One of many doors in the Second World. These doors lead to other worlds.

The Second World, also known as the In-Between World, is made from an infinite number of universes that coexist through time and space. An infinity of universes in an infinity of dimensions. Asgard, Midgard and Niflhel are examples of these universes. The Second World contains many passages or doors, providing access to all these universes. However there are only certain passages to which one can find the keys. A being known as the Guardian of the Keys controls these passages and opholds The Law of the Worlds.[1]