All-Devouring Biovore

Flesh Regeneration. At the start of each of the Biovore’s turns, it regains 20 hit points if it has at least 1 hit point and isn’t in sunlight or on consecrated ground.

Pained Screams. When the Biovore takes damage, each creature within 10 feet of it that can hear it must succeed on a DC 18 Wisdom saving throw or be frightened until the end of its next turn.

Fleshy Slap. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 21 (3d10 + 5) bludgeoning damage.

Barf Shot. Ranged Weapon Attack: +10 to hit, range 60/180 ft., one target. Hit: 27 (6d8) acid damage.

Self-Digestion. If the Biovore scored a natural 20 on an attack roll since the start of its last turn, it can use this bonus action to regain hit points equal to 40 (double the amount restored by its Flesh Regeneration trait). If it does, the Biovore can make one fewer attack on its next turn (minimum one attack).

Oozing Misery. When a creature within 10 feet of the Biovore hits it with a melee attack, the Biovore can use its reaction to force the attacker to make a DC 18 Constitution saving throw. On a failed save, the creature takes 13 (3d8) acid damage and has disadvantage on attack rolls until the end of its next turn.