Multiattack

The devil makes one bite attack and one claws attack.

Bite

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) piercing damage plus 7 (2d6) cold damage.

Claws

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 10 (2d4 + 5) slashing damage plus 7 (2d6) cold damage.

Spear

Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 14 (2d8 + 5) piercing damage plus 10 (3d6) cold damage. If the target is a creature it makes a DC 16 Constitution saving throw becoming slowed for 1 minute on a failure. The target repeats the saving throw at the end of each of its turns ending the effect on a success.

Ice Wall (1/Day)

The devil magically creates a wall of ice on a solid surface it can see within 60 feet. The wall is flat 1 foot thick and can be up to 50 feet long and 15 feet high. The wall lasts for 1 minute or until destroyed. Each 10-foot section has AC 12 30 hit points vulnerability to fire damage and immunity to cold necrotic poison and psychic damage.

If the wall enters a creatures space when it appears, the creature is pushed to one side of the wall (creatures choice)

The creature then makes a DC 16 Dexterity saving throw taking 49 (14d6) cold damage on a successful save or half damage on a success.