Multiattack. Ervan uses his staff to make three Arcane Blast attacks.

Arcane Blast. Melee or Ranged Spell Attack: +6 to hit, reach 5 ft. or range 120 ft., one target. Hit: 13 (3d6 + 3) force damage.

Acid Rain (Recharges after a Short or Long Rest). Acid falls in a 10-foot-radius, 20-foot-high cylinder centered on a point Ervan can see within 120 feet of himself. Each creature in that area must make a DC 14 Dexterity saving throw, taking 22 (4d10) acid damage on a failed save, or half as much damage on a successful one.