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.ms,rs 5 to hit, reach 5 ft. or range 60 ft., one target. ({@damage 3d8) radiant damage.
+1 Quarterstaff.mw 4 to hit, reach 5 ft., one target. ({@damage 1d6 + 3) bludgeoning damage, or 7 (1d8 + 3) bludgeoning damage when used with two hands.
Radiant Fire 5.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 13 Dexterity saving throw, taking 28 (8d6) radiant damage on a failed save, or half as much damage on a successful one.