I don't think you know why crumbles got nerfed: When slayer came out it was possible to autocast crumbles due to the new slayer staff. People bought huge amount of chaos and dressed in full rune+staff and went head to head combat with a 18 zombie. They would never hit, still the base xp made this very fast and cheap, not to mention you could practicly afk the whole day just checking for random events once in a while with sound on and wearing ring of life. It was fun, but then Jagex halfed the base xp. :cry: (Still possible though, with almost every spell. :P )