Multiattack. Mercion makes one Divine Radiance attack and one +1 Quarterstaff attack. She can replace one of these attacks with a use of Spellcasting.

Divine Radiance. Melee or Ranged Spell Attack: +5 to hit, reach 5 ft. or range 60 ft., one target. Hit: 13 (3d8) radiant damage.

+1 Quarterstaff. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) bludgeoning damage, or 7 (1d8 + 3) bludgeoning damage when used with two hands.

Radiant Fire (Recharge 5–6). Mercion creates a magical explosion of fiery radiance centered on a point she can see within 120 feet of her. Each creature in a 20-foot-radius sphere centered on that point must make a DC 13 Dexterity saving throw, taking 28 (8d6) radiant damage on a failed save, or half as much damage on a successful one.