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.

Slam. Melee Weapon Attack: +2 to hit, reach 5 ft., one target. Hit: 4 (1d6) bludgeoning damage.

Frostbite. The target must make a Constitution saving throw (DC10). On a failed save, the target takes 1d6 cold damage, and it has disadvantage on the next weapon attack roll it makes before the end of its next turn.

Acid Splash. A target and one other creature within 5 ft. must succeed on a Dexterity saving throw (DC10) or take 1d6 acid damage.