>>718221537
Picrel comes close. In the one ending where you finally do get a chance to "view" the Visitor, you go insane by glimpsing just a fraction of it, and your rapidly-mutating mass of flesh ends up engulfing the world and dooming humanity.
Even indirect observation causes some brutal transformations, let alone looking at the one piece of it that's lingering on Earth.
But yeah, as others have mentioned, the moment you actually TRY to portray it, you lose, because you're trying to condense something incomprehensible into something that can be, losing the whole effect.