Necromancers

From Introduction:

Necromancers are those who have looked into the Nether regions of the universe and seen a power both great and terrible. The corrupting power of Darkness seeks to replace all Life with its own energies, and anyone willing to give up their own life force to the Darkness can expect to be granted impressive might. Darkness is the force that animates the dead and turns the living into walking mockeries of what we call life, but it does provide a kind of immortality to its most ardent supporters. Necromancers are the most active servants of this shadowy power, seeking to manipulate Darkness to their own ends...and the ends of That Which Corrupts All.