While half of the party makes preparations for the upcoming siege. The other takes the task of restoring some of the magical protections outside. There is a brief but brutal encounter with a small party of hobgoblins and their sick slaves. The party manages to kill or drive off the attackers and disable or accidentally kill the confused commoner slaves. They return quickly to the keep with the slaves and the keeps healer determines that they have been fed an alchemical concoction that is slowly converting them into a living but necrotic state.