Amorphous. The shadow can move through a space as narrow as 1 inch, and doing so costs it no extra movement.
Sunlight Weakness. While the shadow is in sunlight, it has Disadvantage on D20 Tests.
Actions
Draining Swipe. Hit: 5 (1d6 + 2) Necrotic damage, and the target's Strength score is reduced by 1d4. If this brings the score to 0, the target dies. A Humanoid killed by this attack rises as a new Shadow 1d4 hours later.
Bonus actions
Shadow Stealth. If the shadow is in Dim Light or Darkness, it can take the Hide action as a Bonus Action.