Before the Reverberation Disappears - S1.E20

After losing Alicetaria and Selesia, Meteora and the others try to trap Altair within the Bird Cage, but the audience sympathizes with Altair and transforms the Bird Cage into a stage for amplifying Altair's powers! Meteora tries to turn the tables on her by bringing out their secret weapon: Sirius, a Creation with the same appearance and the same powers as Altair!