Quote Originally Posted by Domille View Post
You require a specific key item to do so. or progress in rhapsodies.

Square is never clear on what players need to do.
You sure about that? Looking at wiki, "Rhapsody in Umber" only unlocks the Lv75 Genkai battles for Alter Egos.

@OP: Did you just form a party? You gotta wait 2 minutes after forming a party before calling trusts.

That said, if you're Lv30+ especially with Dancer sub... the silly dragon is a pushover anyways.