It is only after the Breaking was resolved by the clans did Lucas change his name to Lucius Frowsley. Lucius is at least 1000 years old, and lives in a rundown hut on Old Woman Creek.
He dies finally in the fourth book as a final favour from Alger and indirectly, Alister who grants him death. Alger was at first not eager to do so because, as he had found out, Lucas was the one who betrayed him to the Bayars and therefore, the trigger to the chain of events that ultimately led to the tragic love story of Hanalea and Alger or what most people perceive to be the Breaking which was the cause of the creation of the story of the Demon King. He tells Lucas "I think you need another thousand years to think about it" and asks what, exactly he owes him now after he completely ruined his life. But Han persuades him to take pity on him in the end, pointing out that "they only win if they change you" and "it's not about what they think it's about who you are" because, as both Han and Lucas know, Alger is compassionate at heart.