Giant Rock Crab

The Old School RuneScape Wiki also has an article on: osrsw:Giant Rock Crab

Giant Rock Crab
Release			1 August 2005 (Update)
Members			Yes
Actions			• Attack • Examine
Race			? (edit)
Examine
• No one likes crabs... especially really big ones! (after being approached) • Heavy rock! (when disguised as a boulder)
Combat info
Level			LP			XP			XP
95			3,400			399			131.6
Equipment XP (2H/MH & Armour/OH)
23 / 15 / 7
Aggressive						Poisonous
Offensive
Max hit
272			0			0			0
Style						Rate
						6 ticks (3.6s)
Combat levels
68				1				1
Accuracy
1,409				0				0
Defensive
Armour				Weakness			Susceptible
1,409		68
Affinities
90			55			45			65
Immunities
Not immune			Not immune			Not immune			Not immune
Advanced data
NPC ID				2452
Links				bestiary • MRND
FAQ • doc

Giant Rock Crabs are larger versions of rock crabs. Similarly to their smaller cousins, they disguise themselves as boulders, and only reveal themselves to be giant rock crabs if a player approaches within 1 tile of them, at which point they become aggressive and attackable. Attempting to target or attack them in their boulder disguise will cancel the action and give the player the message "Invalid target."

They are primarily known for being the only monsters to drop rock-shell fragment items, used to create rock-shell armour. They are also known for being a fast source of gold charms, having a high drop rate, relatively low lifepoints, and that three charms are dropped at once.

Giant rock crabs are one of the few monsters that use the retreat mechanic, where they will try to flee from battle when they become critically wounded.

Locations

Location	Levels	Members	Spawns	Map
Waterbirth Island Dungeon sublevel 2	95		6	Maplink
Waterbirth Island Dungeon sublevel 3	95		5	Maplink
Waterbirth Island Dungeon sublevel 5	95		3	Maplink
Chaos Tunnels	95		16	Maplink

Drops

100% drop

	Item		Quantity	Rarity	GE Price	High Alch
	Bones		1	Always	246	0

Charms

Nothing	3	3	3	3
3%	78–80%	9–10%	6–7%	2%
Represents a 90% confidence range based on a sample of 6,372 kills. 3 items are dropped at a time. Add data to the log (requires JavaScript).

Main drop

	Item		Quantity	Rarity	GE Price	High Alch
	Water rune		1–39	Common	20-780	3-117
	Earth rune		1–40	Common	17-680	3-120
	Air talisman		1	Uncommon	777	2
	Mind talisman		1	Uncommon	226	2
	Fire talisman		1	Uncommon	348	2
	Cosmic talisman (m)		1	Rare	1,002	2
	Body talisman		1	Rare	384	2
	Water talisman		1	Uncommon	5,410	2
	Earth talisman		1	Uncommon	159	2
	Nature talisman (m)		1	Rare	1,982	2
	Chaos talisman (m)		1	Uncommon	2,581	2
	Huge plated steel salvage		1	Common	2,886	1,200
	Black claw		1	Common	4,709	108
	Off-hand black claw		1	Common	2,272	108
	Black platebody		1	Common	3,631	2,304
	Tiny bladed mithril salvage		1	Common	2,025	600
	Rock-shell gloves (m)		1	Uncommon	14,829	390
	Rock-shell boots (m)		1	Uncommon	11,225	390
	Black warhammer		1	Uncommon	4,886	764
	Off-hand black warhammer		1	Uncommon	2,973	764
	Small bladed adamant salvage		1	Uncommon	3,256	4,000
	Medium blunt adamant salvage		1	Rare	14,709	6,000
	Poison ivy seed (m)		1	Uncommon	602	99
	Belladonna seed (m)		1	Uncommon	992	106
	Guam seed (m)		1	Uncommon	578	2
	Marrentill seed (m)		1	Uncommon	508	3
	Tarromin seed (m)		1	Uncommon	492	4
	Harralander seed (m)		1	Uncommon	520	7
	Toadflax seed (m)		1	Uncommon	1,160	20
	Ranarr seed (m)		1	Rare	1,552	11
	Irit seed (m)		1	Rare	858	38
	Avantoe seed (m)		1	Rare	525	38
	Snapdragon seed (m)		1	Rare	657	38
	Cadantine seed (m)		1	Rare	1,338	38
	Lantadyme seed (m)		1	Rare	343	38
	Kwuarm seed (m)		1	Rare	24,469	38
	Dwarf weed seed (m)		1	Very rare	9,435	38
	Torstol seed (m)		1	Very rare	587	38
	Grimy guam		1	Uncommon	582	18
	Grimy marrentill (m)		1	Uncommon	9,244	0
	Grimy tarromin		1	Uncommon	196	0
	Grimy harralander (m)		1	Uncommon	1,759	0
	Grimy ranarr (m)		1	Rare	4,686	0
	Grimy irit (m)		1	Rare	2,726	0
	Grimy avantoe (m)		1	Rare	963	0
	Grimy kwuarm (m)		1	Rare	18,406	0
	Grimy cadantine (m)		1	Rare	6,049	0
	Grimy lantadyme (m)		1	Rare	8,391	0
	Grimy dwarf weed (m)		1	Rare	16,964	0
	Coins		23–137	Common	23-137	23-137
	Raw lobster		1	Common	402	170
	Raw bass (m)		1	Common	1,755	168
	Tinderbox		1	Common	684	0
	Casket (m)		1	Rare	940	30
	Rock-shell splinter (m)		1	Uncommon	3,457	36
	Rock-shell chunk (m)		1	Rare	1,951	36
	Rock-shell shard (m)		1	Rare	4,043	36

Tertiary drops

	Item		Quantity	Rarity	GE Price	High Alch
	Sealed clue scroll (medium) (m)		1	1/128	Not sold	Not alchemisable
	Starved ancient effigy (m)		1	Very rare	Not sold	Not alchemisable
	Rare drop table		1	Rare	Not sold	Not alchemisable

Rare drop table

This monster has access to the rare drop table.
Luck-enhancing items are not required to access the table, but they will increase the chance of accessing the rare drop table and may also improve the loot received from it.

Rare drop table:

Rare drop table Item Quantity Rarity GE price High alch value Coins 250–500 Common 250-500 250-500 Uncut sapphire 1 Common 813 15 Uncut emerald 1 Common 3,080 30 Uncut ruby 1 Common 1,601 60 Uncut diamond 1 Common 2,851 120 Uncut diamond 45–55 (noted) Rare 128,295-156,805 5,400-6,600 Loop half of a key (m) 1 Common 11,770 0 Tooth half of a key (m) 1 Common 11,796 0 Uncut dragonstone (m) 1 Uncommon 9,006 600 Uncut dragonstone (m) 45–55 (noted) Rare 405,270-495,330 27,000-33,000 Dragon longsword (m) 1 Common 57,880 60,000 Off-hand dragon longsword (m) 1 Common 57,833 60,000 Dragon spear (m) 1 Rare 35,478 37,440 Battlestaff (m) 180–220 (noted) Rare 565,740-691,460 756,000-924,000 Rune javelin 5 Rare 865 1,870 Huge plated rune salvage 1 Uncommon 38,769 40,000 Huge plated rune salvage 18–22 (noted) Rare 697,842-852,918 720,000-880,000 Shield left half (m) 1 Rare 65,315 66,000 Dragon helm (m) 1 Uncommon 58,765 60,000 Rune arrowheads 113–137 Common 14,464-17,536 678-822 Onyx bolts (m) 135–165 Very rare 1,061,505-1,297,395 1,104,165-1,349,535 Water talisman 68–82 (noted) Rare 367,880-443,620 136-164 Earth talisman 68–82 (noted) Rare 10,812-13,038 136-164 Raw lobster 135–165 (noted) Common 54,270-66,330 22,950-28,050 Raw shark (m) 225–275 (noted) Uncommon 449,550-549,450 40,500-49,500 Big bones 68–82 (noted) Uncommon 13,532-16,318 0 Dragon bones 180–220 (noted) Rare 256,860-313,940 0 Drakolith stone spirit (m) 25–35 Uncommon 7,900-11,060 Not alchemisable Necrite stone spirit (m) 2 Common 7,386 Not alchemisable Phasmatite stone spirit (m) 25–30 Uncommon 7,925-9,510 Not alchemisable Phasmatite stone spirit (m) 2 Common 634 Not alchemisable Necrite stone spirit (m) 25–30 Rare 92,325-110,790 Not alchemisable Runite stone spirit 3 Common 5,652 Not alchemisable Orichalcite stone spirit (m) 25–35 Rare 5,250-7,350 Not alchemisable Grimy torstol (m) 90–110 (noted) Uncommon 742,860-907,940 0 Grimy snapdragon (m) 90–110 (noted) Uncommon 146,880-179,520 0 Super restore (4) (m) 45–55 (noted) Uncommon 292,320-357,280 8,100-9,900 Prayer potion (4) 45–55 (noted) Uncommon 443,430-541,970 5,130-6,270 Lantadyme seed (m) 14–16 Uncommon 4,802-5,488 532-608 Dwarf weed seed (m) 14–16 Uncommon 132,090-150,960 532-608 Magic seed (m) 4 Uncommon 80,424 1,012 Palm tree seed (m) 10 Rare 154,340 1,520 Flax 450–550 (noted) Common 73,800-90,200 1,350-1,650 Molten glass (m) 45–55 (noted) Common 31,050-37,950 45-55 Soft clay 450–550 (noted) Uncommon 350,100-427,900 450-550 Yew logs 68–82 (noted) Uncommon 17,952-21,648 6,528-7,872 Yew logs 675–825 (noted) Rare 178,200-217,800 64,800-79,200 Teak plank (m) 45–55 (noted) Uncommon 27,315-33,385 13,500-16,500 Mahogany plank (m) 270–330 (noted) Rare 528,120-645,480 243,000-297,000 Vecna skull (m) 1 Rare 498,134 6,000 Cheese+tom batta (m) 1 Very rare 484 1 Blurberry Special (m) 1 Very rare 12,210 18 Hazelmere's signet ring (m) 1 Very rare 2,147,482,785 300,000 Brawling gloves (Melee) (m) 1 Very rare Not sold Not alchemisable Brawling gloves (Magic) (m) 1 Very rare Not sold Not alchemisable Brawling gloves (Ranged) (m) 1 Very rare Not sold Not alchemisable Brawling gloves (Agility) (m) 1 Very rare Not sold Not alchemisable Brawling gloves (Cooking) (m) 1 Very rare Not sold Not alchemisable Brawling gloves (FM) (m) 1 Very rare Not sold Not alchemisable Brawling gloves (Fishing) (m) 1 Very rare Not sold Not alchemisable Brawling gloves (Hunter) (m) 1 Very rare Not sold Not alchemisable Brawling gloves (Mining) (m) 1 Very rare Not sold Not alchemisable Brawling gloves (Prayer) (m) 1 Very rare Not sold Not alchemisable Brawling gloves (Smithing) (m) 1 Very rare Not sold Not alchemisable Brawling gloves (Thieving) (m) 1 Very rare Not sold Not alchemisable Brawling gloves (WC) (m) 1 Very rare Not sold Not alchemisable Crystal triskelion fragment 1 (m) 1 Very rare Not sold Not alchemisable Crystal triskelion fragment 2 (m) 1 Very rare Not sold Not alchemisable Crystal triskelion fragment 3 (m) 1 Very rare Not sold Not alchemisable

Universal drops

Universal drops are dropped by nearly every monster outside of Daemonheim.

These items are dropped alongside main drops.

	Item		Quantity	Rarity	GE Price	High Alch
	Key token		1	Rare	Not sold	Not alchemisable
	Mimic kill token (m)		1	Very rare	24,327	Not alchemisable

Update history

This information has been compiled as part of the update history project. Some updates may not be included - see here for how to help out!

• patch 14 January 2013 (Update):
  • Giant rock crabs found in Waterbirth Island dungeons have had their combat level reduced down to 136.

• patch 9 November 2010 (Update):
  • Giant rock crabs no longer mysteriously grow when awakened.

• update 1 August 2005 (Update):
  • Added to game.

Trivia

• After the 27 May 2009 update, giant rock crabs dropped Charms in groups of three instead of ten. This hidden update initially angered players, though complaints died down as the rate of charm dropping was also increased.