Spellcasting. The mage is a 5th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 15, +7 to hit with spell attacks). The mage has the following wizard spells prepared:

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

1st level (4 slots): absorb elements, mage armor, magic missile, shield

2nd level (3 slots): blur, hold person, mirror image, misty step, suggestion

3rd level (2 slots): counterspell, fireball, fly

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

Unerring Acid Bolt. Ranged Spell:  range 50 ft., one target, the target takes 6 (1d4 + 4) acid damage.

Lightning Daggers (Recharge 5-6). Ranged Spell Attack:  +7 to hit, range 50 ft., three targets, the target takes 7 (1d6 + 4) lightning damage.

Thunder Burst (1/Hour). Ranged Spell:  Constitution save, range 50 ft., 15-foot cube, the creatures in the burst take 13 (2d8 + 4) thunder and lightning damage and are incapacitated, repeating the save at the end of their turns. On a successful save they take half damage and are deafened for 1 minute.