Am I reading the same thing? Because Necrotic Shroud is a Celestial Revelation
Celestial Revelation
When you reach character level 3, you can transform as a Bonus Action using one of the options below (choose the option each time you transform). The transformation lasts for 1 minute or until you end it (no action required)
...
Necrotic Shroud. Your eyes briefly become pools of darkness, and flightless wings sprout from your back temporarily. Creatures other than your allies within 10 feet of you must succeed on a Charisma saving throw (DC 8 plus your Charisma modifier and Proficiency Bonus) or have the
Frightened condition until the end of your next turn.
I don't see why this wouldn't apply for the full 1 minute duration. What am I missing? Wouldn't creatures other than your allies have to repeat the save every round they're within 10 feet?