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 215
^ 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 882
Uncut emerald 1 Common 1,492
Uncut ruby 1 Common 2,440
Uncut diamond 1 Common 3,930
Uncut diamond 45–55 (noted) Rare 176,850–216,150
Loop half of a key 1 Uncommon 17,130
Tooth half of a key 1 Uncommon 41,427
Uncut dragonstone 1 Uncommon 12,717
Uncut dragonstone 45–55 (noted) Rare 572,265–699,435
Dragon longsword 1 Common 57,773 Dragon spear 1 Uncommon 35,894
Battlestaff 180–220 (noted) Uncommon 1,299,060–1,587,740
Rune javelin 5 Rare 875
Rune platebody 1 Uncommon 38,032
Rune platebody 15–25 (noted) Rare 570,480–950,800
Shield left half 1 Uncommon 64,402
Dragon helm 1 Uncommon 59,003
Rune arrowheads 113–137 Common 20,453–24,797
Onyx bolts 135–165 Rare 1,150,200–1,405,800
Vecna skull 1 Uncommon 47,299
Chaos talisman 1 Uncommon 561
Nature talisman 1 Uncommon 199
Water talisman 65–82 (noted) Rare 738,075–931,110
Earth talisman 65–82 (noted) Rare 181,935–229,518
Fire talisman 25–35 (noted) Rare 65,625–91,875
Raw lobster 135–165 (noted) Uncommon 28,890–35,310
Raw shark 225–275 (noted) Uncommon 256,950–314,050
Big bones 80–90 (noted) Uncommon 32,800–36,900
Dragon bones 180–220 (noted) Uncommon 396,900–485,100
Coal 200–1,100 (noted) Uncommon 60,400–332,200
Gold ore 90–110 (noted) Common 16,470–20,130
Adamantite ore 180–220 (noted) Uncommon 222,480–271,920
Adamant bar 15 (noted) Common 40,905
Adamant bar 135–165 (noted) Rare 368,145–449,955
Runite ore 90–110 (noted) Rare 979,650–1,197,350
Rune bar 3 (noted) Common 42,888
Rune bar 45–55 (noted) Rare 643,320–786,280
Grimy torstol 90–110 (noted) Uncommon 464,760–568,040
Grimy snapdragon 90–110 (noted) Uncommon 325,440–397,760
Super restore (4) 45–55 (noted) Uncommon 176,985–216,315
Prayer potion (4) 45–55 (noted) Uncommon 117,540–143,660
Lantadyme seed 14–16 Uncommon 171,752–196,288
Dwarf weed seed 14–16 Uncommon 231,098–264,112
Magic seed 4 Uncommon 603,944
Palm tree seed 10 Rare 1,834,490
Flax 450–550 (noted) Common 20,700–25,300
Molten glass 45–55 (noted) Common 9,720–11,880
Soft clay 450–550 (noted) Uncommon 96,750–118,250
Yew logs 68–82 Uncommon 18,972–22,878
Yew logs 675–825 (noted) Rare 188,325–230,175
Teak plank 45–55 (noted) Uncommon 31,095–38,005
Mahogany plank 270–330 (noted) Rare 558,900–683,100
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.