weed Ranarr weed 1 Uncommon 7,807
Irit leaf Irit leaf 1 Uncommon 879
Avantoe Avantoe 1 Uncommon 2,157
Kwuarm Kwuarm 1 Uncommon 1,398
Cadantine Cadantine 1 Uncommon 1,596
Lantadyme Lantadyme 1 Uncommon 1,657
Dwarf weed Dwarf weed 1 Uncommon 552


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 56
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 86–258


Item Quantity Rarity GE market price
Seaweed Seaweed 4 Common 172
Edible seaweed Edible seaweed 4 Common 76
Raw lobster Raw lobster 1 Common 135
Lobster pot Lobster pot 1 Common 208
Tinderbox Tinderbox 1 Common 33
Soda ash Soda ash 1 Uncommon 51
Coins 250 Coins 355 Uncommon Not sold
Snape grass Snape grass 1 Uncommon 110
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 539
Uncut emerald Uncut emerald 1 Rare 746
Uncut ruby Uncut ruby 1 Rare 1,404
Nature talisman Nature talisman 1 Very rare 675
Uncut diamond Uncut diamond 1 Very rare 2,932
Rune javelin Rune javelin 5 Very rare 865
Loop half of key Loop half of key 1 Very rare 10,038
Tooth half of key Tooth half of key 1 Very rare 9,863
Rune spear Rune spear 1 Very rare 11,901
Shield left half Shield left half 1 Very rare 65,601
Dragon spear Dragon spear 1 Very rare 37,695


  • 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".
Community content is available under CC-BY-SA unless otherwise noted.