What do you think is the creepiest monster/enemy in any video game (recent ones are fine with me)
[spoiler]The wendigo from Until Dawn[/spoiler]
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Creepy... For what they do, or according to lore I'd have to say the flood. They rip through your memory, slowly learning everything you know, destroying who you are, and you're constantly in pain, and aware of what they're doing, but there's no way to stop it.