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I don't use autobattle at all. Phoenix is a powerful bird, and summoning it requires skillful summoning magic. In the patched game, autobattle is disabled during the battle with Godric. When I play as Necropolis, I actively use dark spells – mainly enslavement and berserk. Less often – blindness and others. Blindness can be removed by your own ballista. And raising the dead is specifically designed for Necromancers. As a Warrior, you can easily do without a phoenix.
I really like the Unholy Word spell.