Soul Realm, hazy and indistinct.
Unknown was a freshly born high-level soul entity. It might have once been a person, a dog, a weeping willow by the river, or a grotesque sandstone formation.
After its destruction, it dispersed into a mist and entered the Soul Realm, where it was tempered over countless years, eventually growing into a member at the top of the food chain.
Its previous consciousness had long been erased, and a nascent consciousness swirled in its brain. It was like a child with normal intelligence but dazed and confused, needing time to shape its various concepts.
It had no name, oh wait, now it did—it would be called Unknown.
That day, it was squatting at the crack, when it suddenly felt the fluctuation of some being. The other had communicated with it for a long time and bestowed upon it that name.