Regeneration. The revenant regains 10 Hit Points at the start of its turn. If it took Fire or Radiant damage, this doesn't work at the start of its next turn. Its body is destroyed only if it starts its turn at 0 Hit Points and doesn't regenerate.
Rejuvenation. When the revenant's body is destroyed, its soul lingers. After 24 hours the soul enters and animates another Humanoid corpse on the same plane and regains all its Hit Points. While the soul has no body, a Wish spell can send it on to the afterlife for good.
Turn Immunity. The revenant is immune to effects that turn Undead.
Vengeful Tracker. Always knows the distance and direction to Strahd, the foe it hunts.
Actions
Multiattack. Makes two Greatsword attacks.
Greatsword. Against Strahd the hit deals an extra 14 (4d6) Slashing damage.
Vengeful Glare. Paralyzed until this creature damages him or until the end of its next turn; then Frightened for 1 minute (repeat save each turn). Text only for the engine.
Where you meet it
The Beacon Tower: Vladimir comes off the last step with his greatsword already moving. Behind him on the stair, dead knights in…
Argynvostholt, Ground Floor: Vladimir rises from the winged chair for the first time, and all down the table dead heads turn to watch. He…
Castle Ravenloft, Strahd's Tomb: Vladimir draws, and his knights come down the black stair behind him with their swords already out.