Woops, I meant to say he refuses to do so.
The Grand Master is doing what my other mages are doing, which is casting Flare or Fireball and then switching to Holy Pyre and Falling Fires when the enemy gets within range.
Anyway, it may well be that the AI has decided it's not worth expending the gems because I've been fighting small and medium-sized armies.
If it still doesn't work when I'm fighting larger armies, I'll post again.
Thanks for the help guys.
