Moon Blood - The First Blood Son, #5

They were unique among their kind. Ancients were the first-born of the originals. They didn't seek out destruction or evil. It sought them, challenged them, and tried to possess them. Kane de Medici is the powerful first blood son of Brogio, the original vampire. Devoted to learning, he has chosen a life of knowledge and experimentation. After centuries of war and battle, he longs for peace and fulfillment with those he loves.
Moon, Kane's hybrid wolf progeny, is loyal to him above all, while Enzo, her magical spirt wolf, is devoted to her protection. Zandra Moretti is the first born of King Lycan, the original werewolf. She and her ten brothers are hybrid vampire Lycans committed to not harming innocents and to fighting for what is right. Kane is the love of Zandra's existence, and with him, she and her brothers will give their lives to fight against the evil that endlessly seeks to capture or destroy him.
Anointed as God's chosen warriors, they are pitted against Satan and all manner of evil from their past.  Giving their all to protect each other and humanity, the de Medici vampires must face the ultimate test of their strength, skills, and intelligence. Underneath it all, love and loyalty are the keys to victory with Moon and Enzo showing them the way. The ultimate clash of Good against Evil plays out in Moon Blood Book 5, the culmination of the First Blood Son Series.