Horror has long had a home in Marvel Comics. Heroes like Werewolf by Night, Elsa Bloodstone, and Blade have pitted themselves against the worst of Marvel's monsters for decades. Earth-616 is home to vampires, cryptids, and werewolves that rule entire empires within the universe. However, most of those monsters are just features of fun comics that just barely touch on their potential horror elements.
Source:https://www.cbr.com/terrifying-marvel-villains-ranked/