10 Fantastic Four Villains MORE Powerful Than Galactus
8. Mephisto
Mephisto is an extra-dimensional being who rules a fiery realm, colloquially known as Hell. Mephisto is energised by the evil that inhabits all living things. Since Earth is inhabited by a bajillion supervillains, they have kept the prince of darkness' power satiated since the dawn of mankind.
Being the world's most powerful demon, there is little that Mephisto can't do. Not only can he reshape reality, he has proven capable of merging realities together (as he proved in the infamous One More Day storyline.)
However, Mephisto rarely uses his full power since he takes greater pleasure in manipulating people to give up their souls. Over the years, the duplicitous devil has wrangled billions of souls, including those of Doctor Doom, Black Panther, Daredevil, Silver Surfer, Ghost Rider, and Deadpool.
On multiple occasions, Mephisto even managed to con the Fantastic Four (despite the fact Reed Richards is smarter than eight Stephen Hawkings).
As scary as Galactus is, Mephisto is infinitely more terrifying since the great king of evil can manipulate anyone to give up their soul, damning them to Hell for all eternity.