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 195
^ 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 954
Uncut emerald 1 Common 1,832
Uncut ruby 1 Common 2,535
Uncut diamond 1 Common 4,088
Uncut diamond 45–55 (noted) Rare 183,960–224,840
Loop half of a key 1 Uncommon 18,864
Tooth half of a key 1 Uncommon 39,311
Uncut dragonstone 1 Uncommon 12,046
Uncut dragonstone 45–55 (noted) Rare 542,070–662,530
Dragon longsword 1 Common 57,948 Dragon spear 1 Uncommon 35,191
Battlestaff 180–220 (noted) Uncommon 1,279,080–1,563,320
Rune javelin 5 Rare 885
Rune platebody 1 Uncommon 38,052
Rune platebody 15–25 (noted) Rare 570,780–951,300
Shield left half 1 Uncommon 64,268
Dragon helm 1 Uncommon 59,075
Rune arrowheads 113–137 Common 19,436–23,564
Onyx bolts 135–165 Rare 1,127,115–1,377,585
Vecna skull 1 Uncommon 59,518
Chaos talisman 1 Uncommon 632
Nature talisman 1 Uncommon 231
Water talisman 65–82 (noted) Rare 725,205–914,874
Earth talisman 65–82 (noted) Rare 174,330–219,924
Fire talisman 25–35 (noted) Rare 71,125–99,575
Raw lobster 135–165 (noted) Uncommon 29,295–35,805
Raw shark 225–275 (noted) Uncommon 276,075–337,425
Big bones 80–90 (noted) Uncommon 32,160–36,180
Dragon bones 180–220 (noted) Uncommon 510,120–623,480
Coal 200–1,100 (noted) Uncommon 64,000–352,000
Gold ore 90–110 (noted) Common 17,460–21,340
Adamantite ore 180–220 (noted) Uncommon 223,020–272,580
Adamant bar 15 (noted) Common 42,690
Adamant bar 135–165 (noted) Rare 384,210–469,590
Runite ore 90–110 (noted) Rare 966,510–1,181,290
Rune bar 3 (noted) Common 42,921
Rune bar 45–55 (noted) Rare 643,815–786,885
Grimy torstol 90–110 (noted) Uncommon 463,950–567,050
Grimy snapdragon 90–110 (noted) Uncommon 402,660–492,140
Super restore (4) 45–55 (noted) Uncommon 200,160–244,640
Prayer potion (4) 45–55 (noted) Uncommon 138,825–169,675
Lantadyme seed 14–16 Uncommon 234,920–268,480
Dwarf weed seed 14–16 Uncommon 302,638–345,872
Magic seed 4 Uncommon 718,056
Palm tree seed 10 Rare 1,688,940
Flax 450–550 (noted) Common 18,000–22,000
Molten glass 45–55 (noted) Common 10,305–12,595
Soft clay 450–550 (noted) Uncommon 102,600–125,400
Yew logs 68–82 Uncommon 20,332–24,518
Yew logs 675–825 (noted) Rare 201,825–246,675
Teak plank 45–55 (noted) Uncommon 34,020–41,580
Mahogany plank 270–330 (noted) Rare 548,640–670,560
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.