Keen Senses: Wraith's Companion has advantage on WIS (perception) checks relying on Hearing and Smell.

Pack Tactics: Wraith's Companion has advantage on attack rolls against a creature of at least one of it's allies is within 5ft of the creature and the ally is not incapacitated.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 7 (2d4 + 2) piercing damage. If the target is a creature, it must succeed on a DC 12 strength saving throw or be knocked prone.

Rotting Swipe: Melee Weapon Attack (claw): +2 to hit, reach 5 ft., 1 target. Hit: 1d8 slashing damage. If Wraith's Companion crits on 19-20, add 2d8 necrotic to total damage.

Lock Jaw: After a successful Bite attack, it may choose to clamp down, causing the target creature 1d4 bleeding damage. Target creature must attempt a DC 14 strength saving throw every turn Wraith's Companion's jaw is locked. On a fail, target takes 1d4 bleeding damage. On a success, the beast releases the target creature.