Revenants: Fallen Savior: Revenants book1

An epic undead war rages over the purest and most polluted power ever known - the human spirit. Revenants are all that are undead: ghosts, vampires, zombies and beyond - yet are still human. This undead race can Harness the soul inhabiting and animating them to understand the volumes of knowledge, oceans of power and of swells of emotions a past life contains. Or be slave to it.