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:

*The archmage casts these spells on itself before combat.

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

Variant: Familiars. Any spellcaster that can cast the find familiar spell (such as an archmage or mage) is likely to have a familiar. The familiar can be one of the creatures described in the spell or some other Tiny monster, such as a crawling claw, imp, pseudodragon, or quasit.