Multiattack

The sphinx attacks twice with its claw.

Claw

Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 17 (2d10 + 6) slashing damage.

Dispel Magic (3rd-Level; V, S)

The sphinx scours the magic from one creature object or magical effect within 120 feet that it can see. A spell ends if it was cast with a 3rd-level or lower spell slot. For spells using a 4th-level or higher spell slot the sphinx makes a Wisdom ability check (DC 10 + the spells level) for each one ending the effect on a success.

Flame Strike (5th-Level; V, S)

A column of divine flame fills a 10-foot-radius 40-foot-high cylinder within 60 feet. Creatures in the area make a DC 18 Dexterity saving throw taking 14 (4d6) fire damage and 14 (4d6) radiant damage on a failure or half damage on a success.

Roar (3/Day)

The sphinx unleashes a magical roar. Each time it roars before taking a long rest its roar becomes more powerful. Each creature within 300 feet of the sphinx that can hear it makes a DC 18 Constitution saving throw with the following consequences:

First Roar: A creature that fails the saving throw is frightened for 1 minute

It can repeat the saving throw at the end of each of its turns ending the effect on itself on a success.

Second Roar: A creature that fails the saving throw takes 22 (4d10) thunder damage and is frightened for 1 minute

On a success the creature takes half damage. While frightened by this roar the creature is paralyzed. It can repeat the saving throw at the end of each of its turns ending the effect on itself on a success.

Third Roar: A creature that fails the saving throw takes 44 (8d10) thunder damage and is knocked prone

On a success the creature takes half damage.