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.
Drops[]
Runes[]
Item Quantity Rarity GE market price 
Earth rune 5 Common 20
Water rune 9 Common 36
Pure essence 4–8 Common 8–16
Talismans[]
Item Quantity Rarity GE market price
Fire talisman 1 Uncommon 4,924
Air talisman 1 Uncommon 92
Cosmic talisman 1 Uncommon 784
Body talisman 1 Uncommon 1,028
Water talisman 1 Uncommon 171
Herbs[]
Item Quantity Rarity GE market price
Guam leaf 1 Uncommon 26
Marrentill 1 Uncommon 24
Tarromin 1 Uncommon 153
Harralander 1 Uncommon 706
Ranarr weed 1 Uncommon 7,682
Irit leaf 1 Uncommon 789
Avantoe 1 Uncommon 1,848
Kwuarm 1 Uncommon 1,195
Cadantine 1 Uncommon 1,339
Lantadyme 1 Uncommon 1,419
Dwarf weed 1 Uncommon 427
Equipment[]
Item Quantity Rarity GE market price
Steel arrow 4–7 Common 128–224
Iron arrow 2–17 Common 10–85
Fremennik brown shirt 1 Rare 12
Fremennik blade 1 Rare Not sold
Seeds[]
Item Quantity Rarity GE market price
Onion seed 1 Uncommon 1
Potato seed 1 Uncommon 1
Cabbage seed 1 Uncommon 1
Tomato seed 1 Uncommon 1
Watermelon seed 1–3 Very rare 71–213
Other[]
Item Quantity Rarity GE market price
Seaweed 4 Common 180
Edible seaweed 4 Common 68
Raw lobster 1 Common 210
Lobster pot 1 Common 167
Tinderbox 1 Common 62
Soda ash 1 Uncommon 65
Coins 355 Uncommon Not sold
Snape grass 1 Uncommon 271
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 1 Rare 455
Uncut emerald 1 Rare 679
Uncut ruby 1 Rare 1,249
Nature talisman 1 Very rare 744
Uncut diamond 1 Very rare 2,627
Rune javelin 5 Very rare 875
Loop half of key 1 Very rare 10,307
Tooth half of key 1 Very rare 10,840
Rune spear 1 Very rare 11,933
Shield left half 1 Very rare 65,697
Dragon spear 1 Very rare 37,226
Trivia[]
- 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".