What skills should Necromancers take when facing Orcs on a very large map?

Necromancer needs Darkness (because Diminish only reduces the duration of Berserk, and if you have good magic skills, it will still last for 2 turns. Leadership is essential (I played on a large map and leveled up the ability to turn joining units into undead of the same level), Chaos (to scare neutral creatures and also to remove Fury), Attack, Defense, and Logistics.