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Giant rock crab

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2007 rune

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 Rock-shell armour.


ChaosTunnels entrances
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.


Due to an update, the information in this article may be out-of-date.
Reason: Evolution of combat

You can help improve this page by editing it.
Rock Crab Haven
A player killing Giant Rock Crabs from a distance.
Giant Rock Crabs are extremely resistant to Melee and Ranged attacks, and thus are only effectively killed using Magic. However, Verac's armour and Diamond bolts (e) are quite effective with their shared unique effect, which can hit through their high physical and ranged defence, Verac's armour also has a prayer bonus allowing the player to use Protect from melee for longer than usual. This method is advised for those with a low Magic level but high melee combat levels. For lower attack levels the use of Attack Potions can be used to improve the chances of hitting. Rock Crabs drop three charms at once, and are a very good source of gold charms. These Crabs are not immune to poison, but are extremely difficult to poison them with a poisoned weapon like the dragon dagger or any poisoned ranged ammo because of their high Melee and Ranged defence.

Another method includes wearing rune or better armour, and bringing a weapon with a high crush attack bonus, such as the Zamorakian spear or Barrelchest anchor. Slash weapons such as the Abyssal whip are not recommended due to the crabs' high slash defence.

A notably effective and economic way to kill Giant Rock Crabs is the Black Salamander, or the Polypore Staff. The Black Salamander's magic attack, and the Polypore staff's attack acts as a normal magic attack and takes advantage of their lower magic defence. Their magic defence is so low you can utilise high level defensive armour without losing much accuracy.

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.

Giant rock crabs have a very high defence, but relatively low attack and strength. If attacked in the Chaos Tunnels they will walk off and stop attacking you after a minute or two.

If using mage, note that they are most vulnerable to fire-based spells.

Mage Gear is as follows:

Note: Another useful tactic is to use (Elite) Void knight equipment, preferably with a Deflector and a good mage robe top.

If you are using ice burst or barrage the arcane stream necklace is not as important here because magic damage boost adds only to the target you click on. The other 8 targets do not receive the damage boost from it or your staff, so you would be better off using a necklace with a prayer bonus.

If using burst or barrage spells the Staff of light is recommended despite the lower mage bonus (in comparison to Master wand, or Chaotic staff) given the fact that it gives free casts; when used in conjunction with Battle Robes, it has a 50% chance of saving runes when casting. Even when this effect doesn't activate, the Battle Robes themselves have a chance to save runes, effectively adding up to a 60% chance of saving runes. The Battle robes will, however, only last for 6 hours of combat after which they will need to be recharged (270 tokens).

Provided you are going to be bursting, a Tome of frost is recommended above items that provide a higher magic bonus. This is because rock lobsters have fairly low magic defence (thus the difference in offensive magic bonus is negligible), while the tome saves an inventory space and the need for Water runes.


The Giant Rock Crab is one of few monsters in RuneScape that will retreat from battle when they become critically wounded. One way to avoid this (in the southern room in the chaos tunnels) is to kill the eastern one first (using the safespot in the picture above). Then when picking up the drop from them you will have likely alerted a few other giant rock crabs. Go back to the safespot and two should follow you there, from there kill them. While you're killing them the one you first killed should spawn but not attack (unless you go beside it). Because he spawns the other two can't get out and are trapped, so they cannot retreat. After killing the first one, don't pick up the drop and proceed to kill the second one. This means that you will not alert the one that spawned and you will have another retreat free kill. This may be repeated indefinitely in this fashion.



  Item Quantity Rarity GE Market Price
Bones Bones 1 1 Always 315


  Item Quantity Rarity GE Market Price
Water rune Water rune 1–39 2 Common 20–780
Earth rune Earth rune 2–37 2 Common 22–407
Air talisman Air talisman 1 3 Uncommon 122
Mind talisman Mind talisman 1 3 Uncommon 314
Fire talisman Fire talisman 1 3 Uncommon 1,674
Cosmic talisman Cosmic talisman 1 4 Rare 650
Body talisman Body talisman 1 4 Rare 318
Water talisman Water talisman 1 3 Uncommon 11,536
Earth talisman Earth talisman 1 3 Uncommon 1,402
Nature talisman Nature talisman 1 4 Rare 447
Chaos talisman Chaos talisman 1 3 Uncommon 665


  Item Quantity Rarity GE Market Price
Steel platebody Steel platebody 1 2 Common 936
Black claw Black claw 1 3 Uncommon [1] 501
Off-hand black claw Off-hand black claw 1 3 Uncommon [1] 2,591
Black platebody Black platebody 1 2 Common 1,904
Mithril hatchet Mithril hatchet 1 2 Common 102
Rock-shell gloves Rock-shell gloves 1 3 Uncommon 14,099
Rock-shell boots Rock-shell boots 1 3 Uncommon 1,495
Black warhammer Black warhammer 1 3 Uncommon 441
Off-hand black warhammer Off-hand black warhammer 1 3 Uncommon 470
Adamant longsword Adamant longsword 1 3 Uncommon 1,407
Adamant warhammer Adamant warhammer 1 4 Rare 2,639
  1. ^ a b Main hand and off hand claws are dropped together.


Charm drop percentages
No charms Gold charm Green charm Crimson charm Blue charm






Represents 90% confidence range, based on a sample of 2,507 kills.
3 charms are dropped at a time.

Please add to the log (only if 50 or more creatures killed).


  Item Quantity Rarity GE Market Price
Poison ivy seed 5 Poison ivy seed 1 3 Uncommon 1
Belladonna seed 5 Belladonna seed 1 3 Uncommon 639
Herb seed 5 Guam seed 1 3 Uncommon 4
Herb seed 5 Marrentill seed 1 3 Uncommon 6
Herb seed 5 Tarromin seed 1 3 Uncommon 6
Herb seed 5 Harralander seed 1 3 Uncommon 11
Herb seed 5 Toadflax seed 1 4 Rare 1,891
Herb seed 5 Ranarr seed 1 4 Rare 1,296
Herb seed 5 Irit seed 1 4 Rare 258
Herb seed 5 Avantoe seed 1 4 Rare 3,376
Herb seed 5 Snapdragon seed 1 4 Rare 1,406
Herb seed 5 Cadantine seed 1 4 Rare 1,805
Herb seed 5 Lantadyme seed 1 4 Rare 37,332
Herb seed 5 Dwarf weed seed 1 5 Very rare 49,718
Herb seed 5 Torstol seed 1 5 Very rare 16,095


  Item Quantity Rarity GE Market Price
Grimy guam Grimy guam 1 3 Uncommon 497
Grimy marrentill Grimy marrentill 1 3 Uncommon 72
Grimy tarromin Grimy tarromin 1 3 Uncommon 40
Grimy harralander Grimy harralander 1 3 Uncommon 204
Grimy ranarr Grimy ranarr 1 4 Rare 3,010
Grimy irit Grimy irit 1 4 Rare 2,821
Grimy avantoe Grimy avantoe 1 4 Rare 4,650
Grimy kwuarm Grimy kwuarm 1 4 Rare 3,028
Grimy cadantine Grimy cadantine 1 4 Rare 1,992
Grimy lantadyme Grimy lantadyme 1 4 Rare 9,250
Grimy dwarf weed Grimy dwarf weed 1 4 Rare 10,592


  Item Quantity Rarity GE Market Price
Coins 100 Coins 27, 28, 42, 70, 137 2 Common Not sold
Raw lobster Raw lobster 1 2 Common 229
Raw bass Raw bass 1 2 Common 458
Tinderbox Tinderbox 1 2 Common 119
Casket Casket 1 4 Rare 5,814
Rock-shell splinter Rock-shell splinter 1 3 Uncommon 11,196
Rock-shell chunk Rock-shell chunk 1 4 Rare 5,456
Rock-shell shard Rock-shell shard 1 4 Rare 9,620
Clue scroll Clue scroll (medium) 1 5 Very rare Not sold
Ancient effigy Starved ancient effigy 1 5 Very rare Not sold

Rare drop table dropsEdit

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
Item Quantity Rarity GE Market Price
Coins 250 Coins 250 – 450; 3,000;
9,000; 10,000; 12,000
2 Common Not sold
Uncut sapphire Uncut sapphire 1 2 Common 1,405
Uncut emerald Uncut emerald 1 2 Common 3,148
Uncut ruby Uncut ruby 1 2 Common 3,240
Uncut diamond Uncut diamond 1 3 Uncommon 6,722
Loop half of a key Loop half of a key 1 3 Uncommon 19,784
Tooth half of a key Tooth half of a key 1 3 Uncommon 41,520
Uncut dragonstone Uncut dragonstone 1 4 Rare 14,664
Dragonstone Dragonstone 1 4 Rare 10,352
Dragon dagger Dragon dagger 1 3 Uncommon 16,556
Rune battleaxe Rune battleaxe 1 4 Rare 24,054
Rune javelin Rune javelin 5 4 Rare 880
Adamant javelin Adamant javelin 20 5 Very rare 1,120
Rune 2h sword Rune 2h sword 1 5 Very rare 37,543
Rune spear Rune spear 1 5 Very rare 11,312
Dragon spear Dragon spear 1 5 Very rare 36,127
Dragon dagger Dragon dagger 50 (noted) 5 Very rare 827,800
Rune sq shield Rune sq shield 1 5 Very rare 22,359
Rune kiteshield Rune kiteshield 1 5 Very rare 31,832
Shield left half Shield left half 1 5 Very rare 64,166
Dragon helm Dragon helm 1 5 Very rare 60,262
Adamant bolts 5 Adamant bolts 200 3 Uncommon 12,200
Onyx bolts 5 Onyx bolts 150 4 Rare 1,257,300
Rune arrow 5 Rune arrow 150–200, 500 4 Rare 22,350–74,500
Battlestaff Battlestaff 200 (noted) 4 Rare 1,594,000
Air orb Air orb 1,000 (noted) 4 Rare 2,908,000
Fire orb Fire orb 1,000 (noted) 4 Rare 2,097,000
Vecna skull Vecna skull 1 5 Very rare 140,908
Water talisman Water talisman 1 3 Uncommon 11,536
Earth talisman Earth talisman 25–35 (noted) 3 Uncommon 35,050–49,070
Fire talisman Fire talisman 25–35 (noted) 3 Uncommon 41,850–58,590
Chaos talisman Chaos talisman 1 3 Uncommon 665
Nature talisman Nature talisman 1 3 Uncommon 447
Pure essence Pure essence 500–15,000 (noted) 3 Uncommon 6,500–195,000
Nature rune Nature rune 20–80 4 Rare 6,480–25,920
Soul rune Soul rune 20 4 Rare 2,860
Law rune Law rune 45 4 Rare 13,185
Death rune Death rune 50, 121 4 Rare 5,650–13,673
Blood rune Blood rune 50 4 Rare 10,400
Raw swordfish Raw swordfish 125–250, 1,000 (noted) 3 Uncommon 39,375–315,000
Raw shark Raw shark 250–500 (noted) 3 Uncommon 411,250–822,500
Big bones Big bones 150–500 (noted) 3 Uncommon 86,250–287,500
Coal Coal 150–7,500 (noted) 3 Uncommon 28,800–1,440,000
Adamantite ore Adamantite ore 150–800 (noted) 3 Uncommon 370,650–1,976,800
Silver ore Silver ore 100 (noted) 4 Rare 10,300
Runite ore Runite ore 100 (noted) 4 Rare 1,055,400
Adamant bar Adamant bar 1,000–7,000 (noted) 4 Rare 3,404,000–23,828,000
Rune bar Rune bar 1, 50, 150 (noted) 4 Rare 13,124–1,968,600
Clean ranarr Clean ranarr 33 (noted) 3 Uncommon 105,567
Clean toadflax Clean toadflax 25–250 (noted) 3 Uncommon 108,925–1,089,250
Clean snapdragon Clean snapdragon 30–120 (noted) 3 Uncommon 128,490–513,960
Clean torstol Clean torstol 10–100 (noted) 3 Uncommon 63,880–638,800
Saradomin brew (4) Saradomin brew (4) 250 (noted) 5 Very rare 99,000
Watermelon seed 5 Watermelon seed 3 3 Uncommon 8,700
Yew seed 5 Yew seed 1–50 4 Rare 67,803–3,390,150
Magic seed 5 Magic seed 1–7 4 Rare 155,959–1,091,713
Palm tree seed 5 Palm tree seed 10 4 Rare 996,730
Herb seed 5 Snapdragon seed 1 4 Rare 1,406
Herb seed 5 Torstol seed 1–31 4 Rare 16,095–498,945
Fellstalk seed 5 Fellstalk seed 2 4 Rare 1,858
Yew logs Yew logs 50–20,000 (noted) 4 Rare 26,350–10,540,000
Crystal triskelion fragment 1 Crystal triskelion fragment 1 1 5 Very rare Not sold
Crystal triskelion fragment 2 Crystal triskelion fragment 2 1 5 Very rare Not sold
Crystal triskelion fragment 3 Crystal triskelion fragment 3 1 5 Very rare Not sold

Universal dropsEdit

Universal drops are dropped by every monster outside of Daemonheim.
These drops are dropped alongside main drops.
  Item Quantity Rarity GE Market Price
Key token Key token 1 4 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.

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