Akor the arch-mage

Magic Resistance. The archmage has advantage on saving throws against spells and other magical effects.

Spellcasting. The archmage is an 19th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 17, +9 to hit with spell attacks). The archmage can cast disguise self and invisibility at will and has the following wizard spells prepared:

Cantrips (at will): fire bolt, light, mage hand, prestidigitation, shocking grasp

1st level (10 slots): detect magic, identify, mage armor*, magic missile

2nd level (9 slots): detect thoughts, mirror image, misty step

3rd level (8 slots): counterspell, fly, lightning bolt,fireball

4th level (7 slots): banishment, fire shield, stoneskin*

5th level (6 slots): cone of cold, scrying, wall of force

6th level (5 slot): globe of invulnerability

7th level (4 slot): teleport,regenerate

8th level (3 slot): mind blank,Antimagic Field,sunburst

9th level (2 slot): power word kill, Meteor Swarm, storm of vengeance,wish

*The archmage casts these spells on itself before combat.

Dagger. Melee or Ranged Weapon Attack: +6 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 4 (1d4 + 2) piercing damage.