Strahd Skeleton

If damage reduces the skeleton to 0 Hit Points, it makes a Constitution saving throw (DC 5 plus the damage taken) unless the damage is Radiant or from a Critical Hit. On a successful save, the skeleton drops to 1 Hit Point instead.

The skeleton makes two Vampiric Longsword attacks. It can replace one attack with a use of Shield Bash.

Melee Attack Roll: +5, reach 5 ft. Hit: 7 (1d8 + 3) Slashing damage plus 7 (2d6) Necrotic damage. The target's Hit Point maximum decreases by an amount equal to the Necrotic damage taken.

Strength Saving Throw: DC 13, one creature within 5 feet that the skeleton can see. Failure: 10 (2d6 + 3) Bludgeoning damage. If the target is a Medium or smaller creature, it has the Prone condition