Rock Crabs are aggressive monsters that look like harmless rocks while disguised, but attack when walked by. Unlike most other enemies and NPCs, Rock Crabs are not marked with yellow dots on the player's minimap; this is probably due to the crabs' appearance, which camouflages them as rocks.
Players can tell if a rock is a Rock Crab by looking at the rock's shape; Rock Crabs are tall oval shaped while normal rocks in their area are mostly in large clusters of shattered pieces. Another way to tell is by right clicking on them. If the text colour is yellow, it is a Rock Crab. If the text is blue, it is just a prop.
Rock Crabs become docile if the player has not left the surrounding area in a certain amount of time (roughly between ten and twenty-five minutes). To make the crabs aggressive again, exit the surrounding area (halfway to the entrance to the village in Rellekka, or by entering and exiting the entrance to Keldagrim) and enter again. You can also find one Rock Crab that will be aggressive, kill it then you can continue killing other crabs. As they are "dormant" until "awoken" by a passing player, rock crabs cannot be attacked until they are made aggressive once more.
Rock Crabs are excellent for training at all combat levels due to their low Defence and high Hitpoints, though low level players should consider bringing food. Rock Crabs used to be a popular melee training monster until the release of Sand Crabs, and the subsequent release of Ammonite Crabs, which are now more preferred options for training.
Rellekka Rock Crabs
CAUTION: Dwarf multicannons may be used here, unlike with the other types of crabs commonly used for training, This makes training for other players difficult. There is, however, a way to avoid the cannon's fire. If a player moves to the west-most part of the multi-combat zone, most cannon fire can be avoided. There are three rock crab spawns near this location, which makes it a decent spot. Although the cannon's fire can be avoided, it is best to switch to another world when faced with overcrowding.
Item Quantity Rarity GE market price Bronze pickaxe 1 Common 85 Iron pickaxe 1 Common 51 Bronze axe 1 Uncommon 96
Runes and talisman
Item Quantity Rarity GE market price Fire rune 7 Common 35 Nature rune 4 Uncommon 1,056 Chaos rune 1 Rare 71
Item Quantity Rarity GE market price Coins 4–413 Common Not sold Oyster 1–2 Common 76–152 Seaweed 1–5 Common 38–190 Oyster pearl 1 Common 61 Empty oyster 1 Common Not sold Spinach roll 1 Uncommon Not sold Knife 1 Uncommon 78 Opal bolt tips 5 Uncommon 35 Iron ore 1 Uncommon 47 Coal 2 Uncommon 294 Copper ore 3 Uncommon 126 Tin ore 3 Uncommon 102 Fishing bait 1–10 Uncommon 4–40 Edible seaweed 2 Rare 34 Jade bolt tips 1 Rare 3 Limpwurt root 1 Rare 837 Grimy ranarr weed 1 Rare 10,698 Grimy avantoe 1 Rare 1,528 Tarromin seed 1 Rare 18 Ranarr seed 1 Rare 70,113 Clue scroll (easy) 1 Rare Not sold Casket 1 Rare 829
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 1 Rare 448 Uncut emerald 1 Rare 691 Uncut ruby 1 Rare 1,284 Cosmic talisman 1 Very rare 745 Uncut diamond 1 Very rare 2,674 Rune javelin 5 Very rare 740 Loop half of key 1 Very rare 9,766 Tooth half of key 1 Very rare 9,768 Rune spear 1 Very rare 11,938 Shield left half 1 Very rare 65,560 Dragon spear 1 Very rare 36,963