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
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.
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.
The Giant Rock Crab is one of few monsters that will
retreat from battle when they become critically wounded.
GE market price
Bones 1 Always 206
^ a b Main hand and off hand claws are dropped together.
Charm drop numbers No charm 0.7–1.1% 79–80% 9–10% 6–7% 2% Represents a 90% confidence range. Based on a sample of 6,007 kills. 3 charms are dropped at a time. Please add to the log. (Only if 50 or more creatures are killed)
Rare drop table drops Edit
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
GE market price
Coins 250–500; 3,000 Common Not sold
Uncut sapphire 1 Common 729
Uncut emerald 1 Common 1,381
Uncut ruby 1 Common 2,270
Uncut diamond 1 Common 4,028
Uncut diamond 45–55 (noted) Rare 181,260–221,540
Loop half of a key 1 Uncommon 18,126
Tooth half of a key 1 Uncommon 36,201
Uncut dragonstone 1 Uncommon 12,202
Uncut dragonstone 45–55 (noted) Rare 549,090–671,110
Dragon longsword 1 Common 58,053 Dragon spear 1 Uncommon 36,306
Battlestaff 180–220 (noted) Uncommon 1,294,380–1,582,020
Rune javelin 5 Rare 910
Rune platebody 1 Uncommon 38,218
Rune platebody 15–25 (noted) Rare 573,270–955,450
Shield left half 1 Uncommon 64,539
Dragon helm 1 Uncommon 59,182
Rune arrowheads 113–137 Common 24,182–29,318
Onyx bolts 135–165 Rare 1,150,470–1,406,130
Vecna skull 1 Uncommon 40,008
Chaos talisman 1 Uncommon 897
Nature talisman 1 Uncommon 203
Water talisman 65–82 (noted) Rare 748,995–944,886
Earth talisman 65–82 (noted) Rare 179,595–226,566
Fire talisman 25–35 (noted) Rare 69,300–97,020
Raw lobster 135–165 (noted) Uncommon 24,975–30,525
Raw shark 225–275 (noted) Uncommon 183,375–224,125
Big bones 80–90 (noted) Uncommon 31,760–35,730
Dragon bones 180–220 (noted) Uncommon 371,340–453,860
Coal 200–1,100 (noted) Uncommon 69,000–379,500
Gold ore 90–110 (noted) Common 15,750–19,250
Adamantite ore 180–220 (noted) Uncommon 244,440–298,760
Adamant bar 15 (noted) Common 41,775
Adamant bar 135–165 (noted) Rare 375,975–459,525
Runite ore 90–110 (noted) Rare 955,800–1,168,200
Rune bar 3 (noted) Common 42,822
Rune bar 45–55 (noted) Rare 642,330–785,070
Grimy torstol 90–110 (noted) Uncommon 449,280–549,120
Grimy snapdragon 90–110 (noted) Uncommon 313,470–383,130
Super restore (4) 45–55 (noted) Uncommon 133,290–162,910
Prayer potion (4) 45–55 (noted) Uncommon 115,965–141,735
Lantadyme seed 14–16 Uncommon 136,346–155,824
Dwarf weed seed 14–16 Uncommon 189,224–216,256
Magic seed 4 Uncommon 566,548
Palm tree seed 10 Rare 1,510,300
Flax 450–550 (noted) Common 13,050–15,950
Molten glass 45–55 (noted) Common 6,300–7,700
Soft clay 450–550 (noted) Uncommon 95,400–116,600
Yew logs 68–82 Uncommon 18,904–22,796
Yew logs 675–825 (noted) Rare 187,650–229,350
Teak plank 45–55 (noted) Uncommon 32,940–40,260
Mahogany plank 270–330 (noted) Rare 600,480–733,920
Brawling gloves (Melee) 1 Rare Not sold
Brawling gloves (Magic) 1 Rare Not sold
Brawling gloves (Ranged) 1 Rare Not sold
Brawling gloves (Agility) 1 Rare Not sold
Brawling gloves (Cooking) 1 Rare Not sold
Brawling gloves (FM) 1 Rare Not sold
Brawling gloves (Fishing) 1 Rare Not sold
Brawling gloves (Hunter) 1 Rare Not sold
Brawling gloves (Mining) 1 Rare Not sold
Brawling gloves (Prayer) 1 Rare Not sold
Brawling gloves (Smithing) 1 Rare Not sold
Brawling gloves (Thieving) 1 Rare Not sold
Brawling gloves (WC) 1 Rare Not sold
Crystal triskelion fragment 1 1 Very rare Not sold
Crystal triskelion fragment 2 1 Very rare Not sold
Crystal triskelion fragment 3 1 Very rare Not sold
Universal drops Edit
Universal drops are dropped by nearly every monster outside of Daemonheim.
These drops are dropped alongside main drops.
GE market price
Key token 1 Rare Not sold
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.