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 187
^ 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 750
Uncut emerald 1 Common 1,424
Uncut ruby 1 Common 2,187
Uncut diamond 1 Common 3,724
Uncut diamond 45–55 (noted) Rare 167,580–204,820
Loop half of a key 1 Uncommon 17,890
Tooth half of a key 1 Uncommon 40,714
Uncut dragonstone 1 Uncommon 12,768
Uncut dragonstone 45–55 (noted) Rare 574,560–702,240
Dragon longsword 1 Common 58,147 Dragon spear 1 Uncommon 36,538
Battlestaff 180–220 (noted) Uncommon 1,288,080–1,574,320
Rune javelin 5 Rare 915
Rune platebody 1 Uncommon 38,010
Rune platebody 15–25 (noted) Rare 570,150–950,250
Shield left half 1 Uncommon 65,239
Dragon helm 1 Uncommon 58,973
Rune arrowheads 113–137 Common 25,877–31,373
Onyx bolts 135–165 Rare 1,146,150–1,400,850
Vecna skull 1 Uncommon 41,880
Chaos talisman 1 Uncommon 630
Nature talisman 1 Uncommon 210
Water talisman 65–82 (noted) Rare 798,330–1,007,124
Earth talisman 65–82 (noted) Rare 205,010–258,628
Fire talisman 25–35 (noted) Rare 73,000–102,200
Raw lobster 135–165 (noted) Uncommon 34,560–42,240
Raw shark 225–275 (noted) Uncommon 169,425–207,075
Big bones 80–90 (noted) Uncommon 32,720–36,810
Dragon bones 180–220 (noted) Uncommon 344,340–420,860
Coal 200–1,100 (noted) Uncommon 62,800–345,400
Gold ore 90–110 (noted) Common 16,110–19,690
Adamantite ore 180–220 (noted) Uncommon 252,180–308,220
Adamant bar 15 (noted) Common 47,250
Adamant bar 135–165 (noted) Rare 425,250–519,750
Runite ore 90–110 (noted) Rare 994,770–1,215,830
Rune bar 3 (noted) Common 43,380
Rune bar 45–55 (noted) Rare 650,700–795,300
Grimy torstol 90–110 (noted) Uncommon 481,860–588,940
Grimy snapdragon 90–110 (noted) Uncommon 329,760–403,040
Super restore (4) 45–55 (noted) Uncommon 156,420–191,180
Prayer potion (4) 45–55 (noted) Uncommon 131,490–160,710
Lantadyme seed 14–16 Uncommon 137,004–156,576
Dwarf weed seed 14–16 Uncommon 218,736–249,984
Magic seed 4 Uncommon 593,528
Palm tree seed 10 Rare 1,744,160
Flax 450–550 (noted) Common 15,300–18,700
Molten glass 45–55 (noted) Common 8,100–9,900
Soft clay 450–550 (noted) Uncommon 86,850–106,150
Yew logs 68–82 Uncommon 18,224–21,976
Yew logs 675–825 (noted) Rare 180,900–221,100
Teak plank 45–55 (noted) Uncommon 32,490–39,710
Mahogany plank 270–330 (noted) Rare 572,400–699,600
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.