Multiattack

The archmage makes three Arcane Blast attacks. It can replace one attack with a use of Spellcasting.

Arcane Blast

_Melee or Ranged Spell Attack:_ +9 to hit, reach 5 ft. or range 60 ft., one target. _Hit:_ 27 (4d10+5) force damage, and the target must succeed on a DC 17 STR save or be pushed up to 10 feet away from the archmage and knocked prone.

Burst of Magic (Recharge 5-6)

The archmage releases a burst of swirling, multicolored, magical energy on a point it can see within 60 feet of it. Each creature within 20 feet of that point must make a DC 17 DEX save, taking 33 (6d10) force damage and 18 (4d8) acid, cold, fire, lightning, or thunder damage (the archmage's choice) on a failed save, or half as much damage on a successful one.

Spellcasting

The archmage casts one of the following spells, using INT as the spellcasting ability (spell save DC 17).<br>At will: _detect magic_, _disguise self_, _mage hand_, _prestidigitation_<br>3/day each: _charm_, _dispel magic_, _fly_, _invisibility_ (self only), _mirror image_<br>1/day each: _dimension door_, _greater hold_, _wall of force_