Tactics for Dungeon.

There will never be such a thing; vampires can only defeat demons, but never a gorgon, and generally not a minotaur either.

Have you tried conducting such 1v1 battles with heroes having 0.0.1.1 stats and without skills that affect the battle, on neutral ground? I repeat: a vampire lord wins against all 5 levels, except for the minotaur king. The probability of winning against a mighty gorgon is more than 50%.
Of course, in a battle, say, 30x30, the result will be different.