Multiattack. The tower sage makes two Arcane Burst attacks and can use Starry Radiance if available.

Arcane Burst. Melee or Ranged Spell Attack: +5 to hit, reach 5 ft. or range 120 ft., one target. Hit: 8 (1d10 + 3) radiant damage.

Starry Radiance (Recharge 5–6). Dazzling light bursts from the tower sage's fingertips in a 15-foot cone. Each creature in that area must succeed on a DC 13 Constitution saving throw or have the blinded condition until the end of the tower sage's next turn.