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What's wrong with playing as Haven against Orcs? It's fun at first, 30 Assassins are powerful... As for my build, I focus on Education (which gives Magic Affinity), Sorcery (abilities that reduce mana costs), Attack (Haste spell), Luck, and Chaos Magic. I also take Chains and Arcane Wave. But right now, I'm having trouble with a lucky Sorcerer.