I think you find it in crows wood somewhere on a note.
More likely, none.
Mortality is far more relative when talking about elves and magic. Someone living a few hundred years (or into the thousands) doesnt simply mean they are immortal
Well immortal doesn't mean invincible. The issue is that we cant know an entity is immortal because it requires information we dont have.
Like the Tribunal. They could technically be immortal, but they died so we can never find out.
Entities currently living, that have lived a longtime, are virtually immortal but without knowing they actually are or not