Morrigan's Cross

the long version

In 12th-century Ireland, sorcerer Hoyt Mac Cionaoith does battle with a centuries-old vampire named Lilith, who has turned Hoyt's twin brother, Cian, into a fellow bloodsucker. Unable to defeat her, Hoyt is visited by the goddess of battle, Morrigan, who charges him with the task of leading a battle, "the greatest ever waged," against Lilith and her demons. Hoyt must gather five others to fight alongside him: "the witch, the warrior, the scholar, the one of many forms, and the one you've lost."