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The Horror Monster (in-game name Kauhuhirviö) is a secret flying creature in Noita. It has a comical cartoon-like face and simple sprite.
Upon death, it explodes in a massive area, roughly the size of a Holy Bomb explosion, depositing a large amount of Slime and causing an earthquake effect (similar to the Earthquake spell) in the process.
If provoked, it spits harmless seeds at its assailant which grow various kinds of small trees and shrubs if they hit the ground. Nine Horror Monsters can be found in a small room that generates in every paralel world, along with one Toveri. The location of the room differs with every seed; locating it requires the spatial awareness perk. The Horror Monster also spawns in the Frozen Vault, albeit very rarely. It may also be encountered from Hahmonvaihtaja or as a result of Chaotic Polymorphine.