Werewolf

The monster has Advantage on an attack roll against a creature if at least one of the monster's allies is within 5 feet of the creature and the ally doesn't have the Incapacitated condition.

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The monster makes two attacks, using Scratch or Longbow in any combination. It can replace one attack with a Bite attack.

. . If the target is a Humanoid, it is subjected to the following effect.
Constitution Saving Throw: DC .
Failure: The target is cursed. If the cursed target drops to 0 Hit Points, it instead becomes a Werewolf under the DM's control and has 10 Hit Points.
Success: The target is immune to this monster's curse for 24 hours.

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The monster shape-shifts into a Large wolf-humanoid hybrid form or a Medium wolf, or it returns to its true humanoid form, or it returns to its true form. Its game statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn't transformed.