Epic Dungeon in the Playground
The Deadly Dance
You see a large ballroom ahead of you. Inside, there are at least 20 dancing nobles, but their eyes are glazed over in white, and they seem… wrong some how. To happy maybe? The fire is crackling merrily, the is music coming from the walls, and chandeliers light up the room. A man in a suit a comes over, with a smile on his face, and says: “Would you like to join? We have plenty of food and drink for you, and plenty of single ladies. Come on in and join the party!”
The room is 40×50
In reality, the nobles are mindless constructs (so mindless, that all they can do, ever, is continue dancing), and the usher is a illusion. They were made by a powerful lizardfolk wizard (Maybe a lich later in the castle?) to protect an ancient crystal he imbued into a chandelier to hide it. The chandeliers have been animated by the crystal, and prey on people distracted by the fake nobles, who are easy targets. When victims enter, the chandeliers silently float down from above, and try to sneakily suffocate the members at the back of the party. When in danger, the large one bearing the crystal can fly back to the ceiling for safety, but the rest have to slowly float back up, taking an hour or so. The constructs also act as moving terrain, knocking people out of the way or just getting in the way. Ghouls or the like sometimes come and eat the dead, so that might be used to make it a little harder.