For the specific starter, I propose that they have to smuggle the dead-but-possessed king out of the castle by passing him through the building in a series of pairs/small groups in various hastily-assembled disguises and excuses for muffled noises of spirit complaints.

For instance, put into one of the dead Mortalitasi's outfits and Weekend at Bernie's-ed down the stairs and then stuffed in a wardrobe and carried to a storeroom where he's transferred to a rug that's being moved and thence lowered from a window down a story to avoid a crowd outside the door and then... you get the idea, whatever other semi-ridiculous disguise ideas people may have and finally out of the city altogether.