Medium Undead, Chaotic Evil
Traits
Amorphous. The shadow can move through a space as narrow as 1 inch without expending extra movement to do so.
Sunlight Weakness. While in sunlight, the shadow has Disadvantage on D20 Tests.
Actions
Draining Swipe. Melee Attack Roll: +4, reach 5 ft. Hit: 5 (1d6 + 2) Necrotic damage, and the target's Strength score decreases by 1d4. The target dies if this reduces that score to 0. If a Humanoid is slain by this attack, a Shadow rises from the corpse 1d4 hours later.
Bonus Actions
Shadow Stealth. While in Dim Light or Darkness, the shadow takes the Hide action.
Found on p.272 of MM2025 (Free Rules)