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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.

Locations

Chaos Tunnels entrances locations

Strategy

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.

Retreat

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

Drops

100% drops

Item Quantity Rarity GE price
BonesBones1Always174

Charms

No charmGold charmGreen charmCrimson charmBlue charm
2–3%79–80%9–10%6–7%2%
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 drops

Item Quantity Rarity GE price
Water runeWater rune1–39Common19–741
Earth runeEarth rune1–40Common17–680
Air talismanAir talisman1Uncommon339
Mind talismanMind talisman1Uncommon285
Fire talismanFire talisman1Uncommon309
Cosmic talismanCosmic talisman1Rare495
Body talismanBody talisman1Rare313
Water talismanWater talisman1Uncommon3,873
Earth talismanEarth talisman1Uncommon184
Nature talismanNature talisman1Rare1,190
Chaos talismanChaos talisman1Uncommon1,405
Steel platebodySteel platebody1Common1,956
Black clawBlack claw1Common[1]3,098
Off-hand black clawOff-hand black claw1Common[1]1,583
Black platebodyBlack platebody1Common4,500
Mithril hatchetMithril hatchet1Common6,424
Rock-shell glovesRock-shell gloves1Uncommon7,009
Rock-shell bootsRock-shell boots1Uncommon5,759
Black warhammerBlack warhammer1Uncommon3,538
Off-hand black warhammerOff-hand black warhammer1Uncommon1,842
Adamant longswordAdamant longsword1Uncommon4,917
Adamant warhammerAdamant warhammer1Rare3,567
Poison ivy seed 5Poison ivy seed1Uncommon94
Belladonna seed 5Belladonna seed1Uncommon978
Guam seed 5Guam seed1Uncommon168
Marrentill seed 5Marrentill seed1Uncommon152
Tarromin seed 5Tarromin seed1Uncommon86
Harralander seed 5Harralander seed1Uncommon133
Toadflax seed 5Toadflax seed1Uncommon1,508
Ranarr seed 5Ranarr seed1Rare1,089
Irit seed 5Irit seed1Rare872
Avantoe seed 5Avantoe seed1Rare441
Snapdragon seed 5Snapdragon seed1Rare398
Cadantine seed 5Cadantine seed1Rare1,289
Lantadyme seed 5Lantadyme seed1Rare1,016
Kwuarm seed 5Kwuarm seed1Rare30,765
Dwarf weed seed 5Dwarf weed seed1Very rare849
Torstol seed 5Torstol seed1Very rare1,606
Grimy guamGrimy guam1Uncommon383
Grimy marrentillGrimy marrentill1Uncommon2,972
Grimy tarrominGrimy tarromin1Uncommon100
Grimy harralanderGrimy harralander1Uncommon171
Grimy ranarrGrimy ranarr1Rare2,215
Grimy iritGrimy irit1Rare4,337
Grimy avantoeGrimy avantoe1Rare1,298
Grimy kwuarmGrimy kwuarm1Rare13,077
Grimy cadantineGrimy cadantine1Rare2,944
Grimy lantadymeGrimy lantadyme1Rare10,154
Grimy dwarf weedGrimy dwarf weed1Rare10,299
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common479
Raw bassRaw bass1Common1,412
TinderboxTinderbox1Common175
CasketCasket1Rare730
Rock-shell splinterRock-shell splinter1Uncommon3,433
Rock-shell chunkRock-shell chunk1Rare1,998
Rock-shell shardRock-shell shard1Rare4,947
  1. ^ a b Main hand and off hand claws are dropped together.

Tertiary drops

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 drops

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 sapphire1Common409
Uncut emeraldUncut emerald1Common817
Uncut rubyUncut ruby1Common1,200
Uncut diamondUncut diamond1Common2,763
Uncut diamondUncut diamond45–55 (noted)Rare124,335–151,965
Loop half of a keyLoop half of a key1Common12,138
Tooth half of a keyTooth half of a key1Common15,879
Uncut dragonstoneUncut dragonstone1Uncommon12,537
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare564,165–689,535
Dragon longswordDragon longsword1Common57,895
Dragon spearDragon spear1Rare34,843
BattlestaffBattlestaff180–220 (noted)Rare654,660–800,140
Rune javelinRune javelin5Rare910
Rune platebodyRune platebody1Uncommon37,480
Rune platebodyRune platebody15–25 (noted)Rare562,200–937,000
Shield left halfShield left half1Rare65,210
Dragon helmDragon helm1Uncommon59,038
Rune arrowheads 5Rune arrowheads113–137Common14,690–17,810
Onyx bolts 5Onyx bolts135–165Very rare1,064,340–1,300,860
Chaos talismanChaos talisman1Rare1,405
Nature talismanNature talisman1Rare1,190
Water talismanWater talisman65–82 (noted)Rare251,745–317,586
Earth talismanEarth talisman65–82 (noted)Rare11,960–15,088
Fire talismanFire talisman25–35 (noted)Rare7,725–10,815
Raw lobsterRaw lobster135–165 (noted)Common64,665–79,035
Raw sharkRaw shark225–275 (noted)Uncommon198,675–242,825
Big bonesBig bones68–82 (noted)Uncommon11,084–13,366
Dragon bonesDragon bones180–220 (noted)Rare331,380–405,020
CoalCoal200–1,100 (noted)Uncommon23,400–128,700
Gold oreGold ore90–110 (noted)Common32,310–39,490
Adamantite oreAdamantite ore180–220 (noted)Uncommon44,460–54,340
Adamant barAdamant bar14–16 (noted)Common19,502–22,288
Adamant barAdamant bar135–165 (noted)Rare188,055–229,845
Runite oreRunite ore90–110 (noted)Rare91,710–112,090
Rune barRune bar(noted)Common6,375
Rune barRune bar45–55 (noted)Rare95,625–116,875
Grimy torstolGrimy torstol90–110 (noted)Uncommon653,490–798,710
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon174,960–213,840
Super restore (4)Super restore (4)45–55 (noted)Uncommon179,370–219,230
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon185,310–226,490
Lantadyme seed 5Lantadyme seed14–16Uncommon14,224–16,256
Dwarf weed seed 5Dwarf weed seed14–16Uncommon11,886–13,584
Magic seed 5Magic seed4Uncommon208,956
Palm tree seed 5Palm tree seed10Rare535,860
FlaxFlax450–550 (noted)Common40,950–50,050
Molten glassMolten glass45–55 (noted)Common11,385–13,915
Soft claySoft clay450–550 (noted)Uncommon262,800–321,200
Yew logsYew logs68–82 (noted)Uncommon11,900–14,350
Yew logsYew logs675–825 (noted)Rare118,125–144,375
Teak plankTeak plank45–55 (noted)Uncommon16,110–19,690
Mahogany plankMahogany plank270–330 (noted)Rare240,570–294,030
Blurberry SpecialBlurberry Special1Uncommon16,746
Vecna skullVecna skull1Very rare*71,223
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,590,640,621
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 drops

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 rare8,968

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.
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