Yggdrasil

Borders: Sigil, Mainland, the other realms.

Location: Growing through Ysgard and reaching the realms above and below it.

The Airship Mystic links the Mainland side of the Great Divide to a place near the base of this 'Dreadful Oak', whose vastness cannot be defined. It is small enough to be recognisable as a tree to mortal eyes, large enough to extend through and link the worlds of which Ysgard is one, and is simultaneously both sizes at once. Portals and gateways from the platforms that encircle the tree lead to the other worlds and one leads to the City of Doors, Sigil, from where worlds Yggdrasil doesn't touch might be reached.