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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
BonesBones1Always200

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 rune1–39Common19–741
Earth runeEarth rune1–40Common19–760
Air talismanAir talisman1Uncommon236
Mind talismanMind talisman1Uncommon218
Fire talismanFire talisman1Uncommon375
Cosmic talismanCosmic talisman1Rare486
Body talismanBody talisman1Rare414
Water talismanWater talisman1Uncommon3,994
Earth talismanEarth talisman1Uncommon240
Nature talismanNature talisman1Rare999
Chaos talismanChaos talisman1Uncommon1,338
Steel platebodySteel platebody1Common1,956
Black clawBlack claw1Common[1]3,035
Off-hand black clawOff-hand black claw1Common[1]1,549
Black platebodyBlack platebody1Common4,493
Mithril hatchetMithril hatchet1Common5,888
Rock-shell glovesRock-shell gloves1Uncommon7,139
Rock-shell bootsRock-shell boots1Uncommon5,691
Black warhammerBlack warhammer1Uncommon3,199
Off-hand black warhammerOff-hand black warhammer1Uncommon1,651
Adamant longswordAdamant longsword1Uncommon4,917
Adamant warhammerAdamant warhammer1Rare3,567
Poison ivy seed 5Poison ivy seed1Uncommon67
Belladonna seed 5Belladonna seed1Uncommon550
Guam seed 5Guam seed1Uncommon89
Marrentill seed 5Marrentill seed1Uncommon104
Tarromin seed 5Tarromin seed1Uncommon59
Harralander seed 5Harralander seed1Uncommon96
Toadflax seed 5Toadflax seed1Uncommon2,465
Ranarr seed 5Ranarr seed1Rare599
Irit seed 5Irit seed1Rare496
Avantoe seed 5Avantoe seed1Rare252
Snapdragon seed 5Snapdragon seed1Rare264
Cadantine seed 5Cadantine seed1Rare835
Lantadyme seed 5Lantadyme seed1Rare350
Kwuarm seed 5Kwuarm seed1Rare6,459
Dwarf weed seed 5Dwarf weed seed1Very rare308
Torstol seed 5Torstol seed1Very rare700
Grimy guamGrimy guam1Uncommon355
Grimy marrentillGrimy marrentill1Uncommon4,011
Grimy tarrominGrimy tarromin1Uncommon49
Grimy harralanderGrimy harralander1Uncommon143
Grimy ranarrGrimy ranarr1Rare1,304
Grimy iritGrimy irit1Rare2,987
Grimy avantoeGrimy avantoe1Rare711
Grimy kwuarmGrimy kwuarm1Rare5,945
Grimy cadantineGrimy cadantine1Rare1,730
Grimy lantadymeGrimy lantadyme1Rare4,555
Grimy dwarf weedGrimy dwarf weed1Rare3,836
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common210
Raw bassRaw bass1Common1,287
TinderboxTinderbox1Common218
CasketCasket1Rare958
Rock-shell splinterRock-shell splinter1Uncommon3,433
Rock-shell chunkRock-shell chunk1Rare1,998
Rock-shell shardRock-shell shard1Rare4,947
  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 sapphire1Common397
Uncut emeraldUncut emerald1Common726
Uncut rubyUncut ruby1Common1,223
Uncut diamondUncut diamond1Common2,545
Uncut diamondUncut diamond45–55 (noted)Rare114,525–139,975
Loop half of a keyLoop half of a key1Common10,388
Tooth half of a keyTooth half of a key1Common13,827
Uncut dragonstoneUncut dragonstone1Uncommon12,108
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare544,860–665,940
Dragon longswordDragon longsword1Common58,171
Dragon spearDragon spear1Rare36,444
BattlestaffBattlestaff180–220 (noted)Rare725,040–886,160
Rune javelinRune javelin5Rare910
Rune platebodyRune platebody1Uncommon37,480
Rune platebodyRune platebody15–25 (noted)Rare562,200–937,000
Shield left halfShield left half1Rare64,829
Dragon helmDragon helm1Uncommon58,958
Rune arrowheads 5Rune arrowheads113–137Common15,368–18,632
Onyx bolts 5Onyx bolts135–165Very rare1,053,810–1,287,990
Chaos talismanChaos talisman1Rare1,338
Nature talismanNature talisman1Rare999
Water talismanWater talisman65–82 (noted)Rare259,610–327,508
Earth talismanEarth talisman65–82 (noted)Rare15,600–19,680
Fire talismanFire talisman25–35 (noted)Rare9,375–13,125
Raw lobsterRaw lobster135–165 (noted)Common28,350–34,650
Raw sharkRaw shark225–275 (noted)Uncommon173,025–211,475
Big bonesBig bones68–82 (noted)Uncommon10,676–12,874
Dragon bonesDragon bones180–220 (noted)Rare321,660–393,140
CoalCoal200–1,100 (noted)Uncommon23,200–127,600
Gold oreGold ore90–110 (noted)Common33,840–41,360
Adamantite oreAdamantite ore180–220 (noted)Uncommon43,380–53,020
Adamant barAdamant bar14–16 (noted)Common22,918–26,192
Adamant barAdamant bar135–165 (noted)Rare220,995–270,105
Runite oreRunite ore90–110 (noted)Rare93,870–114,730
Rune barRune bar(noted)Common7,107
Rune barRune bar45–55 (noted)Rare106,605–130,295
Grimy torstolGrimy torstol90–110 (noted)Uncommon355,590–434,610
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon111,780–136,620
Super restore (4)Super restore (4)45–55 (noted)Uncommon178,155–217,745
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon127,215–155,485
Lantadyme seed 5Lantadyme seed14–16Uncommon4,900–5,600
Dwarf weed seed 5Dwarf weed seed14–16Uncommon4,312–4,928
Magic seed 5Magic seed4Uncommon104,348
Palm tree seed 5Palm tree seed10Rare277,870
FlaxFlax450–550 (noted)Common40,500–49,500
Molten glassMolten glass45–55 (noted)Common11,835–14,465
Soft claySoft clay450–550 (noted)Uncommon294,300–359,700
Yew logsYew logs68–82 (noted)Uncommon11,288–13,612
Yew logsYew logs675–825 (noted)Rare112,050–136,950
Teak plankTeak plank45–55 (noted)Uncommon14,670–17,930
Mahogany plankMahogany plank270–330 (noted)Rare223,020–272,580
Blurberry SpecialBlurberry Special1Uncommon9,095
Vecna skullVecna skull1Very rare*131,137
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,671,277,144
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 rare9,624

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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