Fae have their own plain
They separated before Aire became a problem.
When Aire did come about, Saevel had just been born and Filnar had just been "killed." Analia, fearful of losing another child, mayhaps, just a little, altered Saevel's fate-- pushing him to Filnar's domain.
Not great but not horrible.
Creation of Feywild
Open privacy settings
Creation of a New Plane