The Dodecahedron of Conjuration

Caleb: I have been working on something for all of you, so please. Come in, welcome home. As we walk in, you look up and see that we are standing at the bottom of a tall, almost cylindrical, towering room. All the walls, all nine of them, vast stained glass windows with ornate designs,. These are the nine schools of magic. There is another hole also nine-sided, and you can see through that beyond to more space.