Undead Fortitude. If damage reduces the Biomass to 0 Hit Points, it must make a Constitution saving throw with a DC of 5+ the damage taken. The DC is increased by 10 if the damage is radiant or from a critical hit. On a success, the Biomass drops to 1 hit point instead.
Consume Creatures. When the Biomass moves into the space of a dead monster, it consumes the monster, increasing its current and maximum hit points by three times the monster's CR (rounded up).
Toxic Decay. When a creature starts its turn touching the Biomass, or touches the Biomass during its turn, it takes 1d4 poison damage per turn that it has been touching the Biomass. This damage resets to 1d4 when the creature stops touching the Biomass.
Multiattack. The Biomass makes two Gruesome Swing attacks and one Slam attack.
Gruesome Swing. Melee Weapon Attack: +8 to hit, reach 15 ft., 1 target. Hit: 20 (4d4 + 10) bludgeoning damage.
Slam. Melee Weapon Attack: +0 to hit, reach 10 ft., all creatures within range. Hit: 14 (3d6 + 4) bludgeoning damage. Every creature hit by the attack must make a Dexterity saving throw with a DC equal to half the damage taken (rounded down), getting knocked prone on a failed save.
Consume Undead. When a Medium or smaller undead with a CR less than 5 makes a melee attack against the Biomass, the Biomass moves into its space and uses its Consume Creatures feature.
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