The words issuing from you belong to no mortal tongue, and they carry the weight of Bahamut's own voice.

Daily   ✦     Divine
Minor Action      Personal

Effect: Until the end of the encounter, you can speak Supernal as if you were a god or angel, such that any creature that has a language can understand your speech. In addition, you gain a +5 bonus to Diplomacy checks and Intimidate checks while speaking Supernal through this power.

Published in Player's Handbook Races: Dragonborn, page(s) 15.