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In Heroes of Might and Magic III, Ghosts didn't have that ability, and they were normally vulnerable to attacks. But the fact that they drained mana and recovered health each turn made them dangerous opponents. Especially in the hands of a Necromancer.
How much mana do they drain per turn... only 2 spell points... and as far as I remember, the Necromancer only increases their attack and defense...
Stay still, so I can kill