Gibbering Mouther

Medium aberration, neutral

Armor Class 9

Hit Points 67 (9d8+27)

Speed 10ft., swim 10ft.

Condition Immunities prone

Senses darkvision 60ft., passive Perception 10

Languages -

Challenge 2 (450 XP)

Traits

Aberrant Ground

The ground in a 10ft radius around the mouther is dough-like difficult terrain. Each creature that starts its turn in that area must succeed on a DC 10 Strength saving throw or have its speed reduced to 0 until the start of its next turn.

Gibbering

The mouther babbles incoherently while it can see any creature and isn't incapacitated. Each creature that starts its turn within 20ft of the mouther and can hear the gibbering must succeed on a DC 10 Wisdom saving throw. On a failure, the creature can't take reactions until the start of its next turn and rolls a d8 to determine what it does during its turn. On a 1 to 4, the creature does nothing. On a 5 or 6, the creature takes no action or bonus action and uses all its movement to move in a randomly determined direction. On a 7 or 8, the creature makes a melee attack against a randomly determined creature within its reach or does nothing if it can't make such an attack.

Actions

Multiattack

The gibbering mouther makes one bite attack and, if it can, uses its Blinding Spittle.

Bites

Melee Weapon Attack: +2 to hit, reach 5ft., one creature.
Hit: 17 (5d6) piercing damage. If the target is Medium or smaller, it must succeed on a DC 10 Strength saving throw or be knocked prone. If the target is killed by this damage, it is absorbed into the mouther.

Blinding Spittle (Recharge 5-6)

The mouther spits a chemical glob at a point it can see within 15ft of it. The glob explodes in a blinding flash of light on impact. Each creature within 5ft of the flash must succeed on a DC 13 Dexterity saving throw or be blinded until the end of the mouther's next turn.