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I think you underestimate water magic. I upgraded it for Anastasia (from the Necropolis campaign) and defeated a high-level demon (froze them all solid :D), while it only takes them one or two turns to remove control (and a controlled unit attacks). My winning strategy: slippery ground + ice storm + vampires/ghouls/lamassu = the strongest enemy units (devastators, sadists, pit lords) just stand there while I take out the rest.
