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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
BonesBones1Always362

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 rune1–40Common23–920
Air talismanAir talisman1Uncommon352
Mind talismanMind talisman1Uncommon229
Fire talismanFire talisman1Uncommon1,024
Cosmic talismanCosmic talisman1Rare619
Body talismanBody talisman1Rare312
Water talismanWater talisman1Uncommon5,439
Earth talismanEarth talisman1Uncommon1,415
Nature talismanNature talisman1Rare1,683
Chaos talismanChaos talisman1Uncommon2,094
Steel platebodySteel platebody1Common1,989
Black clawBlack claw1Common[1]3,514
Off-hand black clawOff-hand black claw1Common[1]1,406
Black platebodyBlack platebody1Common2,088
Mithril hatchetMithril hatchet1Common1,487
Rock-shell glovesRock-shell gloves1Uncommon5,512
Rock-shell bootsRock-shell boots1Uncommon4,640
Black warhammerBlack warhammer1Uncommon1,543
Off-hand black warhammerOff-hand black warhammer1Uncommon610
Adamant longswordAdamant longsword1Uncommon5,743
Adamant warhammerAdamant warhammer1Rare2,830
Poison ivy seed 5Poison ivy seed1Uncommon99
Belladonna seed 5Belladonna seed1Uncommon782
Guam seed 5Guam seed1Uncommon23
Marrentill seed 5Marrentill seed1Uncommon12
Tarromin seed 5Tarromin seed1Uncommon19
Harralander seed 5Harralander seed1Uncommon32
Toadflax seed 5Toadflax seed1Uncommon3,357
Ranarr seed 5Ranarr seed1Rare1,400
Irit seed 5Irit seed1Rare610
Avantoe seed 5Avantoe seed1Rare306
Snapdragon seed 5Snapdragon seed1Rare499
Cadantine seed 5Cadantine seed1Rare3,576
Lantadyme seed 5Lantadyme seed1Rare1,067
Kwuarm seed 5Kwuarm seed1Rare6,385
Dwarf weed seed 5Dwarf weed seed1Very rare851
Torstol seed 5Torstol seed1Very rare2,158
Grimy guamGrimy guam1Uncommon235
Grimy marrentillGrimy marrentill1Uncommon239
Grimy tarrominGrimy tarromin1Uncommon31
Grimy harralanderGrimy harralander1Uncommon90
Grimy ranarrGrimy ranarr1Rare3,109
Grimy iritGrimy irit1Rare2,987
Grimy avantoeGrimy avantoe1Rare1,963
Grimy kwuarmGrimy kwuarm1Rare5,425
Grimy cadantineGrimy cadantine1Rare3,989
Grimy lantadymeGrimy lantadyme1Rare3,477
Grimy dwarf weedGrimy dwarf weed1Rare2,619
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common151
Raw bassRaw bass1Common333
TinderboxTinderbox1Common223
CasketCasket1Rare2,887
Rock-shell splinterRock-shell splinter1Uncommon2,209
Rock-shell chunkRock-shell chunk1Rare1,750
Rock-shell shardRock-shell shard1Rare6,474
  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 sapphire1Common1,023
Uncut emeraldUncut emerald1Common1,892
Uncut rubyUncut ruby1Common1,954
Uncut diamondUncut diamond1Common3,756
Uncut diamondUncut diamond45–55 (noted)Rare169,020–206,580
Loop half of a keyLoop half of a key1Common18,807
Tooth half of a keyTooth half of a key1Common24,022
Uncut dragonstoneUncut dragonstone1Uncommon11,323
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare509,535–622,765
Dragon longswordDragon longsword1Common56,614
Dragon spearDragon spear1Rare39,828
BattlestaffBattlestaff180–220 (noted)Rare1,198,800–1,465,200
Rune javelinRune javelin5Rare885
Rune platebodyRune platebody1Uncommon37,703
Rune platebodyRune platebody15–25 (noted)Rare565,545–942,575
Shield left halfShield left half1Rare64,095
Dragon helmDragon helm1Uncommon58,431
Rune arrowheads 5Rune arrowheads113–137Common26,781–32,469
Onyx bolts 5Onyx bolts135–165Very rare1,061,100–1,296,900
Chaos talismanChaos talisman1Rare2,094
Nature talismanNature talisman1Rare1,683
Water talismanWater talisman65–82 (noted)Rare353,535–445,998
Earth talismanEarth talisman65–82 (noted)Rare91,975–116,030
Fire talismanFire talisman25–35 (noted)Rare25,600–35,840
Raw lobsterRaw lobster135–165 (noted)Common20,385–24,915
Raw sharkRaw shark225–275 (noted)Uncommon254,700–311,300
Big bonesBig bones72–90 (noted)Uncommon28,008–35,010
Dragon bonesDragon bones180–220 (noted)Rare258,660–316,140
CoalCoal200–1,100 (noted)Uncommon27,800–152,900
Gold oreGold ore90–110 (noted)Common14,940–18,260
Adamantite oreAdamantite ore180–220 (noted)Uncommon222,660–272,140
Adamant barAdamant bar14–16 (noted)Common39,508–45,152
Adamant barAdamant bar135–165 (noted)Rare380,970–465,630
Runite oreRunite ore90–110 (noted)Rare1,016,460–1,242,340
Rune barRune bar(noted)Common41,157
Rune barRune bar45–55 (noted)Rare617,355–754,545
Grimy torstolGrimy torstol90–110 (noted)Uncommon392,850–480,150
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon347,760–425,040
Super restore (4)Super restore (4)45–55 (noted)Uncommon266,760–326,040
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon227,160–277,640
Lantadyme seed 5Lantadyme seed14–16Uncommon14,938–17,072
Dwarf weed seed 5Dwarf weed seed14–16Uncommon11,914–13,616
Magic seed 5Magic seed4Uncommon482,544
Palm tree seed 5Palm tree seed10Rare2,170,200
FlaxFlax450–550 (noted)Common7,200–8,800
Molten glassMolten glass45–55 (noted)Common13,680–16,720
Soft claySoft clay450–550 (noted)Uncommon218,700–267,300
Yew logsYew logs68–82Uncommon14,348–17,302
Yew logsYew logs675–825 (noted)Rare142,425–174,075
Teak plankTeak plank45–55 (noted)Uncommon33,120–40,480
Mahogany plankMahogany plank270–330 (noted)Rare551,340–673,860
Blurberry specialBlurberry special1Uncommon1,899
Vecna skullVecna skull1Very rare*170,774
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,804,467,420
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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