From Final Fantasy XIV A Realm Reborn Wiki
Akh Morn is an action unlocked at level 70. It's available for Summoner.“
Deals unaspected damage to a target and all enemies nearby it with a potency of 650 for the first enemy, and 50% less for all remaining enemies.
- Can only be executed while Demi-Bahamut is summoned.
- ※This action cannot be assigned to a hotbar.
— In-game description