Exactly. Although, most of his "evilness" just comes from the way he fights and carries himself. So far.

Necromancy is the black magic art of communicating with the dead for the purpose of obtaining knowledge or other services. It's considered black magic because it breaks the natural boundaries between the worlds of the living and the dead. Drak is suffering from it because his form of necromancy is so radical that it required him to sacrifice a part of himself. But in exchange, he can do everything from simple divination to something impossible like infusing corpses with his essence and using them as rotting meat puppets - i.e., make zombies.

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"How blessed are some people, whose lives have no fears, no dreads, to whom sleep is a blessing that comes nightly, and brings nothing but sweet dreams."

-Bram Stoker