The Mad Mage of Mount Baratok

The Mad Mage has advantage on saving throws against spells and other magical effects.

The mad mage is an 18th-level spellcaster. His spellcasting ability is Intelligence (spell save DC 17, +9 to hit with spell attacks). He can cast disguise self and invisibility at will and has the following wizard spells prepared:

At will: disguise self, invisibility

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

Level 1 (4 slots): detect magic, mage armor, magic missile, shield

Level 2 (3 slots): mirror image, misty step, web

Level 3 (3 slots): counterspell, fly, lightning bolt

Level 4 (3 slots): Mordenkainen's faithful hound, polymorph, stoneskin

Level 5 (3 slots): Bigby's hand, cone of cold, scrying

Level 6 (1 slots): true seeing

Level 7 (1 slots): Mordenkainen's magnificent mansion

Level 8 (1 slots): mind blank

Level 9 (1 slots): time stop

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