Crystalline Harp:

Once per session (including during a battle), the wielder may attempt a DC 15 Charisma check to play the Harp. If successful, they may enforce one of the following effects: - A target non-ruler unit loses its next turn. - A nation other than your own gains a level of stability (A nation may only benefit from this once per age) - Increase your level of relations with a non-hostile nation by one (A nation may only benefit from this once per age) - Increase import and export slots by 1