Oh, and if you have a 3E/1S caster, you can always try Gifts from Heaven. It's not too precise, but with quickness you can toss six meteors a turn at 150 pts each.
900 points in one turn would wipe the smile off the face of even a Sphinx.
Granted, a 3E caster is probably better used casting Weapons of Sharpness so even your regular troops get the AP flag, while an astral mage could go for Astral Weapon then start swinging if he's buff enough.