[Wish]

the magic strength, as determined by the points dumped in, or later gems used to empower, and maybe various magic items, determine how strong a spell he can cast. (in the research this will be indicated by matching icons.)

essentially as the game starts it indicates the potential of the pretender to cast spells - once the research for the spell is complete.

on a pretender, it also determines blessing bonus effects and has some minor advantages for the mage, himself (i.e. astral increases MR, fire increases Attack, etc.)