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.
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 684
Uncut emerald 1 Common 1,425
Uncut ruby 1 Common 2,491
Uncut diamond 1 Common 3,955
Uncut diamond 45–55 (noted) Rare 177,975–217,525
Loop half of a key 1 Uncommon 17,983
Tooth half of a key 1 Uncommon 37,008
Uncut dragonstone 1 Uncommon 12,457
Uncut dragonstone 45–55 (noted) Rare 560,565–685,135
Dragon longsword 1 Common 56,957 Dragon spear 1 Uncommon 36,022
Battlestaff 180–220 (noted) Uncommon 1,305,180–1,595,220
Rune javelin 5 Rare 810
Rune platebody 1 Uncommon 37,956
Rune platebody 15–25 (noted) Rare 569,340–948,900
Shield left half 1 Uncommon 64,923
Dragon helm 1 Uncommon 58,794
Rune arrowheads 113–137 Common 23,391–28,359
Onyx bolts 135–165 Rare 1,133,730–1,385,670
Vecna skull 1 Uncommon 40,117
Chaos talisman 1 Uncommon 1,022
Nature talisman 1 Uncommon 222
Water talisman 65–82 (noted) Rare 774,540–977,112
Earth talisman 65–82 (noted) Rare 181,870–229,436
Fire talisman 25–35 (noted) Rare 70,125–98,175
Raw lobster 135–165 (noted) Uncommon 27,135–33,165
Raw shark 225–275 (noted) Uncommon 181,125–221,375
Big bones 79–90 (noted) Uncommon 30,573–34,830
Dragon bones 180–220 (noted) Uncommon 312,300–381,700
Coal 200–1,100 (noted) Uncommon 77,800–427,900
Gold ore 90–110 (noted) Common 15,750–19,250
Adamantite ore 180–220 (noted) Uncommon 230,040–281,160
Adamant bar 15 (noted) Common 35,805
Adamant bar 135–165 (noted) Rare 322,245–393,855
Runite ore 90–110 (noted) Rare 928,080–1,134,320
Rune bar 3 (noted) Common 42,834
Rune bar 45–55 (noted) Rare 642,510–785,290
Grimy torstol 90–110 (noted) Uncommon 407,430–497,970
Grimy snapdragon 90–110 (noted) Uncommon 348,750–426,250
Super restore (4) 45–55 (noted) Uncommon 198,045–242,055
Prayer potion (4) 45–55 (noted) Uncommon 117,990–144,210
Lantadyme seed 14–16 Uncommon 130,704–149,376
Dwarf weed seed 14–16 Uncommon 172,830–197,520
Magic seed 4 Uncommon 498,812
Palm tree seed 10 Rare 1,577,240
Flax 450–550 (noted) Common 12,600–15,400
Molten glass 45–55 (noted) Common 8,865–10,835
Soft clay 450–550 (noted) Uncommon 85,050–103,950
Yew logs 68–82 Uncommon 17,680–21,320
Yew logs 675–825 (noted) Rare 175,500–214,500
Teak plank 45–55 (noted) Uncommon 29,970–36,630
Mahogany plank 270–330 (noted) Rare 541,890–662,310
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.