Guarg in Heroes 5

The Confusion spell has an additional effect of decreasing target's mana on one point per every hero level.

Some brave men, who are dead now, used to say that Guarg is "not entirely demon". Anyone who will make a look in his eyes with stretched out pupils can decide this. But it is better not to say it aloud - Guarg can cruelly punish the offender depriving him of his magical power.