Archmages' Hat in Heroes 4

Hero gains +10 spell points and regenerates 2 spell points per day and is granted the effects of Blur. A hero wearing the Archmage’s Hat, the Staff of Disruption, the Wayfaring Boots, the Ring of Flares, and the Angelfeather Cloak is granted the ability to ignore an enemy hero’s or creature’s magic resistance.

Though simple looking, this hat contains powerful enchantments to make the wearer more difficult to spot at range and to increase his magical energies.