Novae Terrae, the trilogy

At the beginning of time, the birth of Luisu Sazanus, a being descended from the first Vampire in history, was about to bring the whole world into chaos. This threat had been solved by his mother, human but also one of the most powerful Witches that the Earth has borne, who created an artefact in which she concealed the most important of all powers, in order to prevent her offspring from using it against all of humanity. She also founded the Order of the Eternals to ensure the safety of this coveted object. They decided to entrust its protection to one, single being, a Hunter, who would also be responsible for fighting against the descendants of Luisu, determined to achieve the latter's goals. But the shadow of another threat hangs in the air, made flesh by Eleonore, a creature who is not the kind to give up easily...