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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
BonesBones1Always179

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 rune1–39Common20–780
Earth runeEarth rune1–40Common19–760
Air talismanAir talisman1Uncommon218
Mind talismanMind talisman1Uncommon239
Fire talismanFire talisman1Uncommon306
Cosmic talismanCosmic talisman1Rare513
Body talismanBody talisman1Rare352
Water talismanWater talisman1Uncommon3,655
Earth talismanEarth talisman1Uncommon226
Nature talismanNature talisman1Rare765
Chaos talismanChaos talisman1Uncommon1,183
Steel platebodySteel platebody1Common1,956
Black clawBlack claw1Common[1]2,953
Off-hand black clawOff-hand black claw1Common[1]1,501
Black platebodyBlack platebody1Common4,777
Mithril hatchetMithril hatchet1Common5,892
Rock-shell glovesRock-shell gloves1Uncommon7,037
Rock-shell bootsRock-shell boots1Uncommon5,621
Black warhammerBlack warhammer1Uncommon3,121
Off-hand black warhammerOff-hand black warhammer1Uncommon1,582
Adamant longswordAdamant longsword1Uncommon4,917
Adamant warhammerAdamant warhammer1Rare3,567
Poison ivy seed 5Poison ivy seed1Uncommon81
Belladonna seed 5Belladonna seed1Uncommon479
Guam seed 5Guam seed1Uncommon102
Marrentill seed 5Marrentill seed1Uncommon79
Tarromin seed 5Tarromin seed1Uncommon69
Harralander seed 5Harralander seed1Uncommon89
Toadflax seed 5Toadflax seed1Uncommon1,850
Ranarr seed 5Ranarr seed1Rare499
Irit seed 5Irit seed1Rare454
Avantoe seed 5Avantoe seed1Rare269
Snapdragon seed 5Snapdragon seed1Rare221
Cadantine seed 5Cadantine seed1Rare929
Lantadyme seed 5Lantadyme seed1Rare322
Kwuarm seed 5Kwuarm seed1Rare7,246
Dwarf weed seed 5Dwarf weed seed1Very rare291
Torstol seed 5Torstol seed1Very rare874
Grimy guamGrimy guam1Uncommon343
Grimy marrentillGrimy marrentill1Uncommon2,916
Grimy tarrominGrimy tarromin1Uncommon49
Grimy harralanderGrimy harralander1Uncommon93
Grimy ranarrGrimy ranarr1Rare1,187
Grimy iritGrimy irit1Rare2,944
Grimy avantoeGrimy avantoe1Rare690
Grimy kwuarmGrimy kwuarm1Rare5,685
Grimy cadantineGrimy cadantine1Rare1,842
Grimy lantadymeGrimy lantadyme1Rare4,273
Grimy dwarf weedGrimy dwarf weed1Rare3,665
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common189
Raw bassRaw bass1Common1,200
TinderboxTinderbox1Common240
CasketCasket1Rare1,082
Rock-shell splinterRock-shell splinter1Uncommon3,283
Rock-shell chunkRock-shell chunk1Rare2,045
Rock-shell shardRock-shell shard1Rare4,988
  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 sapphire1Common373
Uncut emeraldUncut emerald1Common711
Uncut rubyUncut ruby1Common1,069
Uncut diamondUncut diamond1Common2,375
Uncut diamondUncut diamond45–55 (noted)Rare106,875–130,625
Loop half of a keyLoop half of a key1Common10,714
Tooth half of a keyTooth half of a key1Common13,949
Uncut dragonstoneUncut dragonstone1Uncommon12,119
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare545,355–666,545
Dragon longswordDragon longsword1Common57,425
Dragon spearDragon spear1Rare36,648
BattlestaffBattlestaff180–220 (noted)Rare745,920–911,680
Rune javelinRune javelin5Rare860
Rune platebodyRune platebody1Uncommon37,480
Rune platebodyRune platebody15–25 (noted)Rare562,200–937,000
Shield left halfShield left half1Rare64,674
Dragon helmDragon helm1Uncommon58,923
Rune arrowheads 5Rune arrowheads113–137Common15,707–19,043
Onyx bolts 5Onyx bolts135–165Very rare1,067,310–1,304,490
Chaos talismanChaos talisman1Rare1,183
Nature talismanNature talisman1Rare765
Water talismanWater talisman65–82 (noted)Rare237,575–299,710
Earth talismanEarth talisman65–82 (noted)Rare14,690–18,532
Fire talismanFire talisman25–35 (noted)Rare7,650–10,710
Raw lobsterRaw lobster135–165 (noted)Common25,515–31,185
Raw sharkRaw shark225–275 (noted)Uncommon172,575–210,925
Big bonesBig bones68–82 (noted)Uncommon10,812–13,038
Dragon bonesDragon bones180–220 (noted)Rare336,420–411,180
CoalCoal200–1,100 (noted)Uncommon21,000–115,500
Gold oreGold ore90–110 (noted)Common29,070–35,530
Adamantite oreAdamantite ore180–220 (noted)Uncommon40,320–49,280
Adamant barAdamant bar14–16 (noted)Common25,340–28,960
Adamant barAdamant bar135–165 (noted)Rare244,350–298,650
Runite oreRunite ore90–110 (noted)Rare102,510–125,290
Rune barRune bar(noted)Common8,130
Rune barRune bar45–55 (noted)Rare121,950–149,050
Grimy torstolGrimy torstol90–110 (noted)Uncommon361,620–441,980
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon110,430–134,970
Super restore (4)Super restore (4)45–55 (noted)Uncommon162,135–198,165
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon120,015–146,685
Lantadyme seed 5Lantadyme seed14–16Uncommon4,508–5,152
Dwarf weed seed 5Dwarf weed seed14–16Uncommon4,074–4,656
Magic seed 5Magic seed4Uncommon116,100
Palm tree seed 5Palm tree seed10Rare228,080
FlaxFlax450–550 (noted)Common38,700–47,300
Molten glassMolten glass45–55 (noted)Common9,630–11,770
Soft claySoft clay450–550 (noted)Uncommon265,950–325,050
Yew logsYew logs68–82 (noted)Uncommon10,880–13,120
Yew logsYew logs675–825 (noted)Rare108,000–132,000
Teak plankTeak plank45–55 (noted)Uncommon13,185–16,115
Mahogany plankMahogany plank270–330 (noted)Rare208,710–255,090
Blurberry SpecialBlurberry Special1Uncommon8,380
Vecna skullVecna skull1Very rare*165,646
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,758,438,364
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 rare9,223

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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