Bite

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage.

Gore

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) piercing damage.

Keening (Recharge 6)

The wolpertinger emits a piercing shriek. Each creature within 30 feet that can hear the wolpertinger must succeed on a DC 13 Constitution saving throw or be deafened for 1 minute. A beast with an Intelligence of 4 or lower that is in the area must also succeed on a DC 13 Wisdom saving throw or be frightened until the beginning of its next turn.