Archfey of the Wind and Mind, Wilder

Union Maker. Wilder can cast the Fairie Toast spell as a ritual once per day. 

Legendary Resistance (4/Day). If Wilder fails a saving throw, it can choose to succeed instead.

Magic Resistance. Wilder has Advantage on saving throws against spells and other magical effects.

Curse of the Bound Spirit. When Wilder would drops to 0 Hit Points, He instead drops to 1 Hit Point and teleports back into the ring he is bound to, and the ring becomes dormant for 2d6 days. 

Multiattack. Wilder makes two Psyonic Combat attacks and uses Crackling Wave.

Psyonic Combat. Melee or Ranged Attack Roll: +14, reach 10 ft. or range 60 ft. Hit: 17 (3d6 + 7) Psychic damage.

Crackling Wave. Dexterity Saving Throw: DC 22, each creature in a 60-foot Cone. Failure: 32 (5d12) Lightning damage. Success: Half damage. Failure or Success: The target is cursed until the end of Wilder's next turn. The target can’t take Reactions until the curse ends.

Spellcasting. Wilder casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 22):

At Will: Detect Thoughts, Dimension Door,Dispel Magic, Hypnotic Pattern
2/Day Each: Mass Suggestion, Modify Memory, Plane Shift

Twisted Trickster. Wilder casts Counterspell in response to that spell’s trigger, using the same spellcasting ability as Spellcasting. If the target fails its saving throw, it is cursed until the end of its next turn. Until the curse ends, the target can’t cast spells with a Verbal component, and when it speaks, it says the opposite of what it means.

Legendary Action Uses: 3. Immediately after another creature’s turn, the hag can expend a use to take one of the following actions. The hag regains all expended uses at the start of each of its turns.

Mental Mayhem. Wilder makes one Psyonic Combat attack.

Psyonic Magician. Wilder uses Spellcasting to cast Dimension Door or Hypnotic Pattern. Wilder can’t take this action again until the start of its next turn.