Rock lobster
Rock lobster
Release date 1 August 2005 (Update)
Members? Yes
Combat level 127
Always drops None
Disguised: A Rock.
Normal: It wasn't a rock... It was a rock lobster!
Combat info
Hitpoints 150
Aggressive Yes
Poisonous No
Max hit 15
Weakness Magic, crush
Attack Styles
Melee (crush)
Slayer icon Slayer info
Not assigned
Combat icon Combat stats
Attack icon Strength icon Defence icon Magic icon Ranged icon
100 100 100 1 1
Attack icon Aggressive stats
White dagger White scimitar White warhammer Magic icon Ranged icon
+0 +0 +0 +0 +0
Defence icon Defensive stats
White dagger White scimitar White warhammer Magic icon Ranged icon
+100 +100 +50 +50 +150
Other bonuses Immunities
Attack icon
Strength icon
Ranged Strength icon
Magic Damage icon
Poison hitsplat
Venom hitsplat
+0 +0 +0 +0% Not immune Not immune
Attack speed
Monster attack speed 8

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 1,650
Air talisman Air talisman 1 Uncommon 57
Cosmic talisman Cosmic talisman 1 Uncommon 377
Body talisman Body talisman 1 Uncommon 1,002
Water talisman Water talisman 1 Uncommon 154


Item Quantity Rarity GE market price
Guam leaf Guam leaf 1 Uncommon 14
Marrentill Marrentill 1 Uncommon 17
Tarromin Tarromin 1 Uncommon 140
Harralander Harralander 1 Uncommon 689
Ranarr weed Ranarr weed 1 Uncommon 7,274
Irit leaf Irit leaf 1 Uncommon 912
Avantoe Avantoe 1 Uncommon 2,163
Kwuarm Kwuarm 1 Uncommon 2,109
Cadantine Cadantine 1 Uncommon 1,395
Lantadyme Lantadyme 1 Uncommon 1,653
Dwarf weed Dwarf weed 1 Uncommon 739


Item Quantity Rarity GE market price
Steel arrow 5 Steel arrow 4–7 Common 164–287
Iron arrow 5 Iron arrow 2–17 Common 16–136
Fremennik brown shirt Fremennik brown shirt 1 Rare 288
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 283–849


Item Quantity Rarity GE market price
Seaweed Seaweed 4 Common 208
Edible seaweed Edible seaweed 4 Common 64
Raw lobster Raw lobster 1 Common 176
Lobster pot Lobster pot 1 Common 274
Tinderbox Tinderbox 1 Common 83
Soda ash Soda ash 1 Uncommon 96
Coins 250 Coins 355 Uncommon Not sold
Snape grass Snape grass 1 Uncommon 45
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 928
Uncut emerald Uncut emerald 1 Rare 835
Uncut ruby Uncut ruby 1 Rare 1,799
Nature talisman Nature talisman 1 Very rare 600
Uncut diamond Uncut diamond 1 Very rare 3,920
Rune javelin Rune javelin 5 Very rare 670
Loop half of key Loop half of key 1 Very rare 8,345
Tooth half of key Tooth half of key 1 Very rare 14,060
Rune spear Rune spear 1 Very rare 12,086
Shield left half Shield left half 1 Very rare 65,509
Dragon spear Dragon spear 1 Very rare 37,822


  • 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".