Actually, the main reason I wanted to learn to play Illians was for multiplayer, so I don't care about Auric really(though it would be nice to get the trophy). Most games have someone who goes Hyborem, and I usually go Basium to counter, and I'm getting tired of being Basium. Illians sounded like something new, since Snowfall does excellent damage(and demons aren't resistenct to it) and Hell Terrain can't spread in ice(well, not the hell terrain demons get combat boosts from). Also, if someone else summons Basium, I could probably work some sort of deal out with the human instead of the AI hating me for being Evil. I mean, we both want to kill demons, right?
If Unrestricted Leaders is on(sometimes is for multiplayer), I might even go Financial. I would then have 3

3

Ice farms, and best of all would be useless for anyone who conquers me(best they could get is 2

with Agarianism) Even with Scorch, it would still only be Tundra - they would need Vitalize to get a truly productive city.