Carrion Golem

Immutable Form. The Golem is immune to any spell or effect that would alter its form.

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

Magic Weaons. The Golem weapons are not magical.

Mutiattack. The Golem makes two slam attacks

Slam. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 19 (3d8 + 6 [bludgeoning] damage plus 16 (3d10 + 1) [necrotic] damage

Breath Weapon (Recharge 5-6). The Golem releases a paralysing corrosive gas in a 30 ft cone. Each creature in that area must make a DC17 Constitution Saving Throw or be paralyzed for 1 minute, and take 27 (6d8 +3) acid damage on a failed save, or half as much on a successful one. The paralyzed creature repeats its saving throws at the end of each of its turns, ending the effect on itself with a success.