Armored Black Pudding

Antimagic Susceptibility. The armor of the Armored Black Pudding is incapacitated while in the area of an antimagic field and Armored Black Pudding receives -3 AC while in the field. If targeted by dispel magic, the Armored Black Pudding must succeed on a Constitution saving throw against the caster's spell save DC or receives -3 AC for 1 minute.

False Appearance. While the Armored Black Pudding remains motionless, it is indistinguishable from a normal suit of armor.

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.

Spider Climb. The pudding can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Multiattack. The Armored Black Pudding makes two melee attacks.

Slam. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 3) bludgeoning damage.

Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) bludgeoning damage plus 18 (4d8) acid damage. In addition, nonmagical armor worn by the target is partly dissolved and takes a permanent and cumulative −1 penalty to the AC it offers. The armor is destroyed if the penalty reduces its AC to 10.

Split. When a pudding that is Medium or larger is subjected to lightning or slashing damage, it splits into two new puddings if it has at least 10 hit points. After the initial split, only one pudding is Armored Black Pudding. The new split pudding(s) are and have the stat block of Black Pudding. Each new pudding has hit points equal to half the original pudding's, rounded down. New puddings are one size smaller than the original pudding.