[thejeff]

As bbz said: Dom 9 or 10 for awe. Extra death magic boosts his fear. Maybe Earth or Air if you need them for diversity. Earth for protection and later buffs, Air for Air Shield.

He doesn't kill people very well. Even militia. He just routes them quickly. He is vulnerable, since he has relatively low hp and protection. Pick your targets carefully. His flight will help with this. Keep him in dominion.
I would forge him minimal gear as soon as possible. Even a cheap shield and weapon will help.

But the fear is awesome. And he has full slots, which helps keep him useful late in the game.