Rock lobster | OSRS Index

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Rock lobster



Released		7 November 2005 (Update)
Members		Yes
Combat level		127
Size		2x2
Examine		It wasn't a rock... it was a rock lobster!
League region		Fremennik✓

Combat info

XP bonus		+2.5%
Max hit		11
Aggressive		Yes
Poisonous		No
Attack style		Crush
Attack speed		2 ticks (1.2 seconds)

Combat stats


150	100	100	100	1	1

Aggressive stats


+0	+0	+0	+0	+0	+0

Melee defence


+100		+100		+50

Magic defence


+50			25% weakness

Ranged defence


+150		+150		+90

Immunities

Poison		0% resistance
Venom		0% resistance
Cannons		Not immune
Thralls		Not immune

Open in DPS calculator
Advanced data

Monster ID		5944
Link		MOID

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. Their attack speed is as fast as darts on Rapid (they attack every second game tick), making them incredibly dangerous.

Locations

Location	Levels	Spawns	Map	League region
Waterbirth Island Dungeon, ground floor	127	12	Show map	Fremennik✓
Waterbirth Island Dungeon, 1^st floor	127	2	Show map	Fremennik✓
Waterbirth Island Dungeon, 2^nd floor	127	7	Show map	Fremennik✓
Waterbirth Island Dungeon, 3^rd floor	127	3	Show map	Fremennik✓

Drops

Drop rates are estimated based on 6,767 samples from the Drop Rate Project, unless otherwise cited.

The average Rock lobster kill is worth 298.97.

100%

	Item	Quantity	Rarity	Price	High Alch
	Raw lobster	1	Always	110	42

Runes and ammunition

Item	Quantity	Rarity	Price	High Alch
Earth rune	1–20	10/128	5–100	2–40
Water rune	1–20	10/128	5–100	2–40
Steel arrow	1–10	10/128	6–60	7–70
Iron arrow	1–20	10/128	6–120	1–20

Herbs

There is a 3/128 chance of rolling the herb drop table.

Item	Quantity	Rarity	Price	High Alch
Grimy guam leaf	1	1/170.7	189	7
Grimy marrentill	1	1/227.6	185	8
Grimy tarromin	1	1/303.4	120	9
Grimy harralander	1	1/390.1	284	9
Grimy ranarr weed	1	1/496.5	5,262	18
Grimy irit leaf	1	1/682.7	1,258	10
Grimy avantoe	1	1/910.2	1,341	10
Grimy kwuarm	1	1/1,092.3	1,814	12
Grimy cadantine	1	1/1,365.3	2,076	13
Grimy lantadyme	1	1/1,820.4	1,232	13
Grimy dwarf weed	1	1/1,820.4	1,343	14

Seeds

There is a 1/128 chance of rolling the allotment seed drop table.

Item	Quantity	Rarity	Price	High Alch
Potato seed	1–4	1/256	4–16	1–4
Onion seed	1–3	1/512	3–9	1–3
Cabbage seed	1–3	1/1,024	6–18	1–3
Tomato seed	1–2	1/2,048	3–6	2–4
Sweetcorn seed	1–2	1/4,096	5–10	4–8
Strawberry seed	1	1/8,192	7	10
Watermelon seed	1	1/16,384	234	33
Snape grass seed	1	1/16,384	15,101	56

Talismans

There is a 4/128 chance of rolling the talisman drop table.

Item	Quantity	Rarity	Price	High Alch
Air talisman	1	1/224	201	2
Body talisman	1	1/224	1,690	2
Earth talisman	1	1/224	558	2
Fire talisman	1	1/224	4,550	2
Mind talisman	1	1/224	1,255	2
Water talisman	1	1/224	275	2
Cosmic talisman	1	1/560	187	2
Chaos talisman	1	1/746.7	236	2
Nature talisman	1	1/746.7	268	2

Materials

Item	Quantity	Rarity	Price	High Alch
Pure essence	4	10/128	8	8
Seaweed	1–3	10/128	5–15	1–3
Soda ash	1	10/128	33	1
Snape grass	1	10/128	1,080	6

Other

Item	Quantity	Rarity	Price	High Alch
Edible seaweed	1–3	10/128	11–33	1–3
Lobster pot	1	10/128	135	12
Tinderbox	1	10/128	98	0

Gem drop table

There is a 1/128 chance of rolling the gem drop table.

Item	Quantity	Rarity	Price	High Alch
Nothing	N/A	1/256.47; Never^{[d 1]}	N/A	N/A
Uncut sapphire	1	1/512; 1/260^{[d 2]}	228	15
Uncut emerald	1	1/1,024; 1/520^{[d 2]}	473	30
Uncut ruby	1	1/2,048; 1/1,040^{[d 2]}	1,087	60
Nature talisman	1	1/5,461.33; 1/2,773.33^{[d 2]}	268	2
Uncut diamond	1	1/8,192; 1/4,160^{[d 2]}	2,439	120
Rune javelin	5	1/16,384; 1/8,320^{[d 2]}	675	1,200
Loop half of key	1	1/16,384; 1/8,320^{[d 2]}	9,756	60
Tooth half of key	1	1/16,384; 1/8,320^{[d 2]}	9,887	60
Rune spear	1	1/262,144; 1/15,600^{[d 2]}^{[d 3]}	11,599	12,480
Shield left half	1	1/524,288; 1/31,200^{[d 2]}^{[d 3]}	65,355	66,000
Dragon spear	1	1/699,050.67; 1/41,600^{[d 2]}^{[d 3]}	38,438	37,440

^ The "nothing" drop is removed while wearing a ring of wealth.
^ ^2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 The drop rate is increased while wearing a ring of wealth due to the "nothing" drop being removed.
^ ^3.0 ^3.1 ^3.2 Only dropped if Legends' Quest has been finished; if not, a talisman is dropped instead.

Tertiary

	Item	Quantity	Rarity	Price	High Alch
	Clue scroll (medium)	1	1/128^{[d 1]}^{[d 2]}^[1]	Not sold	12

^ The medium clue scroll drop rate increases to 1/121 after unlocking the medium Combat Achievements rewards tier.
^ Clue scrolls will drop as scroll boxes after the completion of X Marks the Spot.

Changes

Date	Changes
25 June 2025 (Update)	Rock lobsters now have a 25% elemental weakness to earth spells.

Trivia

The examine text is a reference to the B-52's song "Rock Lobster".

References

^ Jagex. Mod Tide's Twitter account. 24 May 2019. Archived from the original on 24 May 2019. Mod Tide: "I know its been a while since the clue expansion but here is the information on clue scroll drop rates and loot chances! If anything changes I will keep you posted."

Waterbirth Island

NPCs

Dagannoth Kings

	Prime Rex Supreme
Uniques	Archers ring Berserker ring Seers ring Warrior ring Mud battlestaff Seercull

Monsters

Items

Rock-shell armour	Helm Plate Legs Gloves Boots Rock-shell chunk Rock-shell shard Rock-shell splinter
Skeletal armour	Helm Top Bottoms Gloves Boots Fibula piece Ribcage piece Skull piece
Spined armour	Helm Body Chaps Gloves Boots Circular hide Flattened hide Stretched hide
Fremennik helmets	Archer helm Farseer helm Fremennik helm Warrior helm
Other	Dagannoth hide Fremennik blade Fremennik shield Snape grass

Source site	Old School RuneScape Wiki
Canonical source	Rock lobster
Content license	CC BY-NC-SA 3.0
License status	declared
Picture	Rock lobster · file details