The Devachanic Plane: Its Characteristics and Inhabitants

Leadbeaters treatment of Devachan is an expansive look at an interesting mystic concept taken from Theosophy and interpreted with slight variance in other systems. The basic premise is that of a temporary situation between physical incarnations, which is vaguely similar to the concept of a Christian heaven although heavily subjugated to a many-layered sort of ascension away from the physical and mortal and into a sort of merging with spiritual forces adopted from Eastern systems such as Buddhism and Hinduism. The list of entities in the various rupa and arupa regions is quite elaborate.

In some texts- although not this one- Devachan is also described as quasi-purgatorial.