The monster mask resembles a large, pale, grinning humanoid face with a massive red-tinted nose. The head has red hair made up of small, rectangular strips of material.
Temporarily acquired during the Monster Mash event at Watoga High School, spawning in a randomly selected location at the start of each round. When a Vault Dweller is killed while wearing the mask, it is dropped on the ground and may be retrieved by another player. If it is not retrieved within 5 seconds, it will be re-hidden. It is removed from the player inventory at the end of the event.
Behind the scenes
The monster mask may appear to persist after leaving the Monster Mash event under certain circumstances. This is visual only.[verified]