[!Spoilers!]
Just a warning, but if your affection levels for Feliar and/or Vicoria aren't high enough when standing against Mirage, then one or both of them will perma-die respectively.
After the recent events, out of the curiosity I visited Feliar´s house and... ouch. Feels bad man...
How much affection would that be per say?
Not sure. I suspect above 60.