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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
BonesBones1Always266

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 rune1–39Common25–975
Earth runeEarth rune1–40Common18–720
Air talismanAir talisman1Uncommon498
Mind talismanMind talisman1Uncommon203
Fire talismanFire talisman1Uncommon209
Cosmic talismanCosmic talisman1Rare1,030
Body talismanBody talisman1Rare407
Water talismanWater talisman1Uncommon2,528
Earth talismanEarth talisman1Uncommon185
Nature talismanNature talisman1Rare1,473
Chaos talismanChaos talisman1Uncommon1,923
Steel platebodySteel platebody1Common1,956
Black clawBlack claw1Common[1]3,514
Off-hand black clawOff-hand black claw1Common[1]1,840
Black platebodyBlack platebody1Common6,443
Mithril hatchetMithril hatchet1Common5,242
Rock-shell glovesRock-shell gloves1Uncommon5,762
Rock-shell bootsRock-shell boots1Uncommon5,329
Black warhammerBlack warhammer1Uncommon3,812
Off-hand black warhammerOff-hand black warhammer1Uncommon2,278
Adamant longswordAdamant longsword1Uncommon4,917
Adamant warhammerAdamant warhammer1Rare3,567
Poison ivy seed 5Poison ivy seed1Uncommon302
Belladonna seed 5Belladonna seed1Uncommon1,007
Guam seed 5Guam seed1Uncommon176
Marrentill seed 5Marrentill seed1Uncommon179
Tarromin seed 5Tarromin seed1Uncommon137
Harralander seed 5Harralander seed1Uncommon196
Toadflax seed 5Toadflax seed1Uncommon9,872
Ranarr seed 5Ranarr seed1Rare976
Irit seed 5Irit seed1Rare1,018
Avantoe seed 5Avantoe seed1Rare375
Snapdragon seed 5Snapdragon seed1Rare293
Cadantine seed 5Cadantine seed1Rare1,438
Lantadyme seed 5Lantadyme seed1Rare726
Kwuarm seed 5Kwuarm seed1Rare12,857
Dwarf weed seed 5Dwarf weed seed1Very rare822
Torstol seed 5Torstol seed1Very rare540
Grimy guamGrimy guam1Uncommon709
Grimy marrentillGrimy marrentill1Uncommon2,307
Grimy tarrominGrimy tarromin1Uncommon105
Grimy harralanderGrimy harralander1Uncommon741
Grimy ranarrGrimy ranarr1Rare1,860
Grimy iritGrimy irit1Rare5,008
Grimy avantoeGrimy avantoe1Rare1,043
Grimy kwuarmGrimy kwuarm1Rare11,782
Grimy cadantineGrimy cadantine1Rare4,322
Grimy lantadymeGrimy lantadyme1Rare7,551
Grimy dwarf weedGrimy dwarf weed1Rare8,476
Coins 100Coins23–137Common23–137
Raw lobsterRaw lobster1Common353
Raw bassRaw bass1Common1,014
TinderboxTinderbox1Common474
CasketCasket1Rare572
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 sapphire1Common809
Uncut emeraldUncut emerald1Common2,555
Uncut rubyUncut ruby1Common1,842
Uncut diamondUncut diamond1Common4,843
Uncut diamondUncut diamond45–55 (noted)Rare217,935–266,365
Loop half of a keyLoop half of a key1Common11,053
Tooth half of a keyTooth half of a key1Common11,538
Uncut dragonstoneUncut dragonstone1Uncommon12,077
Uncut dragonstoneUncut dragonstone45–55 (noted)Rare543,465–664,235
Dragon longswordDragon longsword1Common56,212
Dragon spearDragon spear1Rare35,861
BattlestaffBattlestaff180–220 (noted)Rare542,160–662,640
Rune javelinRune javelin5Rare905
Rune platebodyRune platebody1Uncommon37,480
Rune platebodyRune platebody15–25 (noted)Rare562,200–937,000
Shield left halfShield left half1Rare64,399
Dragon helmDragon helm1Uncommon58,601
Rune arrowheads 5Rune arrowheads113–137Common14,916–18,084
Onyx bolts 5Onyx bolts135–165Very rare1,003,725–1,226,775
Chaos talismanChaos talisman1Rare1,923
Nature talismanNature talisman1Rare1,473
Water talismanWater talisman65–82 (noted)Rare164,320–207,296
Earth talismanEarth talisman65–82 (noted)Rare12,025–15,170
Fire talismanFire talisman25–35 (noted)Rare5,225–7,315
Raw lobsterRaw lobster135–165 (noted)Common47,655–58,245
Raw sharkRaw shark225–275 (noted)Uncommon321,075–392,425
Big bonesBig bones68–82 (noted)Uncommon13,804–16,646
Dragon bonesDragon bones180–220 (noted)Rare384,480–469,920
CoalCoal200–1,100 (noted)Uncommon22,400–123,200
Gold oreGold ore90–110 (noted)Common52,830–64,570
Adamantite oreAdamantite ore180–220 (noted)Uncommon40,860–49,940
Adamant barAdamant bar14–16 (noted)Common24,654–28,176
Adamant barAdamant bar135–165 (noted)Rare237,735–290,565
Runite oreRunite ore90–110 (noted)Rare127,710–156,090
Rune barRune bar(noted)Common8,955
Rune barRune bar45–55 (noted)Rare134,325–164,175
Grimy torstolGrimy torstol90–110 (noted)Uncommon485,010–592,790
Grimy snapdragonGrimy snapdragon90–110 (noted)Uncommon161,010–196,790
Super restore (4)Super restore (4)45–55 (noted)Uncommon125,910–153,890
Prayer potion (4)Prayer potion (4)45–55 (noted)Uncommon130,950–160,050
Lantadyme seed 5Lantadyme seed14–16Uncommon10,164–11,616
Dwarf weed seed 5Dwarf weed seed14–16Uncommon11,508–13,152
Magic seed 5Magic seed4Uncommon209,856
Palm tree seed 5Palm tree seed10Rare396,000
FlaxFlax450–550 (noted)Common43,200–52,800
Molten glassMolten glass45–55 (noted)Common27,585–33,715
Soft claySoft clay450–550 (noted)Uncommon188,550–230,450
Yew logsYew logs68–82 (noted)Uncommon11,356–13,694
Yew logsYew logs675–825 (noted)Rare112,725–137,775
Teak plankTeak plank45–55 (noted)Uncommon16,740–20,460
Mahogany plankMahogany plank270–330 (noted)Rare356,670–435,930
Blurberry SpecialBlurberry Special1Uncommon12,008
Vecna skullVecna skull1Very rare*124,871
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 rare5,575

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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