N Medium Aberration
Senses Perception +15; darkvision
Skills Acrobatics +12, Athletics +13
Str +2, Dex +3, Con +4, Int -3, Wis +3, Cha +0
AC 21, All-Around Vision; Fort +15, Ref +12, Will +10
HP 120; Weaknesses bludgeoning 5
Gibbering (auditory, aura, emotion, enchantment, incapacitation, mental, occult) Each creature that begins its turn within 60 feet of a gibbering mouther must attempt a DC 19 Will save. On a failure, they are confused for 1 round. On a success, they are temporarily immune for 1 minute.
Reactive Gnaw Trigger An adjacent creature deals the gibbering mouther slashing damage. Effect The gibbering mouther's wound opens into another maw. It makes a jaws Strike against the triggering creature.
Speed 10 feet, swim 20 feet
Melee jaws +14 (finesse), Damage 2d8+5 piercing plus 1d4 persistent bleed damage and Grab
Ranged spittle +14 (range 30 feet), Damage 4d6 acid and burn eyes
Burn Eyes A creature that takes damage from a gibbering mouther's spittle must succeed at a DC 22 Fortitude save or be dazzled for 1 round (or blinded for 1 round on a critical failure).
Engulf DC 22, 3d8 piercing, Escape DC 22, Rupture 8
Ground Manipulation (occult, transmutation) The gibbering mouther causes stone and earth under its body to grow soft and muddy, remaining so for 1 minute after the mouther moves off the location. A gibbering mouther can move through these areas with ease, but other creatures treat them as difficult terrain.
Amorphous blobs of yammering mouths and oozing, fleshy sludge, gibbering mouthers are among the strangest creatures found either aboveground or below.
Perpetually ravenous, these aberrations are always seeking their next meals, ever eating but never sated. With a nominal intelligence, gibbering mouthers can understand and even speak Aklo, but they do so in an intelligible manner only rarely. Instead, their innumerable mouths constantly jabber and babble in a stream of sound that disrupts the thought patterns of other creatures in the area.
Where, how, and why gibbering mouthers originated are questions without answers.
They share certain similarities with the much more powerful shoggoths, leading to theories that the two creatures share an origin; less charitable scholars have suggested that the gibbering mouther is instead a mortal's attempt to create something akin to a shoggoth—though the question of why remains unanswered. Still others believe gibbering mouthers were sent to the world by the gods as a punishment for some forgotten but surely terrible transgression. Gibbering mouthers themselves have little to say on the matter—at least, not in any sort of sense. Scholars have wasted countless hours in attempts to make sense of gibbering mouthers' noises—studies that put researchers into danger and give results that are contradictory and confusing at best.