Alexius was a Watcher, an elemental being immune to time that can take the form of a hawk, before he chose self exile, meaning mortality and the abandonment of his powers to live in the mortal world, to "be with" Lucia Damora, with whom he claimed to have fallen in love. This was, in fact, true, but the real reason he chose exile was because he has been bound to the Elder Watcher Melenia and she forced him to leave the Sanctuary to assist Lucia in locating the Kindred and, after they had been found, dispose of her. Alexius, however, unable to break free of Melenia's enchantment, took his own life to save Lucia's. It is later revealed, in Frozen Tides, that, before his death, he fathered Lucia's only child, her daughter Lyssa.