User blog comment:Atmey/Mona the First Martyr/@comment-4966790-20130408092814/@comment-3529242-20130408102014

Think of it as a mana and mana regen, but you can't buy items for it, and the regen is really low, it will stay in 50~250 range most of the time, going B won't fill it like Mana, getting 500+ Faith is pretty hard but rewarding.