Criosphinx

Large Monstrosity, Neutral

AC: 18

Initiative: +2 (12)

HP: 228 (24d10 + 96)

Speed: 30 ft., fly 60 ft.

STR: 18 (+4)
DEX: 15 (+2)
CON: 18 (+4)
INT: 16 (+3)
WIS: 16 (+3)
CHA: 16 (+3)

Skills: Arcana +8, History +8, Perception +8, Religion +8

Resistances: bludgeoning, piercing, slashing from nonmagical attacks

Immunities: psychic

Condition Immunities: charmed; frightened

Senses: truesight 120 ft., Passive Perception 18

Languages: understands Common, Sphinx

CR: 13 (XP 10,000; PB +5)

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.

Actions

Multiattack.

The sphinx makes a ram attack and two claw attacks.

Ram.

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 17 (3d8 + 4) bludgeoning damage.

Claw.

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.

Legendary Actions

Legendary Action Uses: 3. Immediately after another creature’s turn, this creature can expend a use to take one of the following actions; it regains all expended uses at the start of each of its turns.

Ram Attack.

The sphinx makes one ram 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.

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Source: Plane Shift: Amonkhet, p. 32 - Licenses and attribution