When your in the Noxious Glade, you'll occasionally see a pair of these npc's wandering around the outskirts.
At random intervals one will say:
"Ghoul! Come here for a moment!"
A nearby ghoul will run over and pause in front of the npc and he will give it a little "Treat".
"Here, eat this, our enemies shall be delighted."
Followed by the emote "Acherus Necromancer Places a Stick of Dynamite on the ground."
Naturally the ghoul eats it as ordered.
The second Npc will in turn say: "You are such a Devious one! Whatever shall we do with you?"
The First: "Why thank you. I do pride myself on knowing when a little bit of grease beats spending hours of sorcerous study for the same effect."