Luminite Brick

On its own it is a plain endgame brick that sells for nothing, but it is the doorway to the eight colored lunar bricks. Every one of them, from heavenforge through cosmic ember, comes from putting this into shimmer and taking whichever variant comes back. If a post-Moon Lord build needs a specific palette, this is the block to mass produce first and sort out later.

• The seam pattern lines up with Martian Conduit Plating, so the two can share a wall without an obvious break between them.
• It makes its own matching wall, which is what you want behind anything built out of it.