Dark Ages

Fortification
OP of the spellcaster = 0
+70% Willpower
6 Action Points
3 turns

Cast Fortification -> Cast Fortification -> Cast Fortification -> Cast Fortification...
And so on, infinitely, gaining more and more Action Points and increasingly powerful attacks. Or does "magic of earth efficiency" not affect the bonus to Willpower?

Added 1 minute ago

Increases indirect damage. For example, Burning. Other spells -- no.

Fire Shield? Otherwise, it seems much less useful in this form.