Amorphous The pudding can move through a space as narrow as 1 inch wide without squeezing.   Corrosive Form A creature that touches the pudding or hits it with a melee attack while within 5 feet of it takes 4 1d8 acid damage. Any nonmagical weapon made of metal or wood that hits the pudding corrodes. After dealing damage, the weapon takes a permanent and cumulative −1 penalty to damage rolls. If its penalty drops to −5, the weapon is destroyed.   Nonmagical ammunition made of metal or wood that hits the pudding is destroyed after dealing damage.   The pudding can eat through 2-inch-thick, nonmagical wood or metal in 1 round.   Spider Climb The pudding can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.