Keen Hearing and Smell. The wolf has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Pack Tactics. The wolf has advantage on an attack roll against a creature if at least one of the wolf's allies is within 5 feet of the creature and the ally isn't incapacitated.

Horrifying Visage. Any creature that starts its turn within 30 feet of the Aberrant Dire Wolf and can see it must succeed on a DC 11 Wisdom Saving Throw or be frightened for 1 minute. Affected creatures can repeat this saving throw at the end of each of their turns. A creature who succeeds on this saving throw is immune to this effect for 24 hours.

The Aberrant Dire Wolf can make one bite and one tentacle attack on each of its turns.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone.

Tentacle. Melee Weapon Attack: +5 to hit, reach 10 ft, one target. Hit:  6 (1d6+3) bludgeoning damage. If the target is a creature, it must succeed on a DC 13 Strength Saving throw or be grappled(escape DC 13). Until this grapple ends, the target is restrained. The aberrant dire wolf can only grapple one target. On subsequent turns the aberrant dire wolf can pull a grappled target 5 feet closer.