Multiattack

The uridimmu makes three attacks: one with its bite and two with its mace.

Bite

Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 19 (3d8 + 6) piercing damage.

Mace

Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) bludgeoning damage plus 18 (4d8) fire, lightning, or radiant damage.

Heavenly Roar (Recharge 5-6)

The uridimmu can unleash a powerful roar imbued with divine power in a 30-foot cone. A target caught within this cone must make a DC 18 Constitution saving throw, taking 45 (10d8) thunder damage on a failed save, or half as much damage on a successful one. If the saving throw fails by 5 or more, the target is also frightened for 1 minute. A frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. Fiends have disadvantage on this saving throw.