From publisher blurb:
Evil clerics... leaders of forgotten, dangerous cults of monstrous, cruel gods... Cool NPCs?
Powerful PCs? YES!
In the wicked pages of this book you'll find fifteen new powers, hints and class features that can be used for building your evil cleric, a faithful cultist of Nhudhekw, the Ravenous Wolf, the new evil god described in this supplement.
What? You want to use them for your already-existing cult leader or dark templar?
The powers and class features of this book can be used with any evil-aligned cleric.
And yes... also included a free set of power-cards for quick reference during play!