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Giant rock crab

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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.

LocationsEdit

ChaosTunnels entrances

Use the middle south entrance just east of the wizard who teleports player to the Abyss. This is labelled entrance number 2 and goes directly to the giant rock crabs.

StrategyEdit

Giant Rock Crabs are extremely resistant 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.

They are most vulnerable to fire-based spells.

RetreatEdit

The Giant Rock Crab is one of few monsters that will retreat from battle when they become critically wounded.

DropsEdit

100%Edit

  Item Quantity Rarity GE market price
Bones Bones 1 1 Always 157

Runes/TalismansEdit

  Item Quantity Rarity GE market price
Water rune Water rune 1–39 2 Common 20–780
Earth rune Earth rune 2–37 2 Common 32–592
Air talisman Air talisman 1 3 Uncommon 176
Mind talisman Mind talisman 1 3 Uncommon 269
Fire talisman Fire talisman 1 3 Uncommon 2,565
Cosmic talisman Cosmic talisman 1 4 Rare 585
Body talisman Body talisman 1 4 Rare 265
Water talisman Water talisman 1 3 Uncommon 10,849
Earth talisman Earth talisman 1 3 Uncommon 2,638
Nature talisman Nature talisman 1 4 Rare 399
Chaos talisman Chaos talisman 1 3 Uncommon 560

Weaponry/ArmourEdit

  Item Quantity Rarity GE market price
Steel platebody Steel platebody 1 2 Common 1,222
Black claw Black claw 1 3 Uncommon [1] 283
Off-hand black claw Off-hand black claw 1 3 Uncommon [1] 1,048
Black platebody Black platebody 1 2 Common 1,919
Mithril hatchet Mithril hatchet 1 2 Common 106
Rock-shell gloves Rock-shell gloves 1 3 Uncommon 29,607
Rock-shell boots Rock-shell boots 1 3 Uncommon 9,547
Black warhammer Black warhammer 1 3 Uncommon 511
Off-hand black warhammer Off-hand black warhammer 1 3 Uncommon 326
Adamant longsword Adamant longsword 1 3 Uncommon 1,333
Adamant warhammer Adamant warhammer 1 4 Rare 2,573
  1. ^ a b Main hand and off hand claws are dropped together.

CharmsEdit

Charm drop percentages
No charms Gold charm Green charm Crimson charm Blue charm

30–33%

43–46%

9–11%

10–12%

3–4%

Represents 90% confidence range, based on a sample of 2,507 kills.
3 charms are dropped at a time.

Please add to the log (only if 50 or more creatures killed).


SeedsEdit

  Item Quantity Rarity GE market price
Poison ivy seed 5 Poison ivy seed 1 3 Uncommon 10
Belladonna seed 5 Belladonna seed 1 3 Uncommon 100
Herb seed 5 Guam seed 1 3 Uncommon 5
Herb seed 5 Marrentill seed 1 3 Uncommon 11
Herb seed 5 Tarromin seed 1 3 Uncommon 7
Herb seed 5 Harralander seed 1 3 Uncommon 12
Herb seed 5 Toadflax seed 1 4 Rare 655
Herb seed 5 Ranarr seed 1 4 Rare 1,168
Herb seed 5 Irit seed 1 4 Rare 155
Herb seed 5 Avantoe seed 1 4 Rare 1,301
Herb seed 5 Snapdragon seed 1 4 Rare 1,401
Herb seed 5 Cadantine seed 1 4 Rare 487
Herb seed 5 Lantadyme seed 1 4 Rare 24,057
Herb seed 5 Dwarf weed seed 1 5 Very rare 27,122
Herb seed 5 Torstol seed 1 5 Very rare 16,099

HerbsEdit

  Item Quantity Rarity GE market price
Grimy guam Grimy guam 1 3 Uncommon 413
Grimy marrentill Grimy marrentill 1 3 Uncommon 130
Grimy tarromin Grimy tarromin 1 3 Uncommon 35
Grimy harralander Grimy harralander 1 3 Uncommon 84
Grimy ranarr Grimy ranarr 1 4 Rare 2,582
Grimy irit Grimy irit 1 4 Rare 2,093
Grimy avantoe Grimy avantoe 1 4 Rare 3,925
Grimy kwuarm Grimy kwuarm 1 4 Rare 3,653
Grimy cadantine Grimy cadantine 1 4 Rare 2,016
Grimy lantadyme Grimy lantadyme 1 4 Rare 6,809
Grimy dwarf weed Grimy dwarf weed 1 4 Rare 6,930

OtherEdit

  Item Quantity Rarity GE market price
Coins 100 Coins 27, 28, 42, 70, 137 2 Common Not sold
Raw lobster Raw lobster 1 2 Common 351
Raw bass Raw bass 1 2 Common 463
Tinderbox Tinderbox 1 2 Common 176
Casket Casket 1 4 Rare 3,273
Rock-shell splinter Rock-shell splinter 1 3 Uncommon 12,528
Rock-shell chunk Rock-shell chunk 1 4 Rare 6,630
Rock-shell shard Rock-shell shard 1 4 Rare 9,902
Clue scroll (medium) Clue scroll (medium) 1 5 Very rare Not sold
Starved ancient effigy Starved ancient effigy 1 5 Very rare Not sold

Rare drop table dropsEdit

This monster has access to the rare drop table.
The ring of wealth is not required to access the table.
Show/hide rare drop table
Item Quantity Rarity GE Market Price
Coins 250 Coins 200–350,3,000 2 Common Not sold
Uncut sapphire Uncut sapphire 1 2 Common 1,092
Uncut emerald Uncut emerald 1 2 Common 2,076
Uncut ruby Uncut ruby 1 2 Common 2,928
Uncut diamond Uncut diamond 1 3 Uncommon 5,062
Loop half of a key Loop half of a key 1 3 Uncommon 27,134
Tooth half of a key Tooth half of a key 1 3 Uncommon 30,293
Uncut dragonstone Uncut dragonstone 1 4 Rare 13,198
Dragonstone Dragonstone 1 4 Rare 10,011
Dragon dagger Dragon dagger 1 3 Uncommon 16,480
Rune battleaxe Rune battleaxe 1 4 Rare 24,213
Rune javelin Rune javelin 5 4 Rare 890
Adamant javelin Adamant javelin 20 5 Very rare 1,240
Rune 2h sword Rune 2h sword 1 5 Very rare 37,288
Rune spear Rune spear 1 5 Very rare 11,434
Dragon spear Dragon spear 1 5 Very rare 36,909
Battlestaff Battlestaff 200 (noted) 4 Rare 1,572,400
Rune sq shield Rune sq shield 1 5 Very rare 21,958
Rune kiteshield Rune kiteshield 1 5 Very rare 31,619
Shield left half Shield left half 1 5 Very rare 64,586
Dragon helm Dragon helm 1 5 Very rare 59,231
Adamant bolts 5 Adamant bolts 200 3 Uncommon 11,800
Onyx bolts 5 Onyx bolts 150 4 Rare 1,257,600
Rune arrow 5 Rune arrow 150 4 Rare 22,650
Vecna skull Vecna skull 1 5 Very rare 94,419
Water talisman Water talisman 1 3 Uncommon 10,849
Earth talisman Earth talisman 25–35 (noted) 3 Uncommon 65,950–92,330
Fire talisman Fire talisman 25–35 (noted) 3 Uncommon 64,125–89,775
Chaos talisman Chaos talisman 1 3 Uncommon 560
Nature talisman Nature talisman 1 3 Uncommon 399
Pure essence Pure essence 1,000–1,500 (noted) 3 Uncommon 14,000–21,000
Nature rune Nature rune 60–80 4 Rare 21,660–28,880
Soul rune Soul rune 20 4 Rare 4,440
Law rune Law rune 45 4 Rare 19,485
Death rune Death rune 50 4 Rare 17,500
Blood rune Blood rune 50 4 Rare 25,000
Raw swordfish Raw swordfish 125–250 (noted) 3 Uncommon 55,375–110,750
Raw shark Raw shark 250 (noted) 3 Uncommon 285,750
Big bones Big bones 150–180 (noted) 3 Uncommon 85,050–102,060
Coal Coal 550–700 (noted) 3 Uncommon 149,050–189,700
Adamantite ore Adamantite ore 150–250 (noted) 3 Uncommon 203,100–338,500
Silver ore Silver ore 100 (noted) 4 Rare 8,700
Runite ore Runite ore 100 (noted) 4 Rare 1,068,600
Rune bar Rune bar 1 2 Common 14,177
Rune bar Rune bar 50 (noted) 5 Very rare 708,850
Clean toadflax Clean toadflax 35–45 (noted) 3 Uncommon 118,685–152,595
Clean snapdragon Clean snapdragon 30–35 (noted) 3 Uncommon 113,640–132,580
Clean torstol Clean torstol 16–34 (noted) 3 Uncommon 89,264–189,686
Herb seed 5 Snapdragon seed 1 2 Common 1,401
Herb seed 5 Torstol seed 1 3 Uncommon 16,099
Watermelon seed 5 Watermelon seed 3 3 Uncommon 7,458
Magic seed 5 Magic seed 3–7 4 Rare 496,065–1,157,485
Palm tree seed 5 Palm tree seed 10 4 Rare 1,565,080
Yew logs Yew logs 450–550 (noted) 4 Rare 161,100–196,900
Crystal triskelion fragment 1 Crystal triskelion fragment 1 1 5 Very rare Not sold
Crystal triskelion fragment 2 Crystal triskelion fragment 2 1 5 Very rare Not sold
Crystal triskelion fragment 3 Crystal triskelion fragment 3 1 5 Very rare Not sold
Brawling gloves (Melee) Brawling gloves (Melee) 1 5 Very rare Not sold
Brawling gloves (Magic) Brawling gloves (Magic) 1 5 Very rare Not sold
Brawling gloves (Ranged) Brawling gloves (Ranged) 1 5 Very rare Not sold
Brawling gloves (Agility) Brawling gloves (Agility) 1 5 Very rare Not sold
Brawling gloves (Cooking) Brawling gloves (Cooking) 1 5 Very rare Not sold
Brawling gloves (FM) Brawling gloves (FM) 1 5 Very rare Not sold
Brawling gloves (Fishing) Brawling gloves (Fishing) 1 5 Very rare Not sold
Brawling gloves (Hunter) Brawling gloves (Hunter) 1 5 Very rare Not sold
Brawling gloves (Mining) Brawling gloves (Mining) 1 5 Very rare Not sold
Brawling gloves (Prayer) Brawling gloves (Prayer) 1 5 Very rare Not sold
Brawling gloves (Smithing) Brawling gloves (Smithing) 1 5 Very rare Not sold
Brawling gloves (Thieving) Brawling gloves (Thieving) 1 5 Very rare Not sold
Brawling gloves (WC) Brawling gloves (WC) 1 5 Very rare Not sold

Universal dropsEdit

Universal drops are dropped by nearly every monster outside of Daemonheim.
These drops are dropped alongside main drops.
  Item Quantity Rarity GE market price
Key token Key token 1 4 Rare Not sold

TriviaEdit

  • 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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