Bloodrot

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

Any healing in excess of the bloodrot's maximum hit points is gained as temporary hit points. Furthermore, when a living creature within 5 feet of the bloodrot is reduced to 0 hit points, the bloodrot regains 25 hit points and grows one size category larger.

A creature that touches the bloodrot or hits it with a melee attack while within 5 feet of it takes 4 (1d8) acid damage.

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) bludgeoning damage plus 18 (4d8) acid damage.

Melee Weapon Attack: +5 to hit, reach 5 ft., one creature grappled by a bloodrot. Hit: 17 (5d6) necrotic damage, and the bloodrot regains hit points equal to half the damage dealt.

The bloodrot attempts to grapple one creature within 5 feet of it. It can have one creature grappled at a time.

When a bloodrot that is Medium or larger is subjected to lightning or slashing damage, it splits into two new bloodrots if it has at least 10 hit points. Each new bloodrot has hit points equal to half the original bloodrot's, rounded down. New bloodrots are one size smaller than the original bloodrot.