The many universes of DC Comics contain untold intergalactic and eldritch horrors. Beings like Nekron or Darkseid loom over all life waiting for their time to strike, but readers are pretty accustomed to world-threatening bad guys. The scariest DC villains, the ones who are genuinely terrifying, are often a little more grounded.
Source:https://www.cbr.com/scary-dc-villains/