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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
BonesBones1Always257

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 rune1–39Common27–1,053
Earth runeEarth rune1–40Common20–800
Air talismanAir talisman1Uncommon378
Mind talismanMind talisman1Uncommon223
Fire talismanFire talisman1Uncommon1,653
Cosmic talismanCosmic talisman1Rare315
Body talismanBody talisman1Rare212
Water talismanWater talisman1Uncommon6,633
Earth talismanEarth talisman1Uncommon1,905
Nature talismanNature talisman1Rare1,126
Chaos talismanChaos talisman1Uncommon1,666
Steel platebodySteel platebody1Common2,300
Black clawBlack claw1Common[1]3,245
Off-hand black clawOff-hand black claw1Common[1]1,397
Black platebodyBlack platebody1Common2,111
Mithril hatchetMithril hatchet1Common1,756
Rock-shell glovesRock-shell gloves1Uncommon6,060
Rock-shell bootsRock-shell boots1Uncommon5,851
Black warhammerBlack warhammer1Uncommon1,857
Off-hand black warhammerOff-hand black warhammer1Uncommon943
Adamant longswordAdamant longsword1Uncommon5,072
Adamant warhammerAdamant warhammer1Rare3,129
Poison ivy seed 5Poison ivy seed1Uncommon220
Belladonna seed 5Belladonna seed1Uncommon685
Guam seed 5Guam seed1Uncommon21
Marrentill seed 5Marrentill seed1Uncommon16
Tarromin seed 5Tarromin seed1Uncommon27
Harralander seed 5Harralander seed1Uncommon60
Toadflax seed 5Toadflax seed1Uncommon3,360
Ranarr seed 5Ranarr seed1Rare1,988
Irit seed 5Irit seed1Rare641
Avantoe seed 5Avantoe seed1Rare480
Snapdragon seed 5Snapdragon seed1Rare660
Cadantine seed 5Cadantine seed1Rare1,367
Lantadyme seed 5Lantadyme seed1Rare718
Kwuarm seed 5Kwuarm seed1Rare6,976
Dwarf weed seed 5Dwarf weed seed1Very rare708
Torstol seed 5Torstol seed1Very rare1,253
Grimy guamGrimy guam1Uncommon335
Grimy marrentillGrimy marrentill1Uncommon391
Grimy tarrominGrimy tarromin1Uncommon29
Grimy harralanderGrimy harralander1Uncommon94
Grimy ranarrGrimy ranarr1Rare2,443
Grimy iritGrimy irit1Rare3,204
Grimy avantoeGrimy avantoe1Rare1,310
Grimy kwuarmGrimy kwuarm1Rare5,079
Grimy cadantineGrimy cadantine1Rare2,684
Grimy lantadymeGrimy lantadyme1Rare2,822
Grimy dwarf weedGrimy dwarf weed1Rare1,897
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common226
Raw bassRaw bass1Common400
TinderboxTinderbox1Common277
CasketCasket1Rare2,149
Rock-shell splinterRock-shell splinter1Uncommon2,629
Rock-shell chunkRock-shell chunk1Rare2,043
Rock-shell shardRock-shell shard1Rare6,063
  1. ^ a b Main hand and off hand claws are dropped together.

Tertiary dropsEdit

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 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 250Coins250–500Common250–500
Uncut sapphireUncut sapphire1Common867
Uncut emeraldUncut emerald1Common1,932
Uncut rubyUncut ruby1Common1,728
Uncut diamondUncut diamond1Common3,495
Uncut diamondUncut diamond45–55 (noted)Rare157,275–192,225
Loop half of a keyLoop half of a key1Common18,214
Tooth half of a keyTooth half of a key1Common21,806
Uncut dragonstoneUncut dragonstone1Uncommon11,484
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare516,780–631,620
Dragon longswordDragon longsword1Common57,501
Dragon spearDragon spear1Rare37,333
BattlestaffBattlestaff180–220 (noted)Rare1,111,860–1,358,940
Rune javelinRune javelin5Rare900
Rune platebodyRune platebody1Uncommon37,695
Rune platebodyRune platebody15–25 (noted)Rare565,425–942,375
Shield left halfShield left half1Rare64,182
Dragon helmDragon helm1Uncommon58,790
Rune arrowheads 5Rune arrowheads113–137Common30,171–36,579
Onyx bolts 5Onyx bolts135–165Very rare1,068,795–1,306,305
Chaos talismanChaos talisman1Rare1,666
Nature talismanNature talisman1Rare1,126
Water talismanWater talisman65–82 (noted)Rare431,145–543,906
Earth talismanEarth talisman65–82 (noted)Rare123,825–156,210
Fire talismanFire talisman25–35 (noted)Rare41,325–57,855
Raw lobsterRaw lobster135–165 (noted)Common30,510–37,290
Raw sharkRaw shark225–275 (noted)Uncommon258,300–315,700
Big bonesBig bones68–82 (noted)Uncommon13,124–15,826
Dragon bonesDragon bones180–220 (noted)Rare310,320–379,280
CoalCoal200–1,100 (noted)Uncommon26,600–146,300
Gold oreGold ore90–110 (noted)Common16,560–20,240
Adamantite oreAdamantite ore180–220 (noted)Uncommon223,920–273,680
Adamant barAdamant bar14–16 (noted)Common39,354–44,976
Adamant barAdamant bar135–165 (noted)Rare379,485–463,815
Runite oreRunite ore90–110 (noted)Rare1,047,510–1,280,290
Rune barRune bar(noted)Common41,361
Rune barRune bar45–55 (noted)Rare620,415–758,285
Grimy torstolGrimy torstol90–110 (noted)Uncommon310,590–379,610
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon172,530–210,870
Super restore (4)Super restore (4)45–55 (noted)Uncommon190,485–232,815
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon180,180–220,220
Lantadyme seed 5Lantadyme seed14–16Uncommon10,052–11,488
Dwarf weed seed 5Dwarf weed seed14–16Uncommon9,912–11,328
Magic seed 5Magic seed4Uncommon395,992
Palm tree seed 5Palm tree seed10Rare1,064,950
FlaxFlax450–550 (noted)Common16,650–20,350
Molten glassMolten glass45–55 (noted)Common11,925–14,575
Soft claySoft clay450–550 (noted)Uncommon205,200–250,800
Yew logsYew logs68–82 (noted)Uncommon12,852–15,498
Yew logsYew logs675–825 (noted)Rare127,575–155,925
Teak plankTeak plank45–55 (noted)Uncommon32,310–39,490
Mahogany plankMahogany plank270–330 (noted)Rare369,360–451,440
Blurberry specialBlurberry special1Uncommon3,652
Vecna skullVecna skull1Very rare*295,839
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,885,212,297
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
Mimic kill tokenMimic kill token1Very rare18,367

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.