Butter Golem

Amorphous. The golem(melted) can move through a space as narrow as 1 inch wide without squeezing.

Butter. The golem only regenerates hit points through consuming butter. 1 pound (around 0.45 kg) of butter restores 16 hit points.

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

Slam. Melee Weapon Attack: +6 to hit, reach 10 ft., one creature. Hit: 10 (3d6) bludgeoning damage.

Engulf. The golem(melted) moves up to its speed. While doing so, it can enter Large or smaller creatures' spaces. Whenever the golem(melted) enters a creature's space, the creature must make a DC 15 Dexterity saving throw.

On a successful save, the creature can choose to be pushed 5 feet back or to the side of the golem. A creature that chooses not to be pushed suffers the consequences of a failed saving throw.

On a failed save, the golem(melted) enters the creature's space, and the creature takes 7 (2d6) bludgeoning damage and is engulfed. The engulfed creature can't breathe, is restrained, and takes 7 (2d6) bludgeoning damage at the start of each of the golem's turns. When the golem moves, the engulfed creature moves with it. 

An engulfed creature can try to escape by taking an action to make a DC 15 Strength check. On a success, the creature escapes and enters a space of its choice within 5 feet of the golem. The creature gains a level of exhaustion every 3 turns since being engulfed.

Butter Up. The golem says “lets butter it up” and any creature inside it is covered in butter. This makes any movement difficult terrain for the creature and the creature gets a -2 to attack rolls. These effects last until the butter is removed. The golem takes 3 (1d6) piercing damage.

Melt/Form. If the golem is in its normal form it melts and its movement speed is halved. If the golem is in its melted form it becomes its normal form and its movement speed is restored.