From publisher blurb:
Clans of the Dark Isle is a new fantasy role playing game campaign setting for your favorite game system. Inside this book you will find a wealth of information detailing the land of Eiledon, a nation on what is known as the Dark Isle. Eiledon, once the domain of elves and gnomes, is now dominated by humans. Despite their numbers, the humans are not free. They are subject to the occupying army of their neighbor, Arthain, and are tormented by horrific monsters from the evil mists. It is time to bring back the tradition of heroes. It is time to unite the clans. It is time to throw off the yolk of Arthish oppression. It is time to name a king or queen for Eiledon.
Some of what you will find inside:
176 pages of information
4 new classes
25 new feats
29 new spells
16 new monsters