Web Golem

Immutable Form. The golem is immune to any spell or effect that would alter his form.

Magic Resistance. The golem has advantage on saving throws against spells and other magical effects.

Magic Weapons. The golem's weapon attacks are magical.

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

Web Walker. The golem ignores movement restrictions caused by webbing.

Multiattack. The golem makes two melee attacks and a Grapple, or uses its Web attack.

Slam. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 16 (3d6 + 5) bludgeoning damage.

Bite. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 8 (1d10 +3) piercing damage and 24 (3d10 + 6) poison damage

Grapple. Whenever the golem succeeds on a melee attack, its target must make a DC 17 Strength saving throw or be grappled by it. Any grappled targets may make the check again come their next turn. Any targets grappled by the golem are restrained. The golem can continue attacking ignoring any creatures grappled.

Web (Recharges 5-6). Ranged Weapon Attack: +13 to hit, range 30/60 ft., one creature. Hit: The target is restrained by webbing. As an action, the restrained target can make a DC 17 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 15; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).