Imagine your characters walking into a large chamber dominated by this thing.
The top is simply a 10mm wizard courtesy the fine folks over at Irregular Miniatures. The base is part of a Kid's Meal toy that's been bopping around the bits box for years. I always knew it would come in handy for something.
What I love about features like this is that you can stash the code to unlock the door somewhere else in the dungeon, and that treasure map unlocks the secret to this tomb.