Unholy Stench. Any creature other than an excremental that starts its turn within 15 feet of the excremental must succeed on a DC 13 Constitution saving throw or be frightened until the start of the creature's next turn. On a successful saving throw, the creature is immune to the Unholy Stench of all excrementals for 1 hour.

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

Water Susceptibility. For every 5 feet the elemental moves in water, or for every gallon of water splashed on it, it takes 1 cold damage.

Freeze. If the elemental takes cold damage other than that caused by Water Susceptibility, it partially freezes; its speed is reduced by 20 feet until the end of its next turn.

Multiattack. The elemental makes two slam attacks.
Slam. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 14 (2d8 + 5) bludgeoning damage.

Split. When an excremental that is Medium is subjected to slashing damage, it splits into two new excrementals if it has at least 10 hit points. Each new excremental has hit points equal to half the original excremental's, rounded down. New excrementals are one size smaller than the original excremental.