Skald seems to be the best - song of helheim is pretty sweet against udead, and diversions made some battles extremly easy, when 2 archer stacks dont make a move on first round you know you won the lottery
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But yeah Ahriman seems to be only doable with heavy Call of Nature abuse. I think main problem is that you cannot level your rage spells from the start, which leads to doing dmg only from units who are mostly melee that get retaliated.