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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.

LocationsEdit

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.

StrategyEdit

Steel full helm detail old
Due to an update, the information in this article may be out-of-date.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.


Giant Rock Crabs are extremely resistant to Melee and Ranged attacks, and thus are only effectively killed using Magic.

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.

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.

RetreatEdit

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.

DropsEdit

100%Edit

  Item Quantity Rarity GE Market Price
Bones Bones 1 1 Always 362

Runes/TalismansEdit

  Item Quantity Rarity GE Market Price
Water rune Water rune 1–39 2 Common 37–1,443
Earth rune Earth rune 2–37 2 Common 40–740
Air talisman Air talisman 1 3 Uncommon 125
Mind talisman Mind talisman 1 3 Uncommon 280
Fire talisman Fire talisman 1 3 Uncommon 2,778
Cosmic talisman Cosmic talisman 1 4 Rare 2,749
Body talisman Body talisman 1 4 Rare 228
Water talisman Water talisman 1 3 Uncommon 12,616
Earth talisman Earth talisman 1 3 Uncommon 2,771
Nature talisman Nature talisman 1 4 Rare 363
Chaos talisman Chaos talisman 1 3 Uncommon 968

Weaponry/ArmourEdit

  Item Quantity Rarity GE Market Price
Steel platebody Steel platebody 1 2 Common 1,225
Black claw Black claw 1 3 Uncommon [1] 360
Off-hand black claw Off-hand black claw 1 3 Uncommon [1] 1,457
Black platebody Black platebody 1 2 Common 1,857
Mithril hatchet Mithril hatchet 1 2 Common 105
Rock-shell gloves Rock-shell gloves 1 3 Uncommon 26,973
Rock-shell boots Rock-shell boots 1 3 Uncommon 10,168
Black warhammer Black warhammer 1 3 Uncommon 446
Off-hand black warhammer Off-hand black warhammer 1 3 Uncommon 336
Adamant longsword Adamant longsword 1 3 Uncommon 1,399
Adamant warhammer Adamant warhammer 1 4 Rare 2,566
  1. ^ a b Main hand and off hand claws are dropped together.

CharmsEdit

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

30–33%

43–46%

9–11%

10–12%

3–4%

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).


SeedsEdit

  Item Quantity Rarity GE Market Price
Poison ivy seed 5 Poison ivy seed 1 3 Uncommon 6
Belladonna seed 5 Belladonna seed 1 3 Uncommon 76
Herb seed 5 Guam seed 1 3 Uncommon 5
Herb seed 5 Marrentill seed 1 3 Uncommon 18
Herb seed 5 Tarromin seed 1 3 Uncommon 12
Herb seed 5 Harralander seed 1 3 Uncommon 9
Herb seed 5 Toadflax seed 1 4 Rare 3,229
Herb seed 5 Ranarr seed 1 4 Rare 1,555
Herb seed 5 Irit seed 1 4 Rare 229
Herb seed 5 Avantoe seed 1 4 Rare 2,298
Herb seed 5 Snapdragon seed 1 4 Rare 1,514
Herb seed 5 Cadantine seed 1 4 Rare 906
Herb seed 5 Lantadyme seed 1 4 Rare 35,976
Herb seed 5 Dwarf weed seed 1 5 Very rare 45,431
Herb seed 5 Torstol seed 1 5 Very rare 36,273

HerbsEdit

  Item Quantity Rarity GE Market Price
Grimy guam Grimy guam 1 3 Uncommon 728
Grimy marrentill Grimy marrentill 1 3 Uncommon 122
Grimy tarromin Grimy tarromin 1 3 Uncommon 40
Grimy harralander Grimy harralander 1 3 Uncommon 153
Grimy ranarr Grimy ranarr 1 4 Rare 2,843
Grimy irit Grimy irit 1 4 Rare 2,601
Grimy avantoe Grimy avantoe 1 4 Rare 4,527
Grimy kwuarm Grimy kwuarm 1 4 Rare 4,151
Grimy cadantine Grimy cadantine 1 4 Rare 2,090
Grimy lantadyme Grimy lantadyme 1 4 Rare 9,554
Grimy dwarf weed Grimy dwarf weed 1 4 Rare 9,513

OtherEdit

  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 305
Raw bass Raw bass 1 2 Common 420
Tinderbox Tinderbox 1 2 Common 169
Casket Casket 1 4 Rare 5,637
Rock-shell splinter Rock-shell splinter 1 3 Uncommon 12,830
Rock-shell chunk Rock-shell chunk 1 4 Rare 6,482
Rock-shell shard Rock-shell shard 1 4 Rare 12,772
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 1,543
Uncut emerald Uncut emerald 1 2 Common 2,792
Uncut ruby Uncut ruby 1 2 Common 3,993
Uncut diamond Uncut diamond 1 3 Uncommon 6,313
Loop half of a key Loop half of a key 1 3 Uncommon 17,750
Tooth half of a key Tooth half of a key 1 3 Uncommon 38,320
Uncut dragonstone Uncut dragonstone 1 4 Rare 14,953
Dragonstone Dragonstone 1 4 Rare 10,390
Dragon dagger Dragon dagger 1 3 Uncommon 16,551
Rune battleaxe Rune battleaxe 1 4 Rare 24,216
Rune javelin Rune javelin 5 4 Rare 860
Adamant javelin Adamant javelin 20 5 Very rare 1,220
Rune 2h sword Rune 2h sword 1 5 Very rare 37,453
Rune spear Rune spear 1 5 Very rare 11,389
Dragon spear Dragon spear 1 5 Very rare 36,901
Dragon dagger Dragon dagger 50 (noted) 5 Very rare 827,550
Rune sq shield Rune sq shield 1 5 Very rare 22,011
Rune kiteshield Rune kiteshield 1 5 Very rare 31,814
Shield left half Shield left half 1 5 Very rare 64,266
Dragon helm Dragon helm 1 5 Very rare 59,038
Adamant bolts 5 Adamant bolts 200 3 Uncommon 13,400
Onyx bolts 5 Onyx bolts 150 4 Rare 1,258,050
Rune arrow 5 Rune arrow 150–200, 500 4 Rare 22,650–75,500
Battlestaff Battlestaff 200 (noted) 4 Rare 1,604,200
Vecna skull Vecna skull 1 5 Very rare 104,649
Water talisman Water talisman 1 3 Uncommon 12,616
Earth talisman Earth talisman 25–35 (noted) 3 Uncommon 69,275–96,985
Fire talisman Fire talisman 25–35 (noted) 3 Uncommon 69,450–97,230
Chaos talisman Chaos talisman 1 3 Uncommon 968
Nature talisman Nature talisman 1 3 Uncommon 363
Pure essence Pure essence 500–15,000 (noted) 3 Uncommon 9,500–285,000
Nature rune Nature rune 20–80 4 Rare 5,760–23,040
Soul rune Soul rune 20 4 Rare 5,060
Law rune Law rune 45 4 Rare 15,255
Death rune Death rune 50, 121 4 Rare 10,450–25,289
Blood rune Blood rune 50 4 Rare 16,000
Raw swordfish Raw swordfish 125–250, 1,000 (noted) 3 Uncommon 51,625–413,000
Raw shark Raw shark 250–500 (noted) 3 Uncommon 478,000–956,000
Big bones Big bones 150–500 (noted) 3 Uncommon 107,700–359,000
Coal Coal 150–7,500 (noted) 3 Uncommon 41,250–2,062,500
Adamantite ore Adamantite ore 150–800 (noted) 3 Uncommon 319,350–1,703,200
Silver ore Silver ore 100 (noted) 4 Rare 8,900
Runite ore Runite ore 100 (noted) 4 Rare 1,132,400
Adamant bar Adamant bar 1,000–7,000 (noted) 4 Rare 3,688,000–25,816,000
Rune bar Rune bar 1, 50 (noted) 4 Rare 14,436–721,800
Clean toadflax Clean toadflax 25–250 (noted) 3 Uncommon 132,550–1,325,500
Clean snapdragon Clean snapdragon 30–120 (noted) 3 Uncommon 136,950–547,800
Clean torstol Clean torstol 10–100 (noted) 3 Uncommon 93,630–936,300
Watermelon seed 5 Watermelon seed 3 3 Uncommon 8,076
Yew seed 5 Yew seed 1–50 4 Rare 69,958–3,497,900
Magic seed 5 Magic seed 1–7 4 Rare 139,865–979,055
Palm tree seed 5 Palm tree seed 10 4 Rare 1,368,780
Herb seed 5 Snapdragon seed 1 4 Rare 1,514
Yew logs Yew logs 50–20,000 (noted) 4 Rare 20,750–8,300,000
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
Brawling gloves (Melee) Brawling gloves (Melee) 1 5 Very rare Not sold
Brawling gloves (Magic) Brawling gloves (Magic) 1 5 Very rare Not sold
Brawling gloves (Ranged) Brawling gloves (Ranged) 1 5 Very rare Not sold
Brawling gloves (Agility) Brawling gloves (Agility) 1 5 Very rare Not sold
Brawling gloves (Cooking) Brawling gloves (Cooking) 1 5 Very rare Not sold
Brawling gloves (FM) Brawling gloves (FM) 1 5 Very rare Not sold
Brawling gloves (Fishing) Brawling gloves (Fishing) 1 5 Very rare Not sold
Brawling gloves (Hunter) Brawling gloves (Hunter) 1 5 Very rare Not sold
Brawling gloves (Mining) Brawling gloves (Mining) 1 5 Very rare Not sold
Brawling gloves (Prayer) Brawling gloves (Prayer) 1 5 Very rare Not sold
Brawling gloves (Smithing) Brawling gloves (Smithing) 1 5 Very rare Not sold
Brawling gloves (Thieving) Brawling gloves (Thieving) 1 5 Very rare Not sold
Brawling gloves (WC) Brawling gloves (WC) 1 5 Very rare Not sold

Universal dropsEdit

Universal drops are dropped by nearly 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

TriviaEdit

  • 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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