At this point in her timeline, Spin's universe (a micro-universe called Continuum) is dead, so now she must survive in the universe beyond - our universe. This form and the planet she currently occupies are Pokemon themed because that is what I am currently into (character creation-wise, and specifically on PokeFarm). It's the same planet where Scarab and Ankh live.

This universe is full of gods and other powerful beings, creatures that are far greater than Continuum's little guardians. Spin's fellow guardians were out to punish her for pretty much causing the destruction of Continuum. That, along with the general threat from this universe's own guardians, who do not approve of micro-universes spilling out into theirs, meant that Spin required a greater ally. She sought out one she had encountered in the past, known as the Spirit of Time, and agreed to serve it in exchange for her protection. This same being had forced her into becoming a Grim Spirit in the past, now she acts as one willingly. Grim Spirits are a reaper species designed by the Spirit of Time. They harvest souls from mortals and pass them on to their master.