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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
BonesBones1Always296

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 rune1–39Common26–1,014
Earth runeEarth rune1–40Common18–720
Air talismanAir talisman1Uncommon507
Mind talismanMind talisman1Uncommon205
Fire talismanFire talisman1Uncommon210
Cosmic talismanCosmic talisman1Rare1,005
Body talismanBody talisman1Rare383
Water talismanWater talisman1Uncommon2,579
Earth talismanEarth talisman1Uncommon202
Nature talismanNature talisman1Rare1,549
Chaos talismanChaos talisman1Uncommon1,752
Steel platebodySteel platebody1Common1,956
Black clawBlack claw1Common[1]3,514
Off-hand black clawOff-hand black claw1Common[1]1,840
Black platebodyBlack platebody1Common6,363
Mithril hatchetMithril hatchet1Common5,172
Rock-shell glovesRock-shell gloves1Uncommon5,638
Rock-shell bootsRock-shell boots1Uncommon5,329
Black warhammerBlack warhammer1Uncommon3,915
Off-hand black warhammerOff-hand black warhammer1Uncommon2,278
Adamant longswordAdamant longsword1Uncommon4,917
Adamant warhammerAdamant warhammer1Rare3,567
Poison ivy seed 5Poison ivy seed1Uncommon325
Belladonna seed 5Belladonna seed1Uncommon1,036
Guam seed 5Guam seed1Uncommon190
Marrentill seed 5Marrentill seed1Uncommon173
Tarromin seed 5Tarromin seed1Uncommon118
Harralander seed 5Harralander seed1Uncommon206
Toadflax seed 5Toadflax seed1Uncommon7,656
Ranarr seed 5Ranarr seed1Rare996
Irit seed 5Irit seed1Rare1,013
Avantoe seed 5Avantoe seed1Rare391
Snapdragon seed 5Snapdragon seed1Rare295
Cadantine seed 5Cadantine seed1Rare1,513
Lantadyme seed 5Lantadyme seed1Rare758
Kwuarm seed 5Kwuarm seed1Rare12,504
Dwarf weed seed 5Dwarf weed seed1Very rare891
Torstol seed 5Torstol seed1Very rare557
Grimy guamGrimy guam1Uncommon727
Grimy marrentillGrimy marrentill1Uncommon2,287
Grimy tarrominGrimy tarromin1Uncommon105
Grimy harralanderGrimy harralander1Uncommon683
Grimy ranarrGrimy ranarr1Rare1,918
Grimy iritGrimy irit1Rare5,039
Grimy avantoeGrimy avantoe1Rare1,028
Grimy kwuarmGrimy kwuarm1Rare11,164
Grimy cadantineGrimy cadantine1Rare4,504
Grimy lantadymeGrimy lantadyme1Rare7,640
Grimy dwarf weedGrimy dwarf weed1Rare8,106
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common342
Raw bassRaw bass1Common1,070
TinderboxTinderbox1Common473
CasketCasket1Rare558
Rock-shell splinterRock-shell splinter1Uncommon3,534
Rock-shell chunkRock-shell chunk1Rare1,871
Rock-shell shardRock-shell shard1Rare4,565
  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 sapphire1Common722
Uncut emeraldUncut emerald1Common2,673
Uncut rubyUncut ruby1Common1,732
Uncut diamondUncut diamond1Common4,618
Uncut diamondUncut diamond45–55 (noted)Rare207,810–253,990
Loop half of a keyLoop half of a key1Common11,168
Tooth half of a keyTooth half of a key1Common11,541
Uncut dragonstoneUncut dragonstone1Uncommon12,295
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare553,275–676,225
Dragon longswordDragon longsword1Common57,354
Dragon spearDragon spear1Rare36,012
BattlestaffBattlestaff180–220 (noted)Rare554,580–677,820
Rune javelinRune javelin5Rare910
Rune platebodyRune platebody1Uncommon37,480
Rune platebodyRune platebody15–25 (noted)Rare562,200–937,000
Shield left halfShield left half1Rare65,049
Dragon helmDragon helm1Uncommon58,585
Rune arrowheads 5Rune arrowheads113–137Common14,803–17,947
Onyx bolts 5Onyx bolts135–165Very rare1,002,510–1,225,290
Chaos talismanChaos talisman1Rare1,752
Nature talismanNature talisman1Rare1,549
Water talismanWater talisman65–82 (noted)Rare167,635–211,478
Earth talismanEarth talisman65–82 (noted)Rare13,130–16,564
Fire talismanFire talisman25–35 (noted)Rare5,250–7,350
Raw lobsterRaw lobster135–165 (noted)Common46,170–56,430
Raw sharkRaw shark225–275 (noted)Uncommon313,875–383,625
Big bonesBig bones68–82 (noted)Uncommon13,804–16,646
Dragon bonesDragon bones180–220 (noted)Rare409,320–500,280
CoalCoal200–1,100 (noted)Uncommon21,600–118,800
Gold oreGold ore90–110 (noted)Common52,920–64,680
Adamantite oreAdamantite ore180–220 (noted)Uncommon40,500–49,500
Adamant barAdamant bar14–16 (noted)Common25,816–29,504
Adamant barAdamant bar135–165 (noted)Rare248,940–304,260
Runite oreRunite ore90–110 (noted)Rare147,780–180,620
Rune barRune bar(noted)Common9,291
Rune barRune bar45–55 (noted)Rare139,365–170,335
Grimy torstolGrimy torstol90–110 (noted)Uncommon502,110–613,690
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon160,470–196,130
Super restore (4)Super restore (4)45–55 (noted)Uncommon122,310–149,490
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon130,230–159,170
Lantadyme seed 5Lantadyme seed14–16Uncommon10,612–12,128
Dwarf weed seed 5Dwarf weed seed14–16Uncommon12,474–14,256
Magic seed 5Magic seed4Uncommon225,724
Palm tree seed 5Palm tree seed10Rare398,950
FlaxFlax450–550 (noted)Common44,100–53,900
Molten glassMolten glass45–55 (noted)Common22,590–27,610
Soft claySoft clay450–550 (noted)Uncommon181,350–221,650
Yew logsYew logs68–82 (noted)Uncommon11,288–13,612
Yew logsYew logs675–825 (noted)Rare112,050–136,950
Teak plankTeak plank45–55 (noted)Uncommon15,075–18,425
Mahogany plankMahogany plank270–330 (noted)Rare319,680–390,720
Blurberry SpecialBlurberry Special1Uncommon11,631
Vecna skullVecna skull1Very rare*120,343
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,432,268,388
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 rare5,285

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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