When mages don't cast...

[Einthoven]

Originally posted by Graeme Dice:
How many/how tough were the opponents you were facing? The AI doesn't use gems to cast big spells if it doesn't think that there will be enough benefit. This is useful to prevent a mage from burning off it's gems when a single scout attacks instead of the army you were expecting.

Wow. That's a smart AI. As it turns out it was a province with fairly low defense and a handfull of weak defenders. No threat to my army at all, so perhaps that is what happened. I was wondering whether it might have been the fact that the spell costs 100 fatigue to cast, but perhaps that wasn't it.