Giant rock crab
Giant Rock Crab
Release date 1 August 2005 (Update)
Members? Yes
Combat level 137
Always drops Bones
No one likes crabs... especially really big ones!
Disguised as a boulder:
Heavy rock!
Combat info
Hitpoints 180
Aggressive Yes
Poisonous No
Max hit 9
Weakness Magic
Attack Styles
Melee (crush)
Slayer icon Slayer info
Not assigned
Combat icon Combat stats
Attack icon Strength icon Defence icon Magic icon Ranged icon
50 80 200 1 1
Attack icon Aggressive stats
White dagger White scimitar White warhammer Magic icon Ranged icon
+0 +0 +0 +0 +0
Defence icon Defensive stats
White dagger White scimitar White warhammer Magic icon Ranged icon
+225 +200 +175 -10 +250
Other bonuses Immunities
Attack icon
Strength icon
Ranged Strength icon
Magic Damage icon
Poison hitsplat
Venom hitsplat
+0 +0 +0 +0% Not immune Not immune
Attack speed
Monster attack speed 6

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 cast a spell on them gives the message "You can't attack this NPC."

Giant rock crabs are only initially aggressive if they are approached while dormant. Once they are moving and the targeted player is out of range, they stop being aggressive and will ignore players that don't attack them. They eventually become dormant boulders again after a while if they are not attacked.



The giant rock crab is one of few monsters in RuneScape that will retreat from battle when they become critically wounded. This can be troublesome, as they are found in a single-way combat area. This can be prevented by attacking them while their back is turned to a nearby wall, so that they move away from the player and back up into the wall. If they move too far away, the player will follow them and risk being attacked by another rock crab. There are several protruding sections of the walls in the area that can be used as safespots which are ideal as the crabs' main weakness is magic.



Item Quantity Rarity GE market price
Bones Bones 1 Always 53


Item Quantity Rarity GE market price
Water rune Water rune 1–39 Uncommon 5–195
Earth rune Earth rune 2–37 Uncommon 10–185
Air talisman Air talisman 1 Rare 63
Mind talisman Mind talisman 1 Rare 1,095
Fire talisman Fire talisman 1 Rare 2,021
Cosmic talisman Cosmic talisman 1 Rare 770
Body talisman Body talisman 1 Rare 883
Water talisman Water talisman 1 Rare 176
Earth talisman Earth talisman 1 Rare 196


Item Quantity Rarity GE market price
Steel platebody Steel platebody 1 Uncommon 977
Black claws Black claws 1 Uncommon 655
Black platebody Black platebody 1 Uncommon 4,441
Mithril axe Mithril axe 1 Uncommon 170
Rock-shell gloves Rock-shell gloves 1 Uncommon 645
Rock-shell boots Rock-shell boots 1 Uncommon 624
Black warhammer Black warhammer 1 Rare 380
Adamant longsword Adamant longsword 1 Rare 1,685
Adamant warhammer Adamant warhammer 1 Rare 2,225


Item Quantity Rarity GE market price
Poison ivy seed 5 Poison ivy seed 1 Uncommon 535
Belladonna seed 5 Belladonna seed 1 Uncommon 105
Herb seed 5 Guam seed 1 Uncommon 6
Herb seed 5 Marrentill seed 1 Uncommon 4
Herb seed 5 Tarromin seed 1 Uncommon 5
Herb seed 5 Harralander seed 1 Uncommon 32
Herb seed 5 Toadflax seed 1 Rare 3,439
Herb seed 5 Ranarr seed 1 Rare 42,083
Herb seed 5 Irit seed 1 Rare 87
Herb seed 5 Avantoe seed 1 Rare 1,195
Herb seed 5 Snapdragon seed 1 Rare 50,684
Herb seed 5 Cadantine seed 1 Rare 996
Herb seed 5 Lantadyme seed 1 Rare 1,911
Herb seed 5 Dwarf weed seed 1 Very rare 1,396
Herb seed 5 Torstol seed 1 Very rare 79,515


Item Quantity Rarity GE market price
Grimy guam leaf Grimy guam leaf 1 Uncommon 11
Grimy marrentill Grimy marrentill 1 Uncommon 13
Grimy tarromin Grimy tarromin 1 Uncommon 127
Grimy harralander Grimy harralander 1 Uncommon 662
Grimy ranarr weed Grimy ranarr weed 1 Rare 7,820
Grimy irit leaf Grimy irit leaf 1 Rare 860
Grimy avantoe Grimy avantoe 1 Rare 1,994
Grimy kwuarm Grimy kwuarm 1 Rare 1,686
Grimy cadantine Grimy cadantine 1 Rare 1,439
Grimy lantadyme Grimy lantadyme 1 Rare 1,527
Grimy dwarf weed Grimy dwarf weed 1 Rare 1,001


Item Quantity Rarity GE market price
Coins 100 Coins 27; 28; 42; 70; 137 Common Not sold
Raw lobster Raw lobster 1 Common 269
Raw bass Raw bass 1 Common 304
Tinderbox Tinderbox 1 Common 105
Rock-shell splinter Rock-shell splinter 1 Uncommon (1/64) 22,088
Rock-shell chunk Rock-shell chunk 1 Uncommon (1/64) 11,495
Rock-shell shard Rock-shell shard 1 Uncommon (1/64) 18,709
Casket Casket 1 Rare 820
Clue scroll (medium) Clue scroll (medium) 1 Very rare Not sold

Gem drop table

In addition to the drops above, this monster has access to the gem drop table.

Show/hide gem drop table
Item Quantity Rarity GE market price
Uncut sapphire Uncut sapphire 1 Rare 1,006
Uncut emerald Uncut emerald 1 Rare 948
Uncut ruby Uncut ruby 1 Rare 1,792
Nature talisman Nature talisman 1 Very rare 940
Uncut diamond Uncut diamond 1 Very rare 3,709
Rune javelin Rune javelin 5 Very rare 755
Loop half of key Loop half of key 1 Very rare 9,184
Tooth half of key Tooth half of key 1 Very rare 13,416
Rune spear Rune spear 1 Very rare 12,091
Shield left half Shield left half 1 Very rare 65,665
Dragon spear Dragon spear 1 Very rare 37,118