Old School RuneScape Wiki

The locations of the coloured spices the Behemoths guard.

Hell-Rat Behemoths are found in Evil Dave's basement in Edgeville and can only be accessed after completing the Evil Dave subquest in Recipe for Disaster. They guard a 4 dose coloured spice (red, yellow, orange, or brown) and must be killed in order to obtain it.

Hell-Rat Behemoths are caught by having your cat enter the curtains and fight them, just like the King rat during the Ratcatchers quest. The player will then enter an instanced area where their cat and the rat will face off. The Hell-Rat Behemoth has 15 hitpoints. Should the fight prove to be too difficult, players can walk away to exit the instance with their cat unharmed.

A wily cat and a Hell-Rat Behemoth face off.

The player can give their cat fish or milk to heal them by using them on the curtain. Catching and using Karambwanji to heal your cat is suggested as they are stackable. It is highly recomended that players use wily cats as they will be able to stand up to the rat much more effectively than a normal cat will. If the cat dies during the fight, it is permanently lost and players will have to obtain another kitten from Gertrude.

When successfully defeated, the player will exit the instance and will automatically be given the four-dosed spice that the Behemoth was guarding. If the player's inventory is full, it will be dropped on the floor right under the player.

Normal cats instantly become hellcats after killing a behemoth.