Rock Crab | OSRS Index

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Rock Crab



Released		2 November 2004 (Update)
Members		Yes
Combat level		13
Size		1x1
Examine		No one likes crabs...
League region		Fremennik✓ Kourend✓

Combat info

XP bonus		+0%
Max hit		1
Aggressive		Yes
Poisonous		No
Attack style		Crush
Attack speed		4 ticks (2.4 seconds)
Respawn time		50 ticks (30 seconds)

Slayer info

Slayer level		None
Slayer XP		50 xp
Category		Crabs
Assigned by

Combat stats


50	1	1	1	1	1

Aggressive stats


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

Melee defence


+0		+0		+0

Magic defence


+0			20% weakness

Ranged defence


+0		+0		+0

Immunities

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

Open in DPS calculator
Advanced data

Monster ID		100,102
Link		MOID

A player in combat with multiple rock crabs.

Rock Crabs are aggressive monsters that look like harmless rocks while disguised, but attack when walked by. Unlike most other enemies and NPCs, Rock Crabs are not marked with yellow dots on the player's minimap; this is probably due to the crabs' appearance, which camouflages them as rocks.

Players can tell if a rock is a Rock Crab by looking at the rock's shape; Rock Crabs are tall and oval shaped while normal rocks in their area are mostly in large clusters of shattered pieces. Another way to tell is by right clicking on them. If the text colour is yellow, it is a Rock Crab. If the text is blue, it is just a prop.

Rock Crabs are excellent for training at low-mid combat levels due to their low Defence and relatively high Hitpoints, though low level players should consider bringing food. The more numerous, closer-knit and higher health sand, frost and ammonite crabs have made rock crabs less popular amongst players, especially at higher levels.

Like all other crabs, rock crabs start off aggressive but will become tolerant of the player after ten minutes. As they must be active in order to be fought, players must reset their aggression timer once they become tolerant. To make the crabs aggressive again, exit the surrounding area (halfway to the entrance to the village in Rellekka, or by entering and exiting the entrance to Keldagrim) and enter again. As they are "dormant" until "awoken" by a passing player, rock crabs cannot be attacked until they are made aggressive once more.

Locations

Location	Levels	Spawns	Map	League region
North of Rellekka	13	34	Show map	Fremennik✓
Waterbirth Island	13	19	Show map	Fremennik✓
West of Mount Quidamortem	13	28	Show map	Kourend✓
Waterbirth Island Dungeon	13	18	Show map	Fremennik✓
Brine Rat Cavern	13	4	Show map	Fremennik✓
Charred Island	13	7	Show map	N/A

Drops

The following drop rates are provided by Jagex, unless otherwise specified.

The average Rock Crab kill is worth 78.69.

Weapons

	Item	Quantity	Rarity	Price	High Alch
	Bronze pickaxe	1	6/128	100	0
	Iron pickaxe	1	5/128	102	84

Seaweed

Item	Quantity	Rarity	Price	High Alch
Seaweed	1	4/128	5	1
Seaweed	2	4/128	10	2
Seaweed	5	2/128	25	5
Edible seaweed	2	2/128	22	2

Ores

Item	Quantity	Rarity	Price	High Alch
Tin ore	3	4/128	30	3
Iron ore	1	2/128	76	10
Coal	2	2/128	292	54
Copper ore	3	2/128	30	3

Oyster

Item	Quantity	Rarity	Price	High Alch
Oyster	2	12/128	100	240
Oyster	1	9/128	50	120
Empty oyster	1	3/128	Not sold	3
Empty oyster	3	1/128	Not sold	9
Oyster pearl	1	1/128	31	67

Coins

Item	Quantity	Rarity	Price	High Alch
Coins	4	29/128	4	4
Coins	8	6/128	8	8
Coins	36	8/128	36	36

Other

Item	Quantity	Rarity	Price	High Alch
Nothing	N/A	19/128	N/A	N/A
Fishing bait	10	2/128	50	10
Opal bolt tips	5	2/128	105	20
Spinach roll	1	1/128	Not sold	0
Casket	1	1/128	714	30

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 (elite)	1	Always^{[d 1]}	Not sold	12
Reward casket (elite)	1	Always^{[d 1]}	Not sold	30
Clue scroll (easy)	1	1/128^{[d 2]}^{[d 3]}	Not sold	12

^ ^1.0 ^1.1 Elite clue scrolls or elite caskets are only dropped when completing an elite cryptic clue asking the player to kill a Rock Crab.
^ The easy clue scroll drop rate increases to 1/121 after unlocking the easy Combat Achievements rewards tier.
^ Clue scrolls will drop as scroll boxes after the completion of X Marks the Spot.

Treasure Trails

Killing a rock crab is the solution to the elite cryptic clue: You might have to turn over a few stones to progress.

Changes

Date	Changes
25 June 2025 (Update)	Rock crabs now have a 20% elemental weakness to earth spells.
26 March 2025 (Update \| poll)	Crabs can now be assigned as a Slayer task by Mazchna, Vannaka, and Chaeldar.

v t e Brine Rat Cavern
Monsters	Brine rat Giant bat Rock Crab Skeleton fremennik Ulfric
Scenery	Camping gear Camping fire
Related	Key Olaf's Quest Rotten barrel