DnD Magic Item - Cubic Gate

Wanted to make a new DnD item. This one is about 2.5" in all of the dimensions. So here is the Cubic Gate!

I have 3 forms of it. One is a completely solid, another is hollowed out to about half an inch thickness, and the third is scaled down to about 24 mm for dice if anyone has that interest. Please let me know if there is anything I can do to change things up.

*Photo taken from DnD beyond page