Sinmold

Sinmolds are aware that they're in a vulnerable state as formless "newborn fiends" and are desperate to become stronger before they become prey to more powerful demons. Whenever the sinmold is in a combat encounter and ends its turn without dealing damage to another creature, the sinmold takes 3d6 mental damage and becomes Frightened 1.

The first time in a round when the sinmold damages a creature with Engulf, the sinmold immediately restores Hit Points equal to the damage dealt, gaining Hit Points in excess of its maximum as temporary Hit Points that last for 1 hour. As long as the sinmold possesses these temporary Hit Points, its surface hardens, and its AC increases to 30.

DC 32 reflex, 3d10 acid damage plus digestion, , Rupture 18

Saving Throw DC 32 fortitude

Maximum Duration 6 rounds

Stage 1 2d8 poison damage (1 round)

Stage 2 3d8 poison damage and can hear the thoughts of root rotters within 30 feet as an imprecise sense (1 round)

Stage 3 as stage 2, but 4d8 poison damage and Doomed 1 (1 round)

Stage 4 as stage 3, and arise as a root rotter upon death (1 round)

Requirements The sinmold has temporary Hit Points from digestion

Effect The sinmold loses all temporary Hit Points and releases any creatures it currently has engulfed, pushing them into the nearest unoccupied spaces. It releases a cloud of spores from its body, dealing 5d8 poison damage (DC 29 fortitude save) in a 20-foot emanation. Any creature that fails this save also must attempt a save against sinmold infestation.