Brown Pudding

Amorphous. The pudding can move through a space as narrow as 1 inch wide without squeezing.

Fecal Form. A creature that touches the pudding or hits it with a melee attack while within 5 feet of it takes 4 (1d8) poison damage. Any creature within 15' of the Brown Pudding must make a successful Constitution save vs. DC 12 or be sickened for 1d4 rounds. Once the creature ends the sickened condition, it is immune to this ability for 24 hours.

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

Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) bludgeoning damage plus 18 (4d8) poison damage. In addition, any creature that touches or attacks the Brown Pudding with a melee attack must make a successful Constitution save vs. DC 12 or be sickened for 1d4 rounds. Once the creature ends the sickened condition, it is immune to this ability for 24 hours.

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. 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.