The Universe refers to the Universe that the Vast Expanse itself resides in. Those who have Transcended in the Vast Expanse have went out into the Universe.
The Universe is so big that even Half-step Ancestors can't see its borders — it's truly infinite filled with endless sea of stars, with countless vortexes and other heavenly bodies. The Vast Expanse Realm is just a single whirlpool of star within this boundless Universe.
Out in the Universe, everything is quiet, there are countless other whirlpools of stars, and it is very possible to imagine that they are full of their own various worlds.
Stepping into the UniverseEdit
For someone to enter the Universe they have to truly step into Transcendence and rip open a hole in the barrier outside the Vast Expanse and enter it.