Irene and Tamerlano sing of the happy life that awaits them, after Tamerlano has had his revenge. Leone then reports the arrival of Asteria and Bajazet. Bajazet is surprisingly serene now, but finally reveals that this is because he has taken poison. As he becomes more incoherent, he says goodbye to his daughter and berates Tamerlano, until Andronico and Asteria carry him out of the room. Asteria then returns to ask for death, since Tamerlano can never get what he wants from her. Both Irene and Andronico send after Asteria to try and stop her suicide, while Tamerlano is finally changed by the events he has witnessed as well as by Irene's pleas. He finally pardons Asteria, Andronico, and Bajazet. The opera concludes with a love duet between Tamerlano and Irene, and the chorus sings of love's ability to save light from the dark.