Black Pudding

The monster can move through a space as narrow as 1 inch without expending extra movement to do so.

A creature that hits the monster with a melee attack roll takes damage. Nonmagical ammunition is destroyed immediately after hitting the monster and dealing any damage. Any nonmagical weapon takes a cumulative −1 penalty to attack rolls immediately after dealing damage to the monster and coming into contact with it. The weapon is destroyed if the penalty reaches −5. The penalty can be removed by casting the Mending spell on the weapon. In 1 minute, the monster can eat through 2 feet of nonmagical wood or metal. This feature provides an Attack Penalty active effect that will modify a targeted weapon. Since this penalty can be applied multiple times to multiple nonmagical weapons, this active effect needs to be dragged from this item's Effect tab onto the target Item's weapons.

The monster can climb difficult surfaces, including along ceilings, without needing to make an ability check.

Trigger: While the monster Response: The monster splits into two new monster. Each new monster is one size smaller than the original monster and acts on its Initiative. The original monster's Hit Points are divided evenly between the new monsters (round down).

Melee Attack: +5 to hit. reach 10 ft. Hit: 4d6 + 3 acid damage.