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): Detect Magic, Identify, Mage Armor,* Magic Missile
• 2nd level (3 slots): Detect Thoughts, Mirror Image, Misty Step
• 3rd level (3 slots): Counterspell, Fly, Lightning Bolt
• 4th level (3 slots): Banishment, Fire Shield, Stoneskin*
• 5th level (3 slots): Cone of Cold, Scrying, Wall of Force
• 6th level (1 slot): Globe of Invulnerability
• 7th level (1 slot): Teleport
• 8th level (1 slot): Mind Blank*
• 9th level (1 slot): Time Stop

*The archmage casts these spells on itself before combat.