Listen to Unbreakable Chains: Vanitas Final Battle Theme online. Unbreakable Chains: Vanitas Final Battle Theme is an English language song and is sung by Patrem. Unbreakable Chains: Vanitas Final Battle Theme, from the album Reminiscence of Kingdom Hearts, was released in the year 2016. The duration of the song is 4:27. Download English songs online from JioSaavn.