[FAQ] • [doc]

Giant rock crabs are massive versions of the weaker Rock crab. They lie in wait for prey, disguised as large boulders. When approached, they attack, unless they have become tolerant, in which case they remain as "boulders" - attempting to target them gives the message "Invalid target."

Giant Rock Crabs are good droppers of charms, as they drop 3 of them at a time. They also drop various black equipment (platebody and claws), worth a decent sum of coins. They are the only droppers of rock-shell parts, which are needed to create Rock-shell armour.


Chaos Tunnels entrances locations


Giant Rock Crabs have a fairly high resistance to Melee and Ranged attacks, and thus are only effectively killed using Magic.

In the Chaos Tunnels, they will eventually lose aggression. When they do, just leave the cave via the rope exit. Then just go straight back down the crevice.


The Giant Rock Crab is one of few monsters that will retreat from battle when they become critically wounded.


100% dropsEdit

Item Quantity Rarity GE price


No charmGold charmGreen charmCrimson charmBlue charm
Represents a 90% confidence range based on a sample of 6,143 kills.
3 charms are dropped at a time.
Add data to the log (requires JavaScript).

Main dropsEdit

Item Quantity Rarity GE price
Water runeWater rune1–39Common27–1,053
Earth runeEarth rune1–40Common20–800
Air talismanAir talisman1Uncommon239
Mind talismanMind talisman1Uncommon200
Fire talismanFire talisman1Uncommon1,540
Cosmic talismanCosmic talisman1Rare382
Body talismanBody talisman1Rare240
Water talismanWater talisman1Uncommon6,320
Earth talismanEarth talisman1Uncommon1,784
Nature talismanNature talisman1Rare1,432
Chaos talismanChaos talisman1Uncommon1,461
Steel platebodySteel platebody1Common2,092
Black clawBlack claw1Common[1]3,579
Off-hand black clawOff-hand black claw1Common[1]1,453
Black platebodyBlack platebody1Common2,062
Mithril hatchetMithril hatchet1Common1,713
Rock-shell glovesRock-shell gloves1Uncommon5,432
Rock-shell bootsRock-shell boots1Uncommon5,485
Black warhammerBlack warhammer1Uncommon1,755
Off-hand black warhammerOff-hand black warhammer1Uncommon873
Adamant longswordAdamant longsword1Uncommon4,790
Adamant warhammerAdamant warhammer1Rare3,103
Poison ivy seed 5Poison ivy seed1Uncommon183
Belladonna seed 5Belladonna seed1Uncommon483
Guam seed 5Guam seed1Uncommon14
Marrentill seed 5Marrentill seed1Uncommon19
Tarromin seed 5Tarromin seed1Uncommon26
Harralander seed 5Harralander seed1Uncommon44
Toadflax seed 5Toadflax seed1Uncommon3,003
Ranarr seed 5Ranarr seed1Rare1,682
Irit seed 5Irit seed1Rare706
Avantoe seed 5Avantoe seed1Rare412
Snapdragon seed 5Snapdragon seed1Rare472
Cadantine seed 5Cadantine seed1Rare1,494
Lantadyme seed 5Lantadyme seed1Rare664
Kwuarm seed 5Kwuarm seed1Rare7,967
Dwarf weed seed 5Dwarf weed seed1Very rare700
Torstol seed 5Torstol seed1Very rare1,169
Grimy guamGrimy guam1Uncommon282
Grimy marrentillGrimy marrentill1Uncommon294
Grimy tarrominGrimy tarromin1Uncommon33
Grimy harralanderGrimy harralander1Uncommon76
Grimy ranarrGrimy ranarr1Rare2,272
Grimy iritGrimy irit1Rare3,080
Grimy avantoeGrimy avantoe1Rare1,554
Grimy kwuarmGrimy kwuarm1Rare4,985
Grimy cadantineGrimy cadantine1Rare2,920
Grimy lantadymeGrimy lantadyme1Rare2,864
Grimy dwarf weedGrimy dwarf weed1Rare2,136
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common222
Raw bassRaw bass1Common465
Rock-shell splinterRock-shell splinter1Uncommon2,629
Rock-shell chunkRock-shell chunk1Rare2,043
Rock-shell shardRock-shell shard1Rare6,063
  1. ^ a b Main hand and off hand claws are dropped together.

Tertiary dropsEdit

Item Quantity Rarity GE price
Sealed clue scroll (medium)Sealed clue scroll (medium)1Very rareNot sold
Starved ancient effigyStarved ancient effigy1Very rareNot sold

Rare drop table dropsEdit

This monster has access to the rare drop table.
Luck-enhancing items such as a ring of wealth or luck of the dwarves are not required to access the table.
Show/hide rare drop table
Item Quantity Rarity GE price
Coins 250Coins250–500Common250–500
Uncut sapphireUncut sapphire1Common885
Uncut emeraldUncut emerald1Common2,048
Uncut rubyUncut ruby1Common1,844
Uncut diamondUncut diamond1Common3,614
Uncut diamondUncut diamond45–55 (noted)Rare162,630–198,770
Loop half of a keyLoop half of a key1Common17,967
Tooth half of a keyTooth half of a key1Common21,105
Uncut dragonstoneUncut dragonstone1Uncommon11,722
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare527,490–644,710
Dragon longswordDragon longsword1Common57,908
Dragon spearDragon spear1Rare35,867
BattlestaffBattlestaff180–220 (noted)Rare1,104,660–1,350,140
Rune javelinRune javelin5Rare880
Rune platebodyRune platebody1Uncommon37,639
Rune platebodyRune platebody15–25 (noted)Rare564,585–940,975
Shield left halfShield left half1Rare65,160
Dragon helmDragon helm1Uncommon58,595
Rune arrowheads 5Rune arrowheads113–137Common26,781–32,469
Onyx bolts 5Onyx bolts135–165Very rare1,059,750–1,295,250
Chaos talismanChaos talisman1Rare1,461
Nature talismanNature talisman1Rare1,432
Water talismanWater talisman65–82 (noted)Rare410,800–518,240
Earth talismanEarth talisman65–82 (noted)Rare115,960–146,288
Fire talismanFire talisman25–35 (noted)Rare38,500–53,900
Raw lobsterRaw lobster135–165 (noted)Common29,970–36,630
Raw sharkRaw shark225–275 (noted)Uncommon266,850–326,150
Big bonesBig bones68–82 (noted)Uncommon13,668–16,482
Dragon bonesDragon bones180–220 (noted)Rare321,840–393,360
CoalCoal200–1,100 (noted)Uncommon27,800–152,900
Gold oreGold ore90–110 (noted)Common15,300–18,700
Adamantite oreAdamantite ore180–220 (noted)Uncommon216,720–264,880
Adamant barAdamant bar14–16 (noted)Common39,816–45,504
Adamant barAdamant bar135–165 (noted)Rare383,940–469,260
Runite oreRunite ore90–110 (noted)Rare1,082,880–1,323,520
Rune barRune bar(noted)Common42,060
Rune barRune bar45–55 (noted)Rare630,900–771,100
Grimy torstolGrimy torstol90–110 (noted)Uncommon341,550–417,450
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon181,620–221,980
Super restore (4)Super restore (4)45–55 (noted)Uncommon190,800–233,200
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon169,650–207,350
Lantadyme seed 5Lantadyme seed14–16Uncommon9,296–10,624
Dwarf weed seed 5Dwarf weed seed14–16Uncommon9,800–11,200
Magic seed 5Magic seed4Uncommon438,480
Palm tree seed 5Palm tree seed10Rare1,048,570
FlaxFlax450–550 (noted)Common15,750–19,250
Molten glassMolten glass45–55 (noted)Common13,770–16,830
Soft claySoft clay450–550 (noted)Uncommon213,300–260,700
Yew logsYew logs68–82 (noted)Uncommon13,192–15,908
Yew logsYew logs675–825 (noted)Rare130,950–160,050
Teak plankTeak plank45–55 (noted)Uncommon33,840–41,360
Mahogany plankMahogany plank270–330 (noted)Rare389,880–476,520
Blurberry specialBlurberry special1Uncommon2,615
Vecna skullVecna skull1Very rare*268,789
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,885,212,297
Brawling gloves (Melee)Brawling gloves (Melee)1Very rareNot sold
Brawling gloves (Magic)Brawling gloves (Magic)1Very rareNot sold
Brawling gloves (Ranged)Brawling gloves (Ranged)1Very rareNot sold
Brawling gloves (Agility)Brawling gloves (Agility)1Very rareNot sold
Brawling gloves (Cooking)Brawling gloves (Cooking)1Very rareNot sold
Brawling gloves (FM)Brawling gloves (FM)1Very rareNot sold
Brawling gloves (Fishing)Brawling gloves (Fishing)1Very rareNot sold
Brawling gloves (Hunter)Brawling gloves (Hunter)1Very rareNot sold
Brawling gloves (Mining)Brawling gloves (Mining)1Very rareNot sold
Brawling gloves (Prayer)Brawling gloves (Prayer)1Very rareNot sold
Brawling gloves (Smithing)Brawling gloves (Smithing)1Very rareNot sold
Brawling gloves (Thieving)Brawling gloves (Thieving)1Very rareNot sold
Brawling gloves (WC)Brawling gloves (WC)1Very rareNot sold
Crystal triskelion fragment 1Crystal triskelion fragment 11Very rareNot sold
Crystal triskelion fragment 2Crystal triskelion fragment 21Very rareNot sold
Crystal triskelion fragment 3Crystal triskelion fragment 31Very rareNot sold

Universal dropsEdit

Universal drops are dropped by nearly every monster outside of Daemonheim.
These drops are dropped alongside main drops.
Item Quantity Rarity GE price
Key tokenKey token1RareNot sold
Mimic kill tokenMimic kill token1Very rare37,153


  • 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.