Gibbering Mouther
medium aberration, chaotic neutral
AC 9
Initiative -1 (9)
HP 52 (7d8 + 21)
Speed 20 ft., Swim 20 ft.
Senses Darkvision 60 ft. Passive Perception 10
CR 2 (XP 450; PB +2)
Aberrant Ground. The ground in a 10-foot Emanation originating from the mouther is Difficult Terrain.
Gibbering. The mouther babbles incoherently while it doesn't have the Incapacitated condition. Wisdom Saving Throw: DC 10, any creature that starts its turn within 20 feet of the mouther while it is babbling. Failure: The target rolls 1d8 to determine what it does during the current turn: - 1-4: The target does nothing. - 5-6: The target takes no action or Bonus Action and uses all its movement to move in a random direction. - 7-8: The target makes a melee attack against a randomly determined creature within its reach or does nothing if it can't make such an attack.
Actions
Bite. Melee Attack Roll: +2, reach 5 ft. 7 (2d6) Piercing damage. If the target is a Medium or smaller creature, it has the Prone condition. The target dies if it is reduced to 0 Hit Points by this attack. Its body is then absorbed into the mouther, leaving only equipment behind.
Blinding Spittle (Recharge 5-6). Dexterity Saving Throw: DC 10, each creature in a 10-foot-radius Sphere [Area of Effect]|XPHB|Sphere centered on a point within 30 feet. Failure: 7 (2d6) Radiant damage, and the target has the Blinded condition until the end of the mouther's next turn.
Gibbering Mouther is from the System Reference Document 5.2.1 (“SRD 5.2.1”) by Wizards of the Coast LLC, used under the Creative Commons Attribution 4.0 International License. Full attribution is on the Licenses & Attribution page.