Multiattack

The winterghast makes two attacks: one with its bite and one with its claw or two with its claws.

Bite

Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 7 (1d8 + 3) piercing damage plus 4 (1d8) cold damage. If the target is a humanoid, it must succeed on a DC 13 Constitution saving throw or contract the creeping cold disease (see the Creeping Cold trait).

Claw

Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 10 (2d6 + 3) slashing damage. If the target is a creature other than an undead, it must succeed on a DC 13 Constitution saving throw or be paralyzed for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.