Archmage Necromancer

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

Spellcasting. The archmage is an 18th-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 (4 slots): Cause Fear, identify, mage armor*, Ray of Sickness

2nd level (3 slots): Ray of Enfeeblement, mirror image, misty step

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

4th level (3 slots): blight, fire shield, stoneskin*

5th level (3 slots): cone of cold, Danse Macabre, Negative Energy Flood

6th level (1 slot): globe of invulnerability

7th level (1 slot): Finger of Death

8th level (1 slot): Clone*

9th level (1 slot): time stop

*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.