Armor Class 17 (natural armor)
Hit Points 199 (19d10 + 95)
Speed 40 ft., fly 60 ft.
Saving Throws DEX +6, CON +11, INT +9, WIS +10
Skills Arcana +9, Perception +10, Religion +15
Damage Immunities psychic, [object Object]
Condition Immunities charmed, frightened
Senses truesight 120 ft., passive Perception 20
Languages Common, Sphinx
Challenge 17
Inscrutable. The sphinx is immune to any effect that would sense its emotions or read its thoughts, as well as any divination spell that it refuses. Wisdom (Insight) checks made to ascertain the sphinx's intentions or sincerity have disadvantage.
Magic Weapons. The sphinx's weapon attacks are magical.
Multiattack. The sphinx makes two claw attacks.
Claw. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 17 (2d10 + 6) slashing damage.
Roar (3/Day). The sphinx emits a magical roar. Each time it roars before finishing a long rest, the roar is louder and the effect is different, as detailed below. Each creature within 500 feet of the sphinx and able to hear the roar must make a saving throw.
Claw Attack. The sphinx makes one claw attack.
Teleport (Costs 2 Actions). The sphinx magically teleports, along with any equipment it is wearing or carrying, up to 120 feet to an unoccupied space it can see.
Cast a Spell (Costs 3 Actions). The sphinx casts a spell from its list of prepared spells, using a spell slot as normal.
Monster Manual (2014), p. 281