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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
BonesBones1Always166

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 rune1–39Common20–780
Earth runeEarth rune1–40Common19–760
Air talismanAir talisman1Uncommon228
Mind talismanMind talisman1Uncommon227
Fire talismanFire talisman1Uncommon310
Cosmic talismanCosmic talisman1Rare510
Body talismanBody talisman1Rare362
Water talismanWater talisman1Uncommon3,750
Earth talismanEarth talisman1Uncommon238
Nature talismanNature talisman1Rare790
Chaos talismanChaos talisman1Uncommon1,218
Steel platebodySteel platebody1Common1,956
Black clawBlack claw1Common[1]2,953
Off-hand black clawOff-hand black claw1Common[1]1,501
Black platebodyBlack platebody1Common4,815
Mithril hatchetMithril hatchet1Common5,967
Rock-shell glovesRock-shell gloves1Uncommon7,037
Rock-shell bootsRock-shell boots1Uncommon5,621
Black warhammerBlack warhammer1Uncommon3,121
Off-hand black warhammerOff-hand black warhammer1Uncommon1,582
Adamant longswordAdamant longsword1Uncommon4,917
Adamant warhammerAdamant warhammer1Rare3,567
Poison ivy seed 5Poison ivy seed1Uncommon78
Belladonna seed 5Belladonna seed1Uncommon485
Guam seed 5Guam seed1Uncommon105
Marrentill seed 5Marrentill seed1Uncommon81
Tarromin seed 5Tarromin seed1Uncommon73
Harralander seed 5Harralander seed1Uncommon89
Toadflax seed 5Toadflax seed1Uncommon2,049
Ranarr seed 5Ranarr seed1Rare499
Irit seed 5Irit seed1Rare447
Avantoe seed 5Avantoe seed1Rare272
Snapdragon seed 5Snapdragon seed1Rare222
Cadantine seed 5Cadantine seed1Rare929
Lantadyme seed 5Lantadyme seed1Rare341
Kwuarm seed 5Kwuarm seed1Rare6,820
Dwarf weed seed 5Dwarf weed seed1Very rare296
Torstol seed 5Torstol seed1Very rare864
Grimy guamGrimy guam1Uncommon340
Grimy marrentillGrimy marrentill1Uncommon2,906
Grimy tarrominGrimy tarromin1Uncommon50
Grimy harralanderGrimy harralander1Uncommon104
Grimy ranarrGrimy ranarr1Rare1,217
Grimy iritGrimy irit1Rare3,059
Grimy avantoeGrimy avantoe1Rare695
Grimy kwuarmGrimy kwuarm1Rare5,809
Grimy cadantineGrimy cadantine1Rare1,841
Grimy lantadymeGrimy lantadyme1Rare4,425
Grimy dwarf weedGrimy dwarf weed1Rare3,801
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common193
Raw bassRaw bass1Common1,244
TinderboxTinderbox1Common237
CasketCasket1Rare1,040
Rock-shell splinterRock-shell splinter1Uncommon3,283
Rock-shell chunkRock-shell chunk1Rare2,045
Rock-shell shardRock-shell shard1Rare4,988
  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 sapphire1Common348
Uncut emeraldUncut emerald1Common712
Uncut rubyUncut ruby1Common1,165
Uncut diamondUncut diamond1Common2,529
Uncut diamondUncut diamond45–55 (noted)Rare113,805–139,095
Loop half of a keyLoop half of a key1Common10,558
Tooth half of a keyTooth half of a key1Common14,209
Uncut dragonstoneUncut dragonstone1Uncommon12,064
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare542,880–663,520
Dragon longswordDragon longsword1Common58,255
Dragon spearDragon spear1Rare36,639
BattlestaffBattlestaff180–220 (noted)Rare764,100–933,900
Rune javelinRune javelin5Rare905
Rune platebodyRune platebody1Uncommon37,480
Rune platebodyRune platebody15–25 (noted)Rare562,200–937,000
Shield left halfShield left half1Rare64,888
Dragon helmDragon helm1Uncommon59,043
Rune arrowheads 5Rune arrowheads113–137Common15,481–18,769
Onyx bolts 5Onyx bolts135–165Very rare1,069,740–1,307,460
Chaos talismanChaos talisman1Rare1,218
Nature talismanNature talisman1Rare790
Water talismanWater talisman65–82 (noted)Rare243,750–307,500
Earth talismanEarth talisman65–82 (noted)Rare15,470–19,516
Fire talismanFire talisman25–35 (noted)Rare7,750–10,850
Raw lobsterRaw lobster135–165 (noted)Common26,055–31,845
Raw sharkRaw shark225–275 (noted)Uncommon177,750–217,250
Big bonesBig bones68–82 (noted)Uncommon10,404–12,546
Dragon bonesDragon bones180–220 (noted)Rare345,780–422,620
CoalCoal200–1,100 (noted)Uncommon21,600–118,800
Gold oreGold ore90–110 (noted)Common29,430–35,970
Adamantite oreAdamantite ore180–220 (noted)Uncommon40,680–49,720
Adamant barAdamant bar14–16 (noted)Common23,548–26,912
Adamant barAdamant bar135–165 (noted)Rare227,070–277,530
Runite oreRunite ore90–110 (noted)Rare105,930–129,470
Rune barRune bar(noted)Common7,911
Rune barRune bar45–55 (noted)Rare118,665–145,035
Grimy torstolGrimy torstol90–110 (noted)Uncommon377,730–461,670
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon116,190–142,010
Super restore (4)Super restore (4)45–55 (noted)Uncommon166,005–202,895
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon122,175–149,325
Lantadyme seed 5Lantadyme seed14–16Uncommon4,774–5,456
Dwarf weed seed 5Dwarf weed seed14–16Uncommon4,144–4,736
Magic seed 5Magic seed4Uncommon103,172
Palm tree seed 5Palm tree seed10Rare221,520
FlaxFlax450–550 (noted)Common38,700–47,300
Molten glassMolten glass45–55 (noted)Common10,305–12,595
Soft claySoft clay450–550 (noted)Uncommon277,200–338,800
Yew logsYew logs68–82 (noted)Uncommon11,016–13,284
Yew logsYew logs675–825 (noted)Rare109,350–133,650
Teak plankTeak plank45–55 (noted)Uncommon12,420–15,180
Mahogany plankMahogany plank270–330 (noted)Rare209,250–255,750
Blurberry SpecialBlurberry Special1Uncommon8,667
Vecna skullVecna skull1Very rare*159,163
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,671,277,144
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 rare9,242

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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