Black Sun Dawn

From publisher blurb:

The Cabal of the Black Sun stands as one of the more recent examples of a concerted effort to forestall death. A society made up of deranged wizards and other users of magic, they plunged headlong into darkness after recovering the fabled Black Sun Manuscript, an ancient tome brimming with evil. Using the writings as the basis for their study, they conducted unspeakable experiments, spawning horrors beyond imagining as they sought to find the key to immortality. Black Sun Dawn reveals this dreaded society, exposing their mad designs and the deranged products of their wicked labors. With this installment of Legacy of Shadow, you can introduce a new threat, one that would reshape the world into its own vile image.