1 Dustin: Behold. The Wondrous Foyer and the infamous Valves of Mithril.
2 Dustin: Whatever you do, don’t cut the doors with a sword. They bleed all the blood of the people killed in the Tomb, and we’ll get drowned in blood.
3 Eleven: Why on Earth would anyone attack a door with a sword?
4 Dustin: Frustration at all the other non-obvious means to open things in this dungeon.

I've already talked about the legendary Valves of Mithril, and now finally, here they are. They look a bit unimpressive in the adventure illustration.

But the room that holds the Valves is the Wondrous Foyer! It has six steps leading up to the doors, each made of a different stone. From the bottom: onyx, pink marble, lapis lazuli, black marble, yellow serpentine, and malachite.

Astute adventurers might suspect that the stones and their particular sequencing is some sort of puzzle, to be tackled with many minutes of profound thought.

Astute adventurers would be wrong!