Slayer Weaken

Slayer Weaken is a spell that can be unlocked for 1000 slayer points. To use it, player need the runes and be wielding a slayer staff and also have 92 Magic and 92 Slayer. When cast on any slayer creature that requires an item to protect the player ot to kill it, the slayer creature loses the ability. This then allows for example players to kill turoths with regular weapons or kill rock slugs without using salt. The spell lasts for 2 minutes.