Clay Golem

Whenever the monster is subjected to Acid damage, it takes no damage and instead regains a number of Hit Points equal to the Acid damage dealt.

Whenever the monster starts its turn Bloodied, roll . On a 6, the monster goes berserk. On each of its turns while berserk, the monster attacks the nearest creature it can see. If no creature is near enough to move to and attack, the monster attacks an object. Once the monster goes berserk, it remains so until it is destroyed or it is no longer Bloodied.

The monster can't shape-shift.

The monster has Advantage on saving throws against spells and other magical effects.

The monster makes two attacks, or it makes three Slam attacks if it used Hasten this turn.

. , and the target's Hit Point maximum decreases by an amount equal to the Acid damage taken.

The monster takes the Dash and Disengage actions.