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.

Aberrant Knowledge:  can read, speak and understand abyssal, common, deep speech, primordial, and celestial

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: 1d8 bludgeoning damage and can grapple an enemy on a nat 20

Eldritch breath: can fire an eldritch breath attack dealing 1d10 psychic damage

Claw: 1d4 slashing damage

Multiattack: can attack 2 times per turn (either a claw and bite or a breath and bite)