Realm between realms

The Realm between realms is an extra-dimensional plane of existence located outside of the bounds of reality itself. Within the realm, conventional laws of physics and time do not apply, and beings that make their way to this plane will find that they do not age or experience any sensation at all. 
The Realm between realms is said to have always existed, and serves as 'the beating heart of the multiverse'. Within the Realm between realms, the so-called, "Universal Constant" is located. The Universal Constant, which, like the realm can take on many different appearances, most often appears as a large tree. Attached to the tree, are countless "petals", each of which are a single Universe anchored to the tree. The Universal Constant serves as the anchor by which all universes are linked; this anchor ensures that all universes operate on the same timeline, despite their numerous differences. 
The realm itself is devoid of anything, aside from a central location where the tree is and several floating masses. The only other object within the Realm between realms is a large, other-worldly object, called "The Gate" which serves an unknown purpose.