It is a thin disk made of entirely biological material, usually wood, and it has high vulnerability to fire. The disk's purpose is to magically contain a tree within it's own pocket dimension, which is only big enough to support and keep the tree in as good of condition as the disk itself. The disk takes on the appearance of the tree's trunk. It constantly weighs 2 lb, even when containing a tree. When placed on any type of soil, it transforms into the tree it contains, the owner of the disk is the only one who can revert it back into it's compact form.

Notes: Vulnerability: Fire