I could be wrong, but I think that the aurora engine gives bonus "spells per day" based on your intelligence multiplier. i.e.:
int. =12, gives an extra level 1 spell per day to your base.
int. =14, gives an extra level 2 spell per day to your base.
int. =16, gives an extra level 3 spell per day to your base.
etc.
it SHOULD also give greater spell penetration in a similar progression as above, but wether it does or not is anyones guess.
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