Oelm
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Dirtry, experiment with Mullich in single-player mode; many things will become clear. I myself didn't understand what made him so great. And in Fortress, giving up the first turn without a serious reason is not a good idea (as LDim once wrote). If you compare him to other heroes, Galtran with a Castle is almost unbeatable; paired with any other Necromancer, you win about 70-80% of the time, if not more. But Galtran might not appear. And Mullich is always available.