Gigrite, who was sent to the Besfer Ghost Village to solve the Undead problem, said she would need time to find a final solution. She thus asked you to kill the Undead, so this might at least alleviate the harm for the townsfolk. You killed Graveknight Sellswords, Anubite Vigilantes and Pale Zombies in the Ghost Village. Gigrite thanked you upon your return.