Gnome tosses rotten necromancer head to NPC
NPC: What the FUCK!?
Gnome: Jobs done. wheres our payment
NPC: I just asked you to look into if he was behind the kidnappings, not to kill him!
Gnome: well one way or the other, the kidnappings wont happen anymore
We ended up killing the npc too and used the necromancers own notes and magic to bind both their souls to one single body under our thrall