to fail get the highest negative mage bonus u can. (i use full rune except for staff i need earth, thosse stronghold boots, no ammy and dragon vambs.) bronze can be subbed for rune. Preferbly u need like a -68 bonus for it to "fail" when u still get 29 xp, all the time. Don't fail on spells that give u base xp (combat spells) as u will only get the base xp.