|Damage:||Instant Kill (Melee)|
|Encountered in:||Various parts of Afraid Of Monsters|
The Mouth Monster refers to an enemy encountered in Afraid of Monsters: Director's Cut. The monster will appear as a 3 dark brown tendrils hanging from a hole in the ceiling of a room or outdoor geometry. The body of the monster itself is, unlike the barnacle in Half-Life, never actually seen. Once the tendrils grab the player, an encounter with the Mouth Monster will result in an instant kill if the player is unable to shoot it before being pulled into the monster's mouth.
- Its model from the original version of the game is a reskinned-version of the Barnacle from Half-Life.