Hellcat

A hellcat is a special variant of a normal cat that can be accessed after starting the Freeing Evil Dave sub-quest of Recipe for Disaster. During the quest, players must visit Evil Dave in his mother's basement. There they must use their cat to kill Hell-Rats, which have stolen his mother's special colored spices necessary to make the spicy stew necessary to free him. After your cat catches 7 rats, it will become corrupted by the demonic nature of the rats and will suddenly transform into a hellcat. Note that any existing hellcats may need to be placed in a menagerie, or transformed back in to an ordinary cat, in order for subsequent cats to be transformed. A hellcat can be turned back into a normal cat of the same colour it was before the conversion at any time by feeding it a bucket of milk.

A cat at any stage of growth can be a hellcat, and a cat that has become a hellcat will continue to age as normal. While it is impossible to convert an overgrown cat into an overgrown hellcat, since overgrown cats cannot catch rats, players can get an overgrown hellcat by allowing a hell-kitten or adult hellcat to age into an overgrown hellcat. Players who have completed Ratcatchers can also get wily and lazy hellcats, either by using their wily or lazy cats to catch Hell-Rats, or by taking an overgrown hellcat to Felkrash and having her train it.

Trivia

 * Clockwork cats cannot be turned into hellcats, since they cannot catch the rats.
 * If you are leading a hellcat in Varrock and a stray dog begins to follow you, your hellcat will hiss at it and the dog will flee for a short time.
 * When players select the shoo-away option for the hellcat, they say "Thank Zaros for that! Finally, some freedom from your ugly face!" which suggests that hellcats and hellrats worship Zaros.
 * Overgrown Hellcats may have the ability of mind-control, because if talking to it with a Catspeak amulet on, it will use the player as a catalyst and then have the player say what the Hellcat feels like.
 * Sometimes, kittens will turn into hellkittens after catching a single hellrat.
 * In some cases (while wearing their Catspeak amulet), when a player drops their hell-kitten, it will say "Lets go hunt some ork!" This is a reference to Lord of the Rings: The Fellowship of the Ring, when Aragon says "Lets hunt some ork."