Why do you think that? It was nerfed before slayer came out Are you sure? I remember them halving the xp after the slayer staff came out. * I just found this in the Tip.it Times highlights of 2005: "Slayer Skill (26-Jan) The Slayer skill introduced a wide range of useful features to the game. Firstly the Magic dart spell and the Slayer staff. Magic dart was popular to use for the upcoming barrows update. The slayer staff opened up a new way of training magic, with the staff being able to autocast the Crumble undead spell. However Jagex later spoilt that when the experience you received from casting Crumble undead was greatly decreased (halved)."