From the publisher:
An insane goddess above. A demonic god below. Caught in the middle, a civilization on the verge of civil war. Welcome to NEIYAR: LAND OF HEAVEN AND THE ABYSS, an original campaign setting for the d20 system.
The world of Neiyar is set on an isolated jungle island surrounded by fierce seas and guarded by an ancient beast that destroys any ships that get too close. The civilization has developed in a vacuum, as centuries of isolation from the outside world allowed the residents of the island to create their own, unique social structure.
But the Code of the Neiyar, for so long the only law ever needed, is crumbling. Influences from Outsiders (people not native to the island, but arrived via shipwrecks or other means) are leading people to question the rule of the Devi. An old foe, the mighty Krakadons, seeks to reclaim its lost empire and threatens to once again war against the Neiyar. And the demon-god Nephar plots to once more unleash his demonic armies against the struggling culture.
Neiyar features five new playable races, two player race templates, 10 new prestige classes, as well as tons of new spells, feats, monsters, magic items, and more. Learn Hearth Magic and defy the laws of both arcane and divine spellcasting. Take "flaws" to round out your character...and earn bonus feats. This complete campaign setting includes a full module.