All mages are given two choices. I think all characters are..
In our case, we can choose to be an ice mage following the Ace belief path or a fire mage following the magic belief path. Both are good. Ice decreases enemies' defense but damage is average. If you're a killer type and loves going solo, fire is the way to go. But if you are the "killing me softly" type
and wants your enemy to feel your wrath, the ace belief is your path to greatness. It depends on your preference