Amko
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The demon has two tactics:
1) For a long game: Luck (take Deadly Blow), Gating, Darkness, Logistics, Attack (with Devil's Strike), Education, and for the finale, Call of Urgash!
2) For a short game: Luck, Gating, Chaos (Drain Life is a must!), spellcasting with Corpse Explosion, and if possible, defense with Fire Retribution.
P.S. I vote for the long-game skills. :)