Regeneration. The revenant regains 10 hit points at the start of its turn. If the revenant takes fire or radiant damage, this trait doesn’t function at the start of the revenant’s next turn. The revenant’s body is destroyed only if it starts its turn with 0 hit points and doesn’t regenerate.

Rejuvenation. When the revenant’s body is destroyed, its soul lingers. After 24 hours, the soul inhabits and animates another humanoid corpse on the same plane of existence and regains all its hit points. While the soul is bodiless, a wish spell can be used to force the soul to go to the afterlife and not return.

Vengeful Tracker. The revenant knows the distance to and direction of any creature against which it seeks revenge, even if the creature and the revenant are on different planes of existence. If the creature being tracked by the revenant dies, the revenant knows.

Massacre. When the vendetta kills one of its targets it gets an extra turn which lets them take an extra turn every time they kill one of their targets.

Possession. When the vendetta dies it can possess one of its targets

Improved Critical. The Vendetta's weapon attacks score a critical hit on a roll of 19 or 20

Multiattack. The revenant makes two fist attacks.

Vengeful Glare. The revenant targets one creature it can see within 30 feet of it and against which it has sworn vengeance. The target must make a DC 15 Wisdom saving throw. On a failure, the target is paralyzed until the revenant deals damage to it, or until the end of the revenant’s next turn. When the paralysis ends, the target is frightened of the revenant for 1 minute. The frightened target can repeat the saving throw at the end of each of its turns, with disadvantage if it can see the revenant, ending the frightened condition on itself on a success.

 Longsword.  Melee weapon attack: +12 to hit , reach 5 ft, 1 target. Hit:  22 (3d8 + 8) slashing damages.