You lose it...The Borgia raid the Villa, kill Mario, and *SPOILER* have a turncoat working in the Brotherhood. The Armor of Altaïr was an unbreakable set of armor that was constructed by Altaïr Ibn-La'Ahad using knowledge obtained from the Apple of Eden. Subsequent to his death, the armor was sealed in the Sanctuary beneath the Villa Auditore, where it was later recovered and used by another member of the Assassin Order, Ezio Auditore da Firenze.