He is one of the reanimated scholars that collaborated with the Ancestor, murdered and then brought back with much of his intellect intact, but with little to no humanity remaining. The Necromancer is an Unholy/ Eldritch boss that appears in the Ruins. Freed from the trappings of their humanity, they plied their terrible trade anew: the dead reviving the dead, on and on, down the years. I brought my colleagues back with much of their intellect intact - a remarkable triumph for even the most experienced necromancer.

Having learned all I could from my visiting guests, I murdered them as they slept. I entertained a delegation of experts from overseas, eager to plumb the depths of their knowledge and share with them certain techniques and alchemical processes I had found to yield wondrous and terrifying results. Who could have divined the prophetic import of something as unremarkable. I began in humility, but my ambition was limitless. Mastery over life and death was chief among my early pursuits.

Darkest dungeon killing the necromancer