Improved Undead Fortitude. If damage reduces the zombie to 0 Hit Points, it must make a Constitution saving throw with a DC equal to the damage taken unless the damage is Radiant or from a Critical Hit. On a successful save, the zombie drops to 1 Hit Point instead.

Memories of Rent Flesh. Wretched Assassins retain some of their abilities from a career in killing. They possess a Sneak Attack equivalent to a rogue's of their hit dice (4d6) and can take Cunning Actions. Attacks against helpless creatures automatically kill the creature if it brings them to 0 or fewer hit points.

Envenomed Slam. Melee Attack Roll: +8, reach 5 ft. Hit: 11 (2d6 + 4) Bludgeoning damage plus 9 (2d8) Poison damage. A struck creature must succeed on a DC 14 Constitution Saving Throw or become poisoned. This condition remains until cured.

Viscera Dagger. Ranged Attack Roll: +8, range 30/60. Hit: 13 (2d6 + 6) Piercing damage. This attack can critically strike on an 18, 19, or 20. Any result less than a natural 20 must still strike a creature's AC.

Cunning Action. Wretched Assassins can Move, Dodge, or Hide as a Bonus Action on their turn.