HOMM 5 - Godlike Necromancer: Owning mortal Mage

Battle from the custom map "An Island of One's Own" Played on Heroic Level. I could have finished the map way faster (like month 4) but I visited every bonus stat building on the map and got best items just for fun. Raven's skills: Expert Destruction Magic Expert Dark Magic Expert Summoning Magic Expert Enlightment Expert Sorcery Attack - 14 Deffence - 29 Spellpower - 34 Knowledge - 20