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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 market price


Item Quantity Rarity GE market price
Water runeWater rune1–39Common20–780
Earth runeEarth rune1–40Common15–600
Air talismanAir talisman1Uncommon212
Mind talismanMind talisman1Uncommon299
Fire talismanFire talisman1Uncommon1,675
Cosmic talismanCosmic talisman1Rare474
Body talismanBody talisman1Rare289
Water talismanWater talisman1Uncommon8,088
Earth talismanEarth talisman1Uncommon2,039
Nature talismanNature talisman1Rare738
Chaos talismanChaos talisman1Uncommon784


Item Quantity Rarity GE market price
Steel platebodySteel platebody1Common1,478
Black clawBlack claw1Common[1]183
Off-hand black clawOff-hand black claw1Common[1]534
Black platebodyBlack platebody1Common1,853
Mithril hatchetMithril hatchet1Common120
Rock-shell glovesRock-shell gloves1Uncommon15,321
Rock-shell bootsRock-shell boots1Uncommon16,010
Black warhammerBlack warhammer1Uncommon701
Off-hand black warhammerOff-hand black warhammer1Uncommon322
Adamant longswordAdamant longsword1Uncommon1,461
Adamant warhammerAdamant warhammer1Rare2,503
  1. ^ a b Main hand and off hand claws are dropped together.


Charm drop numbers
No charmGold charmGreen charmCrimson charmBlue charm
Represents a 90% confidence range.
Based on a sample of 6,007 kills.
3 charms are dropped at a time.
Add data to the log
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Item Quantity Rarity GE market price
Poison ivy seed 5Poison ivy seed1Uncommon31
Belladonna seed 5Belladonna seed1Uncommon275
Herb seed 5Guam seed1Uncommon12
Herb seed 5Marrentill seed1Uncommon12
Herb seed 5Tarromin seed1Uncommon8
Herb seed 5Harralander seed1Uncommon24
Herb seed 5Toadflax seed1Uncommon415
Herb seed 5Ranarr seed1Rare801
Herb seed 5Irit seed1Rare197
Herb seed 5Avantoe seed1Rare320
Herb seed 5Snapdragon seed1Rare291
Herb seed 5Cadantine seed1Rare1,047
Herb seed 5Lantadyme seed1Rare3,357
Herb seed 5Kwuarm seed1Rare1,048
Herb seed 5Dwarf weed seed1Very rare4,533
Herb seed 5Torstol seed1Very rare3,054


Item Quantity Rarity GE market price
Grimy guamGrimy guam1Uncommon233
Grimy marrentillGrimy marrentill1Uncommon202
Grimy tarrominGrimy tarromin1Uncommon53
Grimy harralanderGrimy harralander1Uncommon149
Grimy ranarrGrimy ranarr1Rare2,249
Grimy iritGrimy irit1Rare1,668
Grimy avantoeGrimy avantoe1Rare3,535
Grimy kwuarmGrimy kwuarm1Rare4,828
Grimy cadantineGrimy cadantine1Rare5,002
Grimy lantadymeGrimy lantadyme1Rare4,652
Grimy dwarf weedGrimy dwarf weed1Rare4,817


Item Quantity Rarity GE market price
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common169
Raw bassRaw bass1Common357
Rock-shell splinterRock-shell splinter1Uncommon13,259
Rock-shell chunkRock-shell chunk1Rare9,027
Rock-shell shardRock-shell shard1Rare8,721
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.
The ring of wealth is not required to access the table.
Show/hide rare drop table
Item Quantity Rarity GE market price
Coins 1000Coins250–500; 3,000Common250–3,000
Uncut sapphireUncut sapphire1Common827
Uncut emeraldUncut emerald1Common1,337
Uncut rubyUncut ruby1Common2,242
Uncut diamondUncut diamond1Common3,958
Uncut diamondUncut diamond45–55 (noted)Rare178,110–217,690
Loop half of a keyLoop half of a key1Uncommon17,583
Tooth half of a keyTooth half of a key1Uncommon32,818
Uncut dragonstoneUncut dragonstone1Uncommon11,995
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare539,775–659,725
Dragon longswordDragon longsword1Common57,591
Dragon spearDragon spear1Uncommon36,333
BattlestaffBattlestaff180–220 (noted)Uncommon1,314,000–1,606,000
Rune javelinRune javelin5Rare895
Rune platebodyRune platebody1Uncommon37,882
Rune platebodyRune platebody15–25 (noted)Rare568,230–947,050
Shield left halfShield left half1Uncommon64,902
Dragon helmDragon helm1Uncommon59,102
Rune arrowheads 5Rune arrowheads113–137Common21,470–26,030
Onyx bolts 5Onyx bolts135–165Rare1,114,560–1,362,240
Vecna skullVecna skull1Uncommon52,293
Chaos talismanChaos talisman1Uncommon784
Nature talismanNature talisman1Uncommon738
Water talismanWater talisman65–82 (noted)Rare525,720–663,216
Earth talismanEarth talisman65–82 (noted)Rare132,535–167,198
Fire talismanFire talisman25–35 (noted)Rare41,875–58,625
Raw lobsterRaw lobster135–165 (noted)Uncommon22,815–27,885
Raw sharkRaw shark225–275 (noted)Uncommon236,700–289,300
Big bonesBig bones79–90 (noted)Uncommon29,072–33,120
Dragon bonesDragon bones180–220 (noted)Uncommon495,900–606,100
CoalCoal200–1,100 (noted)Uncommon82,200–452,100
Gold oreGold ore90–110 (noted)Common11,520–14,080
Adamantite oreAdamantite ore180–220 (noted)Uncommon247,680–302,720
Adamant barAdamant bar15 (noted)Common40,455
Adamant barAdamant bar135–165 (noted)Rare364,095–445,005
Runite oreRunite ore90–110 (noted)Rare912,870–1,115,730
Rune barRune bar3 (noted)Common42,942
Rune barRune bar45–55 (noted)Rare644,130–787,270
Grimy torstolGrimy torstol90–110 (noted)Uncommon418,950–512,050
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon296,640–362,560
Super restore (4)Super restore (4)45–55 (noted)Uncommon183,690–224,510
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon128,430–156,970
Herb seed 5Lantadyme seed14–16Uncommon46,998–53,712
Herb seed 5Dwarf weed seed14–16Uncommon63,462–72,528
Magic seed 5Magic seed4Uncommon406,288
Palm tree seed 5Palm tree seed10Rare1,418,490
FlaxFlax450–550 (noted)Common9,450–11,550
Molten glassMolten glass45–55 (noted)Common5,985–7,315
Soft claySoft clay450–550 (noted)Uncommon162,450–198,550
Yew logsYew logs68–82Uncommon14,280–17,220
Yew logsYew logs675–825 (noted)Rare141,750–173,250
Teak plankTeak plank45–55 (noted)Uncommon27,045–33,055
Mahogany plankMahogany plank270–330 (noted)Rare556,470–680,130
Brawling gloves (Melee)Brawling gloves (Melee)1RareNot sold
Brawling gloves (Magic)Brawling gloves (Magic)1RareNot sold
Brawling gloves (Ranged)Brawling gloves (Ranged)1RareNot sold
Brawling gloves (Agility)Brawling gloves (Agility)1RareNot sold
Brawling gloves (Cooking)Brawling gloves (Cooking)1RareNot sold
Brawling gloves (FM)Brawling gloves (FM)1RareNot sold
Brawling gloves (Fishing)Brawling gloves (Fishing)1RareNot sold
Brawling gloves (Hunter)Brawling gloves (Hunter)1RareNot sold
Brawling gloves (Mining)Brawling gloves (Mining)1RareNot sold
Brawling gloves (Prayer)Brawling gloves (Prayer)1RareNot sold
Brawling gloves (Smithing)Brawling gloves (Smithing)1RareNot sold
Brawling gloves (Thieving)Brawling gloves (Thieving)1RareNot sold
Brawling gloves (WC)Brawling gloves (WC)1RareNot 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 market 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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