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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 rune1–39Common18–702
Earth runeEarth rune1–40Common16–640
Air talismanAir talisman1Uncommon486
Mind talismanMind talisman1Uncommon427
Fire talismanFire talisman1Uncommon393
Cosmic talismanCosmic talisman1Rare721
Body talismanBody talisman1Rare551
Water talismanWater talisman1Uncommon3,410
Earth talismanEarth talisman1Uncommon191
Nature talismanNature talisman1Rare1,365
Chaos talismanChaos talisman1Uncommon1,394
Steel platebodySteel platebody1Common1,956
Black clawBlack claw1Common[1]3,215
Off-hand black clawOff-hand black claw1Common[1]1,642
Black platebodyBlack platebody1Common4,980
Mithril hatchetMithril hatchet1Common5,562
Rock-shell glovesRock-shell gloves1Uncommon6,359
Rock-shell bootsRock-shell boots1Uncommon6,012
Black warhammerBlack warhammer1Uncommon3,502
Off-hand black warhammerOff-hand black warhammer1Uncommon2,076
Adamant longswordAdamant longsword1Uncommon4,917
Adamant warhammerAdamant warhammer1Rare3,567
Poison ivy seed 5Poison ivy seed1Uncommon172
Belladonna seed 5Belladonna seed1Uncommon3,340
Guam seed 5Guam seed1Uncommon321
Marrentill seed 5Marrentill seed1Uncommon193
Tarromin seed 5Tarromin seed1Uncommon182
Harralander seed 5Harralander seed1Uncommon156
Toadflax seed 5Toadflax seed1Uncommon7,282
Ranarr seed 5Ranarr seed1Rare1,611
Irit seed 5Irit seed1Rare1,447
Avantoe seed 5Avantoe seed1Rare616
Snapdragon seed 5Snapdragon seed1Rare589
Cadantine seed 5Cadantine seed1Rare2,823
Lantadyme seed 5Lantadyme seed1Rare3,094
Kwuarm seed 5Kwuarm seed1Rare16,613
Dwarf weed seed 5Dwarf weed seed1Very rare1,613
Torstol seed 5Torstol seed1Very rare985
Grimy guamGrimy guam1Uncommon617
Grimy marrentillGrimy marrentill1Uncommon3,336
Grimy tarrominGrimy tarromin1Uncommon90
Grimy harralanderGrimy harralander1Uncommon493
Grimy ranarrGrimy ranarr1Rare1,989
Grimy iritGrimy irit1Rare5,829
Grimy avantoeGrimy avantoe1Rare1,035
Grimy kwuarmGrimy kwuarm1Rare12,820
Grimy cadantineGrimy cadantine1Rare4,166
Grimy lantadymeGrimy lantadyme1Rare10,675
Grimy dwarf weedGrimy dwarf weed1Rare10,774
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common484
Raw bassRaw bass1Common1,515
TinderboxTinderbox1Common226
CasketCasket1Rare752
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 sapphire1Common559
Uncut emeraldUncut emerald1Common1,001
Uncut rubyUncut ruby1Common1,483
Uncut diamondUncut diamond1Common3,114
Uncut diamondUncut diamond45–55 (noted)Rare140,130–171,270
Loop half of a keyLoop half of a key1Common11,556
Tooth half of a keyTooth half of a key1Common14,185
Uncut dragonstoneUncut dragonstone1Uncommon14,037
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare631,665–772,035
Dragon longswordDragon longsword1Common57,989
Dragon spearDragon spear1Rare36,071
BattlestaffBattlestaff180–220 (noted)Rare545,040–666,160
Rune javelinRune javelin5Rare890
Rune platebodyRune platebody1Uncommon37,480
Rune platebodyRune platebody15–25 (noted)Rare562,200–937,000
Shield left halfShield left half1Rare63,701
Dragon helmDragon helm1Uncommon59,049
Rune arrowheads 5Rune arrowheads113–137Common13,899–16,851
Onyx bolts 5Onyx bolts135–165Very rare1,015,605–1,241,295
Chaos talismanChaos talisman1Rare1,394
Nature talismanNature talisman1Rare1,365
Water talismanWater talisman65–82 (noted)Rare221,650–279,620
Earth talismanEarth talisman65–82 (noted)Rare12,415–15,662
Fire talismanFire talisman25–35 (noted)Rare9,825–13,755
Raw lobsterRaw lobster135–165 (noted)Common65,340–79,860
Raw sharkRaw shark225–275 (noted)Uncommon280,350–342,650
Big bonesBig bones68–82 (noted)Uncommon13,260–15,990
Dragon bonesDragon bones180–220 (noted)Rare381,060–465,740
CoalCoal200–1,100 (noted)Uncommon22,200–122,100
Gold oreGold ore90–110 (noted)Common30,330–37,070
Adamantite oreAdamantite ore180–220 (noted)Uncommon43,020–52,580
Adamant barAdamant bar14–16 (noted)Common21,098–24,112
Adamant barAdamant bar135–165 (noted)Rare203,445–248,655
Runite oreRunite ore90–110 (noted)Rare78,030–95,370
Rune barRune bar(noted)Common6,567
Rune barRune bar45–55 (noted)Rare98,505–120,395
Grimy torstolGrimy torstol90–110 (noted)Uncommon730,260–892,540
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon148,950–182,050
Super restore (4)Super restore (4)45–55 (noted)Uncommon142,290–173,910
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon216,360–264,440
Lantadyme seed 5Lantadyme seed14–16Uncommon43,316–49,504
Dwarf weed seed 5Dwarf weed seed14–16Uncommon22,582–25,808
Magic seed 5Magic seed4Uncommon333,284
Palm tree seed 5Palm tree seed10Rare903,290
FlaxFlax450–550 (noted)Common48,600–59,400
Molten glassMolten glass45–55 (noted)Common18,900–23,100
Soft claySoft clay450–550 (noted)Uncommon212,850–260,150
Yew logsYew logs68–82 (noted)Uncommon12,444–15,006
Yew logsYew logs675–825 (noted)Rare123,525–150,975
Teak plankTeak plank45–55 (noted)Uncommon16,515–20,185
Mahogany plankMahogany plank270–330 (noted)Rare308,340–376,860
Blurberry SpecialBlurberry Special1Uncommon14,380
Vecna skullVecna skull1Very rare*108,881
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 rare5,162

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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