Alastor in Heroes 5

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

Alastor showed his skill at mind control at a tender age, as his childhood enemies took to wandering inexplicably into lava flows. Delighted by this precocious display of talent, the Sovereign permitted Alastor to study the arts of mental domination under the masters in Sheogh and later across all the lands of Ashan. Many a time have enemy troops, mesmerized by his gaze, come over to fight at the demons’ side.