Web Zombie

Necrotic Weapons. When the web zombie hits a creature with a melee attack, the attack deals an extra 1d6 necrotic damage.

Spider Climb. The web zombie can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Web Walker. The web zombie ignores movement restrictions caused by webbing.

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.

Multiattack. The web zombie makes two slam attacks. If both attacks hit a Medium or smaller target, the target is restrained by webbing. As an action, the restrained target can make a DC 11 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 5; vulnerability to fire damage; immunity to bludgeoning, necrotic, poison, and psychic damage).

Slam. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage.