I have a lot of experience playing Fey Wanderers in 2014 and I am playing my first in 2024. I think I found an exploit in the new rules with the Friends spell. The PC has Magic Initiate (Wizard), so I can get Friends at level up.
Here is the wording for Friends and Beguiling Twist. Note the underlined:
Friends:
"You magically emanate a sense of friendship toward one creature you can see within range. The target must succeed on a Wisdom saving throw or have the Charmed condition for the duration. The target succeeds automatically if it isn’t a Humanoid, if you’re fighting it, or if you have cast this spell on it within the past 24 hours."
Beguiling Twist (relevant part):
In addition, whenever you or a creature you can see within 120 feet of you succeeds on a saving throw to avoid or end the Charmed or Frightened condition, you can take a Reaction to force a different creature you can see within 120 feet of yourself to make a Wisdom save against your spell save DC. On a failed save, the target is Charmed or Frightened (your choice) for 1 minute. The target repeats the save at the end of each of its turns, ending the effect on itself on a success.
The wording on Friends makes it an automatic successful save instead of being immune to the spell if used in combat. The way I read this is I can spam Friends resource free in combat and it automatically triggers a successful save and therefore beguiling twist on another enemy, which is essentially like a concentration-free Cause Fear.