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 166
^ 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 50; 250–500; 3,000 Common Not sold
Uncut sapphire 1 Common 1,194
Uncut emerald 1 Common 2,138
Uncut ruby 1 Uncommon 3,146
Uncut diamond 1; 2; 45–55 (noted) Uncommon 5,764–317,020
Loop half of a key 1 Uncommon 24,334
Tooth half of a key 1 Uncommon 37,914
Uncut dragonstone 1; 45–55 (noted) Uncommon 14,086–774,730
Dragon longsword 1 Uncommon 58,058 Dragon spear 1 Uncommon 35,813
Battlestaff 180–220 (noted) Uncommon 1,384,920–1,692,680
Rune javelin 5 Rare 905
Rune platebody 1 Uncommon 38,063
Shield left half 1 Uncommon 64,265
Dragon helm 1 Uncommon 59,135
Rune arrowheads 113–137 Uncommon 21,131–25,619
Onyx bolts 135–165 Uncommon 1,127,250–1,377,750
Vecna skull 1 Uncommon 69,778
Water talisman 65–82 (noted) Uncommon 910,390–1,148,492
Earth talisman 65–82 (noted) Uncommon 298,870–377,036
Fire talisman 25–35 (noted) Uncommon 106,425–148,995
Chaos talisman 1 Uncommon 588
Nature talisman 1 Uncommon 294
Raw lobster 135–165 (noted) Uncommon 47,250–57,750
Raw shark 225–275 (noted) Uncommon 251,550–307,450
Big bones 80–90 (noted) Uncommon 37,600–42,300
Dragon bones 180–220 (noted) Uncommon 428,580–523,820
Coal 200–1,100 (noted) Uncommon 59,800–328,900
Gold ore 90–110 (noted) Uncommon 20,700–25,300
Adamantite ore 180–220 (noted) Uncommon 242,820–296,780
Adamant bar 15 (noted) Common 43,320
Adamant bar 135–165 (noted) Rare 389,880–476,520
Runite ore 90–110 (noted) Rare 954,720–1,166,880
Rune bar 3 (noted) Common 42,786
Rune bar 45–55 (noted) Rare 641,790–784,410
Grimy torstol 90–110 (noted) Uncommon 597,150–729,850
Grimy snapdragon 90–110 (noted) Uncommon 414,450–506,550
Super restore (4) 45–55 (noted) Uncommon 247,860–302,940
Prayer potion (4) 45–55 (noted) Uncommon 185,715–226,985
Lantadyme seed 14–16 Uncommon 248,738–284,272
Dwarf weed seed 14–16 Uncommon 318,570–364,080
Magic seed 4 Uncommon 569,608
Palm tree seed 10 Uncommon 1,387,040
Flax 450–550 (noted) Uncommon 31,950–39,050
Molten glass 45–55 (noted) Uncommon 12,330–15,070
Soft clay 450–550 (noted) Uncommon 105,750–129,250
Yew logs 68–82; 675–825 (noted) Uncommon 20,740–251,625
Teak plank 45–55 (noted) Uncommon 44,100–53,900
Mahogany plank 270–330 (noted) Uncommon 658,260–804,540
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.