As an action, you roar, rear up, flex your wings, or do another similar movement that frightens creatures. Each creature of your choice in a sphere around you must succeed on a Will saving throw or become frightened of you for the duration. A construct or an undead is immune to this effect.
While frightened by this maneuver, a creature must move at least half its speed away from you by the safest available route on each of its turns, unless there is nowhere to move. If the creature ends its turn in a location where it doesn’t have line of sight to you, the creature can make a Will saving throw.
On a successful save, the effect ends for that creature.
If a creature’s saving throw is successful or the effect ends for it, the creature is immune to your Fearsome Beast for the next 24 hours.