Aberrant Ground. The ground in a 10-foot radius around the mouther is doughlike 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 20 feet 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 5 ft., 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 15 feet of it. The glob explodes in a blinding flash of light on impact. Each creature within 5 feet of the flash must succeed on a DC 13 Dexterity saving throw or be blinded until the end of the mouther's next turn.
How many gibbering mouthers for a fight?
A gibbering mouther is worth 450 XP. Using the 2024 encounter budgets (SRD 5.2), this is how many gibbering mouthers fit each difficulty for a party of four characters of the same level. A dash means even one would be over the budget.
Party level
Low
Moderate
High
2nd
—
1
1
3rd
1
2
3
4th
2
3
4
5th
4
6
9
6th
5
8
12
7th
6
11
12+
8th
8
12+
12+
9th
11
12+
12+
Budgets add up every monster’s XP, so you can swap some for other creatures of the same total. Try other party sizes and mixes in the encounter calculator.
How the gibbering mouther compares at CR 2
Against the 42 other challenge 2 monsters in the SRD 5.1, the gibbering mouther has more hit points than 37 of them, which makes it one of the toughest at its CR. See every CR 2 monster.
Statistic
Gibbering Mouther
CR 2 average
Armor Class
9
13
Hit points
67
46
Best attack bonus
+2
+5
Gibbering Mouther 2024 stat block
The 2024 Monster Manual revised the gibbering mouther, and the SRD 5.2 carries the new stat block. What changed:
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. Hit: 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 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.
