Casting Attribute
At character creation, the mage must choose an Attribute to be used for the rolls to cast spells; this is called the Casting Attribute. This must be either Muscle, Intellect, or Presence. A mage can use this chosen attribute as the one that influences their MP score. By default, a character uses Intellect to calculate MP, but it could be Muscle or Presence at the player's option.
Mages who use Muscle to cast forcibly pull mana from themselves or the world around them to fuel spells; they are often daring or rash. Mages who use Intellect know the ins and outs of the operation of mana and the ways to make it perform; they are often calculating and analytical. Mages who use Presence simply will their mana to act; they are often confident or arrogant.