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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
BonesBones1Always224

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 rune1–39Common25–975
Earth runeEarth rune1–40Common20–800
Air talismanAir talisman1Uncommon291
Mind talismanMind talisman1Uncommon214
Fire talismanFire talisman1Uncommon1,507
Cosmic talismanCosmic talisman1Rare469
Body talismanBody talisman1Rare247
Water talismanWater talisman1Uncommon6,817
Earth talismanEarth talisman1Uncommon1,666
Nature talismanNature talisman1Rare1,169
Chaos talismanChaos talisman1Uncommon1,403
Steel platebodySteel platebody1Common2,860
Black clawBlack claw1Common[1]4,065
Off-hand black clawOff-hand black claw1Common[1]1,574
Black platebodyBlack platebody1Common2,066
Mithril hatchetMithril hatchet1Common1,736
Rock-shell glovesRock-shell gloves1Uncommon4,954
Rock-shell bootsRock-shell boots1Uncommon5,424
Black warhammerBlack warhammer1Uncommon1,700
Off-hand black warhammerOff-hand black warhammer1Uncommon762
Adamant longswordAdamant longsword1Uncommon5,594
Adamant warhammerAdamant warhammer1Rare3,159
Poison ivy seed 5Poison ivy seed1Uncommon113
Belladonna seed 5Belladonna seed1Uncommon761
Guam seed 5Guam seed1Uncommon21
Marrentill seed 5Marrentill seed1Uncommon14
Tarromin seed 5Tarromin seed1Uncommon15
Harralander seed 5Harralander seed1Uncommon30
Toadflax seed 5Toadflax seed1Uncommon3,066
Ranarr seed 5Ranarr seed1Rare1,127
Irit seed 5Irit seed1Rare623
Avantoe seed 5Avantoe seed1Rare264
Snapdragon seed 5Snapdragon seed1Rare431
Cadantine seed 5Cadantine seed1Rare1,323
Lantadyme seed 5Lantadyme seed1Rare592
Kwuarm seed 5Kwuarm seed1Rare7,078
Dwarf weed seed 5Dwarf weed seed1Very rare543
Torstol seed 5Torstol seed1Very rare1,486
Grimy guamGrimy guam1Uncommon253
Grimy marrentillGrimy marrentill1Uncommon403
Grimy tarrominGrimy tarromin1Uncommon27
Grimy harralanderGrimy harralander1Uncommon84
Grimy ranarrGrimy ranarr1Rare3,136
Grimy iritGrimy irit1Rare3,796
Grimy avantoeGrimy avantoe1Rare1,836
Grimy kwuarmGrimy kwuarm1Rare5,551
Grimy cadantineGrimy cadantine1Rare3,641
Grimy lantadymeGrimy lantadyme1Rare3,550
Grimy dwarf weedGrimy dwarf weed1Rare2,783
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common209
Raw bassRaw bass1Common367
TinderboxTinderbox1Common228
CasketCasket1Rare4,371
Rock-shell splinterRock-shell splinter1Uncommon2,504
Rock-shell chunkRock-shell chunk1Rare1,892
Rock-shell shardRock-shell shard1Rare6,418
  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 sapphire1Common1,004
Uncut emeraldUncut emerald1Common2,350
Uncut rubyUncut ruby1Common2,276
Uncut diamondUncut diamond1Common4,049
Uncut diamondUncut diamond45–55 (noted)Rare182,205–222,695
Loop half of a keyLoop half of a key1Common18,785
Tooth half of a keyTooth half of a key1Common22,752
Uncut dragonstoneUncut dragonstone1Uncommon12,959
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare583,155–712,745
Dragon longswordDragon longsword1Common57,458
Dragon spearDragon spear1Rare36,450
BattlestaffBattlestaff180–220 (noted)Rare1,065,960–1,302,840
Rune javelinRune javelin5Rare885
Rune platebodyRune platebody1Uncommon37,609
Rune platebodyRune platebody15–25 (noted)Rare564,135–940,225
Shield left halfShield left half1Rare64,159
Dragon helmDragon helm1Uncommon59,027
Rune arrowheads 5Rune arrowheads113–137Common23,843–28,907
Onyx bolts 5Onyx bolts135–165Very rare1,070,415–1,308,285
Chaos talismanChaos talisman1Rare1,403
Nature talismanNature talisman1Rare1,169
Water talismanWater talisman65–82 (noted)Rare443,105–558,994
Earth talismanEarth talisman65–82 (noted)Rare108,290–136,612
Fire talismanFire talisman25–35 (noted)Rare37,675–52,745
Raw lobsterRaw lobster135–165 (noted)Common28,215–34,485
Raw sharkRaw shark225–275 (noted)Uncommon339,975–415,525
Big bonesBig bones72–90 (noted)Uncommon17,208–21,510
Dragon bonesDragon bones180–220 (noted)Rare339,480–414,920
CoalCoal200–1,100 (noted)Uncommon28,800–158,400
Gold oreGold ore90–110 (noted)Common15,570–19,030
Adamantite oreAdamantite ore180–220 (noted)Uncommon226,440–276,760
Adamant barAdamant bar14–16 (noted)Common43,358–49,552
Adamant barAdamant bar135–165 (noted)Rare418,095–511,005
Runite oreRunite ore90–110 (noted)Rare1,032,480–1,261,920
Rune barRune bar(noted)Common41,475
Rune barRune bar45–55 (noted)Rare622,125–760,375
Grimy torstolGrimy torstol90–110 (noted)Uncommon394,200–481,800
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon238,230–291,170
Super restore (4)Super restore (4)45–55 (noted)Uncommon244,395–298,705
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon180,315–220,385
Lantadyme seed 5Lantadyme seed14–16Uncommon8,288–9,472
Dwarf weed seed 5Dwarf weed seed14–16Uncommon7,602–8,688
Magic seed 5Magic seed4Uncommon429,492
Palm tree seed 5Palm tree seed10Rare1,723,790
FlaxFlax450–550 (noted)Common22,050–26,950
Molten glassMolten glass45–55 (noted)Common13,905–16,995
Soft claySoft clay450–550 (noted)Uncommon243,000–297,000
Yew logsYew logs68–82Uncommon13,600–16,400
Yew logsYew logs675–825 (noted)Rare135,000–165,000
Teak plankTeak plank45–55 (noted)Uncommon41,850–51,150
Mahogany plankMahogany plank270–330 (noted)Rare507,600–620,400
Blurberry specialBlurberry special1Uncommon2,088
Vecna skullVecna skull1Very rare*241,446
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

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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