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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
BonesBones1Always198

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 rune1–39Common24–936
Earth runeEarth rune1–40Common20–800
Air talismanAir talisman1Uncommon383
Mind talismanMind talisman1Uncommon279
Fire talismanFire talisman1Uncommon636
Cosmic talismanCosmic talisman1Rare403
Body talismanBody talisman1Rare431
Water talismanWater talisman1Uncommon5,378
Earth talismanEarth talisman1Uncommon660
Nature talismanNature talisman1Rare812
Chaos talismanChaos talisman1Uncommon1,085
Steel platebodySteel platebody1Common1,956
Black clawBlack claw1Common[1]2,779
Off-hand black clawOff-hand black claw1Common[1]1,397
Black platebodyBlack platebody1Common4,119
Mithril hatchetMithril hatchet1Common5,715
Rock-shell glovesRock-shell gloves1Uncommon6,713
Rock-shell bootsRock-shell boots1Uncommon5,511
Black warhammerBlack warhammer1Uncommon2,921
Off-hand black warhammerOff-hand black warhammer1Uncommon1,418
Adamant longswordAdamant longsword1Uncommon4,917
Adamant warhammerAdamant warhammer1Rare3,567
Poison ivy seed 5Poison ivy seed1Uncommon124
Belladonna seed 5Belladonna seed1Uncommon662
Guam seed 5Guam seed1Uncommon110
Marrentill seed 5Marrentill seed1Uncommon57
Tarromin seed 5Tarromin seed1Uncommon87
Harralander seed 5Harralander seed1Uncommon122
Toadflax seed 5Toadflax seed1Uncommon2,564
Ranarr seed 5Ranarr seed1Rare800
Irit seed 5Irit seed1Rare482
Avantoe seed 5Avantoe seed1Rare306
Snapdragon seed 5Snapdragon seed1Rare268
Cadantine seed 5Cadantine seed1Rare1,051
Lantadyme seed 5Lantadyme seed1Rare343
Kwuarm seed 5Kwuarm seed1Rare9,222
Dwarf weed seed 5Dwarf weed seed1Very rare325
Torstol seed 5Torstol seed1Very rare760
Grimy guamGrimy guam1Uncommon342
Grimy marrentillGrimy marrentill1Uncommon895
Grimy tarrominGrimy tarromin1Uncommon56
Grimy harralanderGrimy harralander1Uncommon98
Grimy ranarrGrimy ranarr1Rare1,447
Grimy iritGrimy irit1Rare3,743
Grimy avantoeGrimy avantoe1Rare731
Grimy kwuarmGrimy kwuarm1Rare6,118
Grimy cadantineGrimy cadantine1Rare2,311
Grimy lantadymeGrimy lantadyme1Rare4,817
Grimy dwarf weedGrimy dwarf weed1Rare3,872
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common194
Raw bassRaw bass1Common1,092
TinderboxTinderbox1Common258
CasketCasket1Rare1,702
Rock-shell splinterRock-shell splinter1Uncommon3,283
Rock-shell chunkRock-shell chunk1Rare2,045
Rock-shell shardRock-shell shard1Rare5,099
  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 sapphire1Common376
Uncut emeraldUncut emerald1Common807
Uncut rubyUncut ruby1Common1,082
Uncut diamondUncut diamond1Common2,259
Uncut diamondUncut diamond45–55 (noted)Rare101,655–124,245
Loop half of a keyLoop half of a key1Common11,050
Tooth half of a keyTooth half of a key1Common13,531
Uncut dragonstoneUncut dragonstone1Uncommon11,533
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare518,985–634,315
Dragon longswordDragon longsword1Common58,138
Dragon spearDragon spear1Rare36,734
BattlestaffBattlestaff180–220 (noted)Rare899,460–1,099,340
Rune javelinRune javelin5Rare905
Rune platebodyRune platebody1Uncommon37,480
Rune platebodyRune platebody15–25 (noted)Rare562,200–937,000
Shield left halfShield left half1Rare65,079
Dragon helmDragon helm1Uncommon59,049
Rune arrowheads 5Rune arrowheads113–137Common15,255–18,495
Onyx bolts 5Onyx bolts135–165Very rare1,085,535–1,326,765
Chaos talismanChaos talisman1Rare1,085
Nature talismanNature talisman1Rare812
Water talismanWater talisman65–82 (noted)Rare349,570–440,996
Earth talismanEarth talisman65–82 (noted)Rare42,900–54,120
Fire talismanFire talisman25–35 (noted)Rare15,900–22,260
Raw lobsterRaw lobster135–165 (noted)Common26,190–32,010
Raw sharkRaw shark225–275 (noted)Uncommon187,650–229,350
Big bonesBig bones68–82 (noted)Uncommon11,560–13,940
Dragon bonesDragon bones180–220 (noted)Rare355,140–434,060
CoalCoal200–1,100 (noted)Uncommon24,600–135,300
Gold oreGold ore90–110 (noted)Common22,140–27,060
Adamantite oreAdamantite ore180–220 (noted)Uncommon51,660–63,140
Adamant barAdamant bar14–16 (noted)Common23,982–27,408
Adamant barAdamant bar135–165 (noted)Rare231,255–282,645
Runite oreRunite ore90–110 (noted)Rare105,210–128,590
Rune barRune bar(noted)Common7,662
Rune barRune bar45–55 (noted)Rare114,930–140,470
Grimy torstolGrimy torstol90–110 (noted)Uncommon376,110–459,690
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon133,290–162,910
Super restore (4)Super restore (4)45–55 (noted)Uncommon155,880–190,520
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon117,675–143,825
Lantadyme seed 5Lantadyme seed14–16Uncommon4,802–5,488
Dwarf weed seed 5Dwarf weed seed14–16Uncommon4,550–5,200
Magic seed 5Magic seed4Uncommon77,952
Palm tree seed 5Palm tree seed10Rare273,180
FlaxFlax450–550 (noted)Common34,200–41,800
Molten glassMolten glass45–55 (noted)Common9,945–12,155
Soft claySoft clay450–550 (noted)Uncommon344,700–421,300
Yew logsYew logs68–82 (noted)Uncommon12,784–15,416
Yew logsYew logs675–825 (noted)Rare126,900–155,100
Teak plankTeak plank45–55 (noted)Uncommon16,920–20,680
Mahogany plankMahogany plank270–330 (noted)Rare225,990–276,210
Blurberry SpecialBlurberry Special1Uncommon8,185
Vecna skullVecna skull1Very rare*211,111
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,848,679,360
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 rare9,299

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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