Cheiromancer
Adventurer
Any forsaker who willingly violates those strictures by using magic items or casting spells loses all special abilitites of the prestige class and can progress no further as a forsaker.
What counts as "special abilites of the prestige class"? This question applies as well to an ex-paladin who "loses all special abilities and spells, including the service of the paladin's warhorse."
I am pretty sure that the character retains hit points, BAB and save progressions, and skill points. I'm also pretty sure that supernatural and spell-like abilities are lost- but that doesn't help much for the forsaker. Especially for something like an inherent ability bonus; is an inherent bonus (such as granted by a wish) a "special ability"?
Anybody have any general rule that could be applied fairly?