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Giant rock crab

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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

Use the middle south entrance just east of the wizard who teleports players to the Abyss. This is labelled entrance number 2 and goes directly to the giant rock crabs.


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.



Item Quantity Rarity GE price


Item Quantity Rarity GE price
Water runeWater rune1–39Common13–507
Earth runeEarth rune1–40Common12–480
Air talismanAir talisman1Uncommon237
Mind talismanMind talisman1Uncommon529
Fire talismanFire talisman1Uncommon1,527
Cosmic talismanCosmic talisman1Rare340
Body talismanBody talisman1Rare264
Water talismanWater talisman1Uncommon5,780
Earth talismanEarth talisman1Uncommon1,731
Nature talismanNature talisman1Rare991
Chaos talismanChaos talisman1Uncommon1,141


Item Quantity Rarity GE price
Steel platebodySteel platebody1Common1,789
Black clawBlack claw1Common[1]1,059
Off-hand black clawOff-hand black claw1Common[1]807
Black platebodyBlack platebody1Common2,054
Mithril hatchetMithril hatchet1Common1,101
Rock-shell glovesRock-shell gloves1Uncommon13,082
Rock-shell bootsRock-shell boots1Uncommon6,442
Black warhammerBlack warhammer1Uncommon1,251
Off-hand black warhammerOff-hand black warhammer1Uncommon400
Adamant longswordAdamant longsword1Uncommon4,029
Adamant warhammerAdamant warhammer1Rare2,720
  1. ^ a b Main hand and off hand claws are dropped together.


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
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Item Quantity Rarity GE price
Poison ivy seed 5Poison ivy seed1Uncommon81
Belladonna seed 5Belladonna seed1Uncommon468
Guam seed 5Guam seed1Uncommon10
Marrentill seed 5Marrentill seed1Uncommon10
Tarromin seed 5Tarromin seed1Uncommon19
Harralander seed 5Harralander seed1Uncommon13
Toadflax seed 5Toadflax seed1Uncommon948
Ranarr seed 5Ranarr seed1Rare986
Irit seed 5Irit seed1Rare416
Avantoe seed 5Avantoe seed1Rare279
Snapdragon seed 5Snapdragon seed1Rare493
Cadantine seed 5Cadantine seed1Rare5,132
Lantadyme seed 5Lantadyme seed1Rare999
Kwuarm seed 5Kwuarm seed1Rare5,225
Dwarf weed seed 5Dwarf weed seed1Very rare984
Torstol seed 5Torstol seed1Very rare3,260


Item Quantity Rarity GE price
Grimy guamGrimy guam1Uncommon93
Grimy marrentillGrimy marrentill1Uncommon124
Grimy tarrominGrimy tarromin1Uncommon36
Grimy harralanderGrimy harralander1Uncommon85
Grimy ranarrGrimy ranarr1Rare2,519
Grimy iritGrimy irit1Rare2,951
Grimy avantoeGrimy avantoe1Rare2,464
Grimy kwuarmGrimy kwuarm1Rare4,748
Grimy cadantineGrimy cadantine1Rare4,984
Grimy lantadymeGrimy lantadyme1Rare3,607
Grimy dwarf weedGrimy dwarf weed1Rare3,469


Item Quantity Rarity GE price
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common101
Raw bassRaw bass1Common224
Rock-shell splinterRock-shell splinter1Uncommon11,332
Rock-shell chunkRock-shell chunk1Rare8,399
Rock-shell shardRock-shell shard1Rare8,188
Clue scroll (medium)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.
A ring of wealth, luck potion or collector's insignia are not required to access the table.
Show/hide rare drop table
Item Quantity Rarity GE price
Coins 1000Coins250–500; 3,000Common250–3,000
Uncut sapphireUncut sapphire1Common875
Uncut emeraldUncut emerald1Common1,591
Uncut rubyUncut ruby1Common2,632
Uncut diamondUncut diamond1Common3,988
Uncut diamondUncut diamond45–55 (noted)Rare179,460–219,340
Loop half of a keyLoop half of a key1Common18,039
Tooth half of a keyTooth half of a key1Common25,579
Uncut dragonstoneUncut dragonstone1Uncommon11,862
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare533,790–652,410
Dragon longswordDragon longsword1Common57,639
Dragon spearDragon spear1Rare36,254
BattlestaffBattlestaff180–220 (noted)Rare1,267,020–1,548,580
Rune javelinRune javelin5Rare910
Rune platebodyRune platebody1Uncommon37,620
Rune platebodyRune platebody15–25 (noted)Rare564,300–940,500
Shield left halfShield left half1Rare63,809
Dragon helmDragon helm1Uncommon58,652
Rune arrowheads 5Rune arrowheads113–137Common19,662–23,838
Onyx bolts 5Onyx bolts135–165Very rare1,078,920–1,318,680
Vecna skullVecna skull1Very rare69,802
Chaos talismanChaos talisman1Rare1,141
Nature talismanNature talisman1Rare991
Water talismanWater talisman65–82 (noted)Rare375,700–473,960
Earth talismanEarth talisman65–82 (noted)Rare112,515–141,942
Fire talismanFire talisman25–35 (noted)Rare38,175–53,445
Raw lobsterRaw lobster135–165 (noted)Common13,635–16,665
Raw sharkRaw shark225–275 (noted)Uncommon234,450–286,550
Big bonesBig bones72–90 (noted)Uncommon26,352–32,940
Dragon bonesDragon bones180–220 (noted)Rare294,660–360,140
CoalCoal200–1,100 (noted)Uncommon36,400–200,200
Gold oreGold ore90–110 (noted)Common13,500–16,500
Adamantite oreAdamantite ore180–220 (noted)Uncommon227,700–278,300
Adamant barAdamant bar14–16 (noted)Common32,634–37,296
Adamant barAdamant bar135–165 (noted)Rare314,685–384,615
Runite oreRunite ore90–110 (noted)Rare1,031,760–1,261,040
Rune barRune bar(noted)Common41,886
Rune barRune bar45–55 (noted)Rare628,290–767,910
Grimy torstolGrimy torstol90–110 (noted)Uncommon387,180–473,220
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon351,450–429,550
Super restore (4)Super restore (4)45–55 (noted)Uncommon228,105–278,795
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon143,280–175,120
Lantadyme seed 5Lantadyme seed14–16Uncommon13,986–15,984
Dwarf weed seed 5Dwarf weed seed14–16Uncommon13,776–15,744
Magic seed 5Magic seed4Uncommon482,096
Palm tree seed 5Palm tree seed10Rare1,675,240
FlaxFlax450–550 (noted)Common4,500–5,500
Molten glassMolten glass45–55 (noted)Common9,720–11,880
Soft claySoft clay450–550 (noted)Uncommon175,050–213,950
Yew logsYew logs68–82Uncommon12,852–15,498
Yew logsYew logs675–825 (noted)Rare127,575–155,925
Teak plankTeak plank45–55 (noted)Uncommon29,025–35,475
Mahogany plankMahogany plank270–330 (noted)Rare565,920–691,680
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


  • 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.

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