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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.

LocationsEdit

Chaos Tunnels entrances locations

StrategyEdit

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.

RetreatEdit

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

DropsEdit

100% dropsEdit

Item Quantity Rarity GE price
BonesBones1Always254

CharmsEdit

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 dropsEdit

Item Quantity Rarity GE price
Water runeWater rune1–39Common31–1,209
Earth runeEarth rune1–40Common27–1,080
Air talismanAir talisman1Uncommon301
Mind talismanMind talisman1Uncommon315
Fire talismanFire talisman1Uncommon1,357
Cosmic talismanCosmic talisman1Rare312
Body talismanBody talisman1Rare296
Water talismanWater talisman1Uncommon5,604
Earth talismanEarth talisman1Uncommon2,010
Nature talismanNature talisman1Rare1,523
Chaos talismanChaos talisman1Uncommon1,144
Steel platebodySteel platebody1Common2,149
Black clawBlack claw1Common[1]2,871
Off-hand black clawOff-hand black claw1Common[1]1,252
Black platebodyBlack platebody1Common1,899
Mithril hatchetMithril hatchet1Common1,112
Rock-shell glovesRock-shell gloves1Uncommon7,129
Rock-shell bootsRock-shell boots1Uncommon4,597
Black warhammerBlack warhammer1Uncommon1,635
Off-hand black warhammerOff-hand black warhammer1Uncommon597
Adamant longswordAdamant longsword1Uncommon4,195
Adamant warhammerAdamant warhammer1Rare2,480
Poison ivy seed 5Poison ivy seed1Uncommon104
Belladonna seed 5Belladonna seed1Uncommon525
Guam seed 5Guam seed1Uncommon23
Marrentill seed 5Marrentill seed1Uncommon25
Tarromin seed 5Tarromin seed1Uncommon30
Harralander seed 5Harralander seed1Uncommon39
Toadflax seed 5Toadflax seed1Uncommon3,055
Ranarr seed 5Ranarr seed1Rare1,457
Irit seed 5Irit seed1Rare1,236
Avantoe seed 5Avantoe seed1Rare534
Snapdragon seed 5Snapdragon seed1Rare588
Cadantine seed 5Cadantine seed1Rare4,313
Lantadyme seed 5Lantadyme seed1Rare1,170
Kwuarm seed 5Kwuarm seed1Rare8,014
Dwarf weed seed 5Dwarf weed seed1Very rare1,127
Torstol seed 5Torstol seed1Very rare2,609
Grimy guamGrimy guam1Uncommon175
Grimy marrentillGrimy marrentill1Uncommon210
Grimy tarrominGrimy tarromin1Uncommon30
Grimy harralanderGrimy harralander1Uncommon81
Grimy ranarrGrimy ranarr1Rare3,329
Grimy iritGrimy irit1Rare3,412
Grimy avantoeGrimy avantoe1Rare2,143
Grimy kwuarmGrimy kwuarm1Rare5,378
Grimy cadantineGrimy cadantine1Rare5,049
Grimy lantadymeGrimy lantadyme1Rare3,802
Grimy dwarf weedGrimy dwarf weed1Rare2,588
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common137
Raw bassRaw bass1Common335
TinderboxTinderbox1Common384
CasketCasket1Rare2,249
Rock-shell splinterRock-shell splinter1Uncommon2,109
Rock-shell chunkRock-shell chunk1Rare1,807
Rock-shell shardRock-shell shard1Rare7,036
  1. ^ a b Main hand and off hand claws are dropped together.

Tertiary dropsEdit

Item Quantity Rarity GE price
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.
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 1000Coins250–500; 3,000Common250–3,000
Uncut sapphireUncut sapphire1Common1,076
Uncut emeraldUncut emerald1Common2,078
Uncut rubyUncut ruby1Common2,418
Uncut diamondUncut diamond1Common4,274
Uncut diamondUncut diamond45–55 (noted)Rare192,330–235,070
Loop half of a keyLoop half of a key1Common18,159
Tooth half of a keyTooth half of a key1Common22,004
Uncut dragonstoneUncut dragonstone1Uncommon12,166
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare547,470–669,130
Dragon longswordDragon longsword1Common55,578
Dragon spearDragon spear1Rare35,156
BattlestaffBattlestaff180–220 (noted)Rare1,226,160–1,498,640
Rune javelinRune javelin5Rare840
Rune platebodyRune platebody1Uncommon37,153
Rune platebodyRune platebody15–25 (noted)Rare557,295–928,825
Shield left halfShield left half1Rare65,544
Dragon helmDragon helm1Uncommon58,520
Rune arrowheads 5Rune arrowheads113–137Common18,419–22,331
Onyx bolts 5Onyx bolts135–165Very rare1,041,255–1,272,645
Chaos talismanChaos talisman1Rare1,144
Nature talismanNature talisman1Rare1,523
Water talismanWater talisman65–82 (noted)Rare364,260–459,528
Earth talismanEarth talisman65–82 (noted)Rare130,650–164,820
Fire talismanFire talisman25–35 (noted)Rare33,925–47,495
Raw lobsterRaw lobster135–165 (noted)Common18,495–22,605
Raw sharkRaw shark225–275 (noted)Uncommon314,775–384,725
Big bonesBig bones72–90 (noted)Uncommon27,432–34,290
Dragon bonesDragon bones180–220 (noted)Rare293,580–358,820
CoalCoal200–1,100 (noted)Uncommon32,000–176,000
Gold oreGold ore90–110 (noted)Common15,660–19,140
Adamantite oreAdamantite ore180–220 (noted)Uncommon210,960–257,840
Adamant barAdamant bar14–16 (noted)Common37,772–43,168
Adamant barAdamant bar135–165 (noted)Rare364,230–445,170
Runite oreRunite ore90–110 (noted)Rare986,310–1,205,490
Rune barRune bar(noted)Common41,313
Rune barRune bar45–55 (noted)Rare619,695–757,405
Grimy torstolGrimy torstol90–110 (noted)Uncommon394,650–482,350
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon304,920–372,680
Super restore (4)Super restore (4)45–55 (noted)Uncommon307,305–375,595
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon209,655–256,245
Lantadyme seed 5Lantadyme seed14–16Uncommon16,380–18,720
Dwarf weed seed 5Dwarf weed seed14–16Uncommon15,778–18,032
Magic seed 5Magic seed4Uncommon453,392
Palm tree seed 5Palm tree seed10Rare1,870,370
FlaxFlax450–550 (noted)Common8,550–10,450
Molten glassMolten glass45–55 (noted)Common15,120–18,480
Soft claySoft clay450–550 (noted)Uncommon297,900–364,100
Yew logsYew logs68–82Uncommon13,192–15,908
Yew logsYew logs675–825 (noted)Rare130,950–160,050
Teak plankTeak plank45–55 (noted)Uncommon44,190–54,010
Mahogany plankMahogany plank270–330 (noted)Rare611,550–747,450
Blurberry specialBlurberry special1Uncommon1,820
Vecna skullVecna skull1Very rare*246,534
Hazelmere's signet ringHazelmere's signet ring1Very rare*52,151,599
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

TriviaEdit

  • 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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