Well, there could be combat magic specialists instead of Ether magic specialists.
Consider this ... you could either cast Fireballs, Pillars of Fire, Lightning Storms, and Tsunamis (powerful spells, wide area of effect)
OR
you could have self-enhancing spells only. Like greater-Ultra Magic Shield, Greater-Personal Levitation, Greater-Haste, Greater-Blade Quickening, Greater-Health Restoration .... and also some personal ranged spells like Chain Lighting and Flame fingers.
personally Im more a fan of the second one, however the occasional ether magic is cool too. I suppose I just like the "anime character" type of magic vs the Nuclear Bomb type of magic.
And of course, there will be the summoning of creatures magic, and the creation of undead magics. Perhaps these Sacrificial altars either add undead points (less maintanence for undead troops) or add a stockpile of bodies that can be trained into undead troops ... aka the more sacrifical temples you have, the more undead troops you could train/summon per turn.
I mean ... flying around the battle, shooting lighting from your finger tips, and landing to shred through the enemy ... very nice.