Aida

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

Cantrip attack. Aida makes a Firebolt or Frostbolt attack

Firebolt/Frostbolt. Melee or Ranged Attack Roll: +11, reach 5 ft. or range 150 ft. Hit: 27 (4d10 + 5) Fire or Frost damage.

Spellcasting. The archmage casts one of the following spells, using Intelligence as the spellcasting ability (spell save DC 17):

At Will: Detect Magic, Cure Wounds, Identify, Invisibility, Light, Mage Armor (included in AC), Mage Hand, Prestidigitation, Find Familiar (Owl version)
2/Day Each: Fly, Death Ward Fireball (level 7 version)
1/Day Each: True Polymorph, Reality Break, Raise Dead, Teleport

Misty Step (3/Day). Aida casts Misty Step, using the same spellcasting ability as Spellcasting.

Protective Magic (3/Day). Aida casts Counterspell or Shield in response to the spell’s trigger, using the same spellcasting ability as Spellcasting.