Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Bottom Treader. The zombie cannot swim, and it sinks to the bottom of any body of water. It takes no penalties to its movement or attacks underwater. It is immune to the effects of being underwater at a depth greater than 100 feet.

Rakish Audacity. The first time each turn that the zombie hits a creature with a melee weapon attack, it can deal an extra 7 (2d6) damage of the weapon’s type, provided that there are no other creatures within 5 feet of the zombie or the creature and it didn’t have disadvantage on the attack roll.

Scimitar. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage plus 3 (1d6) cold damage.

Light Crossbow. Ranged Weapon Attack: +3 to hit, range 80/320 ft., one target. Hit: 5 (1d8 + 1) piercing damage plus 3 (1d6) cold damage.