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 attack rolls 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.   Abyssal Potential These monsters, when summoned as an ally of the summoner and not in a subjugation ritual, their hitdie will increase by an amount equal to Caster Level, and their damage die will increase by an amount equal to the amount of Ability Score Improvements they've had.