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If we exclude absolute superiority (black dragon, dragon lord) and neutral creatures, I like the Devil. It has 50% immunity to life drain and deals 50% more life drain damage. Its speed is incredibly high – it can move in one turn and reach the walls of a besieged city. It deals decent damage and also summons ice demons, which is very useful. Among neutral creatures, I would choose the Champion of the Dark – a very formidable warrior.
Dark Messiah