The Sanctuary

The Sanctuary is a "safe haven" for souls who have passed and were carried away by Light Angels or Angels of Life. This wonderful imagination-powered world is separated from the divine's realm through a thick marble rolling gate, leading to a portal glistening with whatever an individual dreams. 
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** SPOILERS **
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Believed to be a grand heaven, it is revealed by the Dovena dragons to Queen Laythia and later to Princess Alyssia from Drac Jadis that The Sanctuary and Hell both are actually just soul-generators to help give additional power to the gods that control them. Vitality gets extra strength from every spirit that dwells within The Sanctuary, living out eternity in their imaginary realm with loved ones who also dwell within The Sanctuary. 
Many souls choose to take an oath to serve Vitality as an Angel of Light - this gives them an opportunity to have a second chance at "living" below and being able to influence what can happen.
~ Twilight is first mentioned in The Deity Jewels and explained as the black, white, and gray realm in between life and death. 
~ The Spirit Realm is a typically peaceful dimension beyond the others, and is much harder to reach and evolve to for many souls. 
Drac Jadis and a few other dragons explain their beliefs that the eternal gods purposefully manipulate cosmic energy to trap souls in this universe to continue to add to their own mini-divine-battery-universes. The Abyss and The Sanctuary are the main known "essence-generators" (as Florafilia calls them in Divine Killer) but there are other deities in the process of manipulating their own.
For many ages, the gods used bloodlines to generate extra influence and power. 
However, with a few constantly making moves to gain more, many of the others feel pressured to do the same to prepare for a potential Divine War.