Glad to get more of this. He's being a proper necromancer he is. Necromancers were never inherently evil, they were simply those who communed with spirits. Much like any medium or priest would they can lay the spirits of people to rest or work with them willingly. I mean calling upon ancestors as a Shaman type character was always a prime example of this.
Anyone can be evil. Anyone can do wrong with any power. A paladin can serve an unjust god of light and wield holy powers is the most horrible ways because it is just by his gods definition which to a paladin is what actually matters, not true "good or evil".