Gibbering MoutherCR 2 · Medium Aberration · Stat Block & Encounter Builder

Medium aberration, Challenge 2. AC 9, 67 hit points.

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Armour Class

Hit Points

Speed

10 ft.

Challenge

2 · 450 XP

Alignment

Neutral

The card

Stat Block

Medium Aberration · Neutral

Gibbering Mouther

9d8 + 27 · 10 ft., swim 10 ft.

Darkvision 60 ft., passive Perception 10

Languages: —

STR	DEX	CON	INT	WIS	CHA
10 (+0)	8 (-1)	16 (+3)	3 (-4)	10 (+0)	6 (-2)

Traits

Condition ImmunitiesProne

Aberrant GroundThe 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.

GibberingThe 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

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

BitesMelee 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 SpittleThe 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 to actually run it

Tactics

The stat block tells you what it can do. This tells you what to do with it.

1Multiattack: The gibbering mouther makes one bite attack and, if it can, uses its Blinding Spittle.

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Encounter Difficulty

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How bad is this fight?

Real DMG maths — XP thresholds by level, and the group multiplier that makes crowds so much worse than the raw total suggests.

Gibbering Mouthers4Party size4Party level3

Could kill someone — and at high enough numbers, the whole party.

Difficulty

Deadly

3,600 adj. XP · ×2

deadly at 1,600

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Counsel

Gibbering Mouther, Answered

What is Gibbering Mouther's challenge rating in D&D 5e?

Gibbering Mouther is Challenge 2, worth 450 XP. Encounter maths multiplies XP by the number of monsters, so a group is deadlier than the raw total — use the calculator on this page.

What are Gibbering Mouther's stats?

AC 9, 67 hit points (9d8 + 27), speed 10 ft., swim 10 ft.. Ability scores: STR 10, DEX 8, CON 16, INT 3, WIS 10, CHA 6.

Where does Gibbering Mouther fit in an encounter?

As a aberration of Challenge 2, it suits a party whose level is in the same range. Adjust party size and level in the builder above to see the difficulty shift live.

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