Spiritual Force

Spiritual Force is both the measure and the fuel of magic. Magi build it through meditation and mental discipline; the higher the rank, the greater and denser the Spiritual Force and the more complex the arrays a Magus can hold.

Magic here is closer to exact science than to miracle: spells are assembled from runic formulas and arrays, and whoever computes faster and more precisely wins. This is exactly why the AI chip gives Leylin such an edge.