Assume Bob the Brave is immune to the frightened condition.
He is faced with a ghost, that attempts to use Horrifying Visage against him.
Does his immunity prevent him from rolling the save, failing by 5 or more, and gaining white hair?
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8
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Bob ages.
The aging effect is separate from the fear effect.
If the save fails by 5 or more, the target also ages 1d4 × 10 years. [...] If a target's saving throw is successful or the effect ends for it, the target is immune to this ghost's Horrifying Visage for the next 24 hours. The aging effect can be reversed with a greater restoration spell, but only within 24 hours of it occurring.
Bob rolls the save. Regardless if he fails or not, he is not frightened. Other creatures would lose the fear effect by eventually rolling a successful save.
If Bob failed the save by 5 or more, he has 24h to use a Greater Restoration on himself. Regardless of his bravery.
