Take a look at the map when you are in the Nexus -
the portals on one side and a single remainging area
left on the opposite side.
Logic would imply that using the keys or completing
konquest would allow one to access this realm of 1.
- Thoery comes from Dragon Kings speach when
he tells Shujinkos that he needed to find all Komidojo
to unite the Realms and the Gods or whatever....
Cheers.