eldritch abomination
A type of creature defined by their complete disregard for the natural laws of the universe as we understand them and oftentimes the love for body horror. Their physical form (if they even have one) is so bizarre, it even can make someone mad just by looking at it.
All Lovecraftian horrors (Cthulhu, Hastur, Nyarlathotep, etc.) are of this type.
Examples
