As I already explained, he is a Priest in the broad sense of the concept, but if he were to have a “class” it is not the same as the player-version of said class.
- Likewise, Sylvanas may in part be a “dark ranger,” but she is not the same Hunter-Dark Ranger that players use. Turalyon may be a Paladin, but it is not the same as the player class.
NPCs are not constrained by player classes. The are functionally and fundamentally distinct.