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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
BonesBones1Always226

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 rune1–39Common17–663
Earth runeEarth rune1–40Common14–560
Air talismanAir talisman1Uncommon445
Mind talismanMind talisman1Uncommon306
Fire talismanFire talisman1Uncommon316
Cosmic talismanCosmic talisman1Rare617
Body talismanBody talisman1Rare480
Water talismanWater talisman1Uncommon3,020
Earth talismanEarth talisman1Uncommon192
Nature talismanNature talisman1Rare1,249
Chaos talismanChaos talisman1Uncommon1,456
Steel platebodySteel platebody1Common1,956
Black clawBlack claw1Common[1]3,196
Off-hand black clawOff-hand black claw1Common[1]1,642
Black platebodyBlack platebody1Common4,872
Mithril hatchetMithril hatchet1Common5,349
Rock-shell glovesRock-shell gloves1Uncommon6,840
Rock-shell bootsRock-shell boots1Uncommon6,281
Black warhammerBlack warhammer1Uncommon3,569
Off-hand black warhammerOff-hand black warhammer1Uncommon2,072
Adamant longswordAdamant longsword1Uncommon4,917
Adamant warhammerAdamant warhammer1Rare3,567
Poison ivy seed 5Poison ivy seed1Uncommon132
Belladonna seed 5Belladonna seed1Uncommon3,765
Guam seed 5Guam seed1Uncommon263
Marrentill seed 5Marrentill seed1Uncommon211
Tarromin seed 5Tarromin seed1Uncommon151
Harralander seed 5Harralander seed1Uncommon284
Toadflax seed 5Toadflax seed1Uncommon4,484
Ranarr seed 5Ranarr seed1Rare989
Irit seed 5Irit seed1Rare956
Avantoe seed 5Avantoe seed1Rare613
Snapdragon seed 5Snapdragon seed1Rare550
Cadantine seed 5Cadantine seed1Rare3,023
Lantadyme seed 5Lantadyme seed1Rare2,633
Kwuarm seed 5Kwuarm seed1Rare34,914
Dwarf weed seed 5Dwarf weed seed1Very rare1,473
Torstol seed 5Torstol seed1Very rare977
Grimy guamGrimy guam1Uncommon593
Grimy marrentillGrimy marrentill1Uncommon4,137
Grimy tarrominGrimy tarromin1Uncommon96
Grimy harralanderGrimy harralander1Uncommon273
Grimy ranarrGrimy ranarr1Rare2,106
Grimy iritGrimy irit1Rare4,855
Grimy avantoeGrimy avantoe1Rare1,114
Grimy kwuarmGrimy kwuarm1Rare12,341
Grimy cadantineGrimy cadantine1Rare3,124
Grimy lantadymeGrimy lantadyme1Rare9,586
Grimy dwarf weedGrimy dwarf weed1Rare9,491
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common583
Raw bassRaw bass1Common1,769
TinderboxTinderbox1Common207
CasketCasket1Rare830
Rock-shell splinterRock-shell splinter1Uncommon3,565
Rock-shell chunkRock-shell chunk1Rare1,964
Rock-shell shardRock-shell shard1Rare4,868
  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 sapphire1Common434
Uncut emeraldUncut emerald1Common743
Uncut rubyUncut ruby1Common1,320
Uncut diamondUncut diamond1Common2,694
Uncut diamondUncut diamond45–55 (noted)Rare121,230–148,170
Loop half of a keyLoop half of a key1Common11,513
Tooth half of a keyTooth half of a key1Common15,089
Uncut dragonstoneUncut dragonstone1Uncommon12,332
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare554,940–678,260
Dragon longswordDragon longsword1Common58,144
Dragon spearDragon spear1Rare36,765
BattlestaffBattlestaff180–220 (noted)Rare603,360–737,440
Rune javelinRune javelin5Rare915
Rune platebodyRune platebody1Uncommon37,480
Rune platebodyRune platebody15–25 (noted)Rare562,200–937,000
Shield left halfShield left half1Rare64,213
Dragon helmDragon helm1Uncommon59,018
Rune arrowheads 5Rune arrowheads113–137Common14,125–17,125
Onyx bolts 5Onyx bolts135–165Very rare1,047,600–1,280,400
Chaos talismanChaos talisman1Rare1,456
Nature talismanNature talisman1Rare1,249
Water talismanWater talisman65–82 (noted)Rare196,300–247,640
Earth talismanEarth talisman65–82 (noted)Rare12,480–15,744
Fire talismanFire talisman25–35 (noted)Rare7,900–11,060
Raw lobsterRaw lobster135–165 (noted)Common78,705–96,195
Raw sharkRaw shark225–275 (noted)Uncommon248,400–303,600
Big bonesBig bones68–82 (noted)Uncommon12,580–15,170
Dragon bonesDragon bones180–220 (noted)Rare408,600–499,400
CoalCoal200–1,100 (noted)Uncommon24,400–134,200
Gold oreGold ore90–110 (noted)Common33,660–41,140
Adamantite oreAdamantite ore180–220 (noted)Uncommon42,660–52,140
Adamant barAdamant bar14–16 (noted)Common21,434–24,496
Adamant barAdamant bar135–165 (noted)Rare206,685–252,615
Runite oreRunite ore90–110 (noted)Rare79,560–97,240
Rune barRune bar(noted)Common6,165
Rune barRune bar45–55 (noted)Rare92,475–113,025
Grimy torstolGrimy torstol90–110 (noted)Uncommon670,500–819,500
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon166,500–203,500
Super restore (4)Super restore (4)45–55 (noted)Uncommon149,715–182,985
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon170,370–208,230
Lantadyme seed 5Lantadyme seed14–16Uncommon36,862–42,128
Dwarf weed seed 5Dwarf weed seed14–16Uncommon20,622–23,568
Magic seed 5Magic seed4Uncommon363,508
Palm tree seed 5Palm tree seed10Rare839,040
FlaxFlax450–550 (noted)Common42,300–51,700
Molten glassMolten glass45–55 (noted)Common13,905–16,995
Soft claySoft clay450–550 (noted)Uncommon227,250–277,750
Yew logsYew logs68–82 (noted)Uncommon13,532–16,318
Yew logsYew logs675–825 (noted)Rare134,325–164,175
Teak plankTeak plank45–55 (noted)Uncommon14,175–17,325
Mahogany plankMahogany plank270–330 (noted)Rare228,150–278,850
Blurberry SpecialBlurberry Special1Uncommon14,775
Vecna skullVecna skull1Very rare*96,580
Hazelmere's signet ringHazelmere's signet ring1Very rare*1,621,945,897
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 rare6,874

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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