Mana powered Magic does not work on worlds with no mana but Sanctity powered magic can. Note that Mana Enhancer changes this somewhat.
Very High ManaEdit
Anyone who knows spells can cast them. Very high mana worlds make magic common and more potent, affecting some rules. First, a mage who spends FP (Fatigue Points) to cast a spell on his turn gets those FP back at the start of his next turn. Second, all failures are treated as critical failures – and actual critical failures produce spectacular disasters!
Anyone who knows spells can cast them.
Only mages can cast spells. This is the default mana level in most fantasy settings: mages use magic, others don’t.
Only mages can cast spells. Low mana worlds make magic rare and less potent, affecting some rules. First, all spells perform at -5 to skill, for all purposes. Magic items are similarly affected; see Power of a Magic Item, 4th Edition Basic Set, p. 481. Second, critical failures have mild effects or no effect at all.
No one can use magic at all. Magic items do not function (but regain their powers when taken to an area with mana). This mana level occurs in isolated spots in magical worlds, but entire worlds can lack mana, making mana based magic use impossible.