Pyre

The girl who you pick up early on in the story (you probably named her Rhae, Shae etc.) individually needs to deliver 200 Pyre Damage cumulatively (basically, points stack up) in multiple Rites before this pops up. If you reach a Liberation Rite and are planning to free her but this trophy hasn’t popped up, head over to Practice Rite mode (accessed through the Beyonder Crystal in the wagon) and keep playing Rites (with the stowaway selected in your triumvirate) until this pops up.