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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 194

Runes/TalismansEdit

  Item Quantity Rarity GE market price
Water rune Water rune 1–39 2 Common 23–897
Earth rune Earth rune 2–37 2 Common 32–592
Air talisman Air talisman 1 3 Uncommon 144
Mind talisman Mind talisman 1 3 Uncommon 196
Fire talisman Fire talisman 1 3 Uncommon 5,383
Cosmic talisman Cosmic talisman 1 4 Rare 1,088
Body talisman Body talisman 1 4 Rare 228
Water talisman Water talisman 1 3 Uncommon 16,165
Earth talisman Earth talisman 1 3 Uncommon 5,583
Nature talisman Nature talisman 1 4 Rare 517
Chaos talisman Chaos talisman 1 3 Uncommon 840

Weaponry/ArmourEdit

  Item Quantity Rarity GE market price
Steel platebody Steel platebody 1 2 Common 2,158
Black claw Black claw 1 3 Uncommon [1] 319
Off-hand black claw Off-hand black claw 1 3 Uncommon [1] 1,243
Black platebody Black platebody 1 2 Common 1,897
Mithril hatchet Mithril hatchet 1 2 Common 107
Rock-shell gloves Rock-shell gloves 1 3 Uncommon 31,443
Rock-shell boots Rock-shell boots 1 3 Uncommon 10,258
Black warhammer Black warhammer 1 3 Uncommon 468
Off-hand black warhammer Off-hand black warhammer 1 3 Uncommon 332
Adamant longsword Adamant longsword 1 3 Uncommon 1,480
Adamant warhammer Adamant warhammer 1 4 Rare 2,577
  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 62
Herb seed 5 Guam seed 1 3 Uncommon 6
Herb seed 5 Marrentill seed 1 3 Uncommon 29
Herb seed 5 Tarromin seed 1 3 Uncommon 17
Herb seed 5 Harralander seed 1 3 Uncommon 11
Herb seed 5 Toadflax seed 1 4 Rare 1,083
Herb seed 5 Ranarr seed 1 4 Rare 1,214
Herb seed 5 Irit seed 1 4 Rare 203
Herb seed 5 Avantoe seed 1 4 Rare 2,791
Herb seed 5 Snapdragon seed 1 4 Rare 2,443
Herb seed 5 Cadantine seed 1 4 Rare 824
Herb seed 5 Lantadyme seed 1 4 Rare 34,698
Herb seed 5 Dwarf weed seed 1 5 Very rare 42,806
Herb seed 5 Torstol seed 1 5 Very rare 29,470

HerbsEdit

  Item Quantity Rarity GE market price
Grimy guam Grimy guam 1 3 Uncommon 496
Grimy marrentill Grimy marrentill 1 3 Uncommon 98
Grimy tarromin Grimy tarromin 1 3 Uncommon 41
Grimy harralander Grimy harralander 1 3 Uncommon 139
Grimy ranarr Grimy ranarr 1 4 Rare 3,282
Grimy irit Grimy irit 1 4 Rare 2,885
Grimy avantoe Grimy avantoe 1 4 Rare 4,554
Grimy kwuarm Grimy kwuarm 1 4 Rare 3,977
Grimy cadantine Grimy cadantine 1 4 Rare 2,407
Grimy lantadyme Grimy lantadyme 1 4 Rare 8,800
Grimy dwarf weed Grimy dwarf weed 1 4 Rare 8,857

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 347
Raw bass Raw bass 1 2 Common 494
Tinderbox Tinderbox 1 2 Common 161
Casket Casket 1 4 Rare 4,655
Rock-shell splinter Rock-shell splinter 1 3 Uncommon 12,426
Rock-shell chunk Rock-shell chunk 1 4 Rare 6,072
Rock-shell shard Rock-shell shard 1 4 Rare 13,787
Clue scroll Clue scroll (medium) 1 5 Very rare Not sold
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 1,309
Uncut emerald Uncut emerald 1 2 Common 2,748
Uncut ruby Uncut ruby 1 2 Common 3,341
Uncut diamond Uncut diamond 1 3 Uncommon 5,805
Loop half of a key Loop half of a key 1 3 Uncommon 32,238
Tooth half of a key Tooth half of a key 1 3 Uncommon 39,390
Uncut dragonstone Uncut dragonstone 1 4 Rare 16,201
Dragonstone Dragonstone 1 4 Rare 10,311
Dragon dagger Dragon dagger 1 3 Uncommon 16,499
Rune battleaxe Rune battleaxe 1 4 Rare 24,238
Rune javelin Rune javelin 5 4 Rare 890
Adamant javelin Adamant javelin 20 5 Very rare 1,260
Rune 2h sword Rune 2h sword 1 5 Very rare 37,198
Rune spear Rune spear 1 5 Very rare 11,315
Dragon spear Dragon spear 1 5 Very rare 36,605
Battlestaff Battlestaff 200 (noted) 4 Rare 1,513,000
Rune sq shield Rune sq shield 1 5 Very rare 22,272
Rune kiteshield Rune kiteshield 1 5 Very rare 31,603
Shield left half Shield left half 1 5 Very rare 64,792
Dragon helm Dragon helm 1 5 Very rare 59,080
Adamant bolts 5 Adamant bolts 200 3 Uncommon 12,400
Onyx bolts 5 Onyx bolts 150 4 Rare 1,268,550
Rune arrow 5 Rune arrow 150 4 Rare 22,650
Vecna skull Vecna skull 1 5 Very rare 112,856
Water talisman Water talisman 1 3 Uncommon 16,165
Earth talisman Earth talisman 25–35 (noted) 3 Uncommon 139,575–195,405
Fire talisman Fire talisman 25–35 (noted) 3 Uncommon 134,575–188,405
Chaos talisman Chaos talisman 1 3 Uncommon 840
Nature talisman Nature talisman 1 3 Uncommon 517
Pure essence Pure essence 1,000–1,500 (noted) 3 Uncommon 16,000–24,000
Nature rune Nature rune 60–80 4 Rare 17,520–23,360
Soul rune Soul rune 20 4 Rare 4,120
Law rune Law rune 45 4 Rare 17,325
Death rune Death rune 50 4 Rare 11,300
Blood rune Blood rune 50 4 Rare 21,950
Raw swordfish Raw swordfish 125–250 (noted) 3 Uncommon 53,875–107,750
Raw shark Raw shark 250 (noted) 3 Uncommon 340,500
Big bones Big bones 150–180 (noted) 3 Uncommon 87,750–105,300
Coal Coal 550–700 (noted) 3 Uncommon 136,950–174,300
Adamantite ore Adamantite ore 150–250 (noted) 3 Uncommon 285,450–475,750
Silver ore Silver ore 100 (noted) 4 Rare 8,900
Runite ore Runite ore 100 (noted) 4 Rare 1,054,300
Rune bar Rune bar 1 2 Common 13,910
Rune bar Rune bar 50 (noted) 5 Very rare 695,500
Clean toadflax Clean toadflax 35–45 (noted) 3 Uncommon 143,570–184,590
Clean snapdragon Clean snapdragon 30–35 (noted) 3 Uncommon 150,510–175,595
Clean torstol Clean torstol 16–34 (noted) 3 Uncommon 130,672–277,678
Herb seed 5 Snapdragon seed 1 2 Common 2,443
Herb seed 5 Torstol seed 1 3 Uncommon 29,470
Watermelon seed 5 Watermelon seed 3 3 Uncommon 5,655
Magic seed 5 Magic seed 3–7 4 Rare 412,698–962,962
Palm tree seed 5 Palm tree seed 10 4 Rare 1,123,210
Yew logs Yew logs 450–550 (noted) 4 Rare 165,600–202,400
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
Ghostweave Ghostweave 10–30 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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