From publisher blurb:
What Happens to a Soul in Those 10 Days Before Raise Dead Fails?
The answers are here: a soul ascends Purgatorus to enter Celestia or fall to Infernus. Drawing on Asian and Western mythology, including Dante's Divine Commedia (including Inferno, Paradiso, and Purgatorio) and the Dictionnaire Infernal, a host of evil-aligned damned, good blessed, and neutral pilgrims await adventurers who dare to visit the Nine Circles of Infernus, the Seven Tiers of Purgatorus, or the Five Spheres of Celestia.
Inside, you'll find 112 new monsters for 5E games, ranging from celestians to infernals to purgatorans. In Celestia dwell ten different types of celestians and nine hierarchies of malakhim (types of angels), led by the four seraphs. In Infernus are tortured a dizzying variety of undead damned who are fielded in battle by the eight Infernal Dukes. They in turn are led by the Innominatam, The Nameless One himself, insensate at the bottom of Infernus but far from helpless. Each Duke has many infernal minions at their disposal, ordered by the sin they punish. And in-between Celestia and Infernus are the purgatorans, lost souls trying to find their way to their eternal reward. Ferocious guardians ensure they are not easily misled from their path, including giants, gryphons, and hydras.
This PDF has a bookmarked table of contents, with monsters linked by challenge rating and plane. Challenge ratings range from 0 to 30.