Clan Lasombra Trilogy 2: Shadows

Summary
In Chains of Night and Blood

The Vampire Lucita is a prisoner to the fanatical monsters of the Sabbat, who are forcing her to hunt for a hidden enemy and powerful shadow-caster. Every night in captivity further erodes her soul and enslaves her to the sect born of the murder of the tyrannical progenitor of Clan Lasombra.

But soon enough, these concerns fade before the mounting evidence that the enemy they all face is no mad ritualist or lone elder. The shadows whisper words of doom: if this is the final night, it will last forever.

Lasombra returns.

Terminology
Conspiracy of Isaac, Sargon Fragment