Survive the Judgement.

The soul separates from the body once it dies.

Soul with no vessel will be guided to the afterlife.

Guided towards the light you will reach heaven.
Guided towards the dark you will reach hell.
fall short and your destination will be the purgatory also known as the judgement world by the souls who lived there.

The judgement of that world will be the one that will guide you to either heaven or hell.

Why and how souls are judge is still a mystery to this very day.
....

Tan Walker was one of the souls that fall short, having no memory of the life he once lived and not accepting that he already died.

The desert city home to the guardians and bohera.
He venture the city that he now lived in finding clues and possibilities of returning back to
Earth, his home.