Who Would Win?

Mephisto

Lord of a realm of Hell

Demonic Power, Reality Warping, Immortality, Soul Manipulation, Shape-Shifting, Energy Projection, Superhuman Strength

None (demonic power)

Hell-lords, Lords of the Splinter Realms; formerly manipulator of the Six-Fingered Hand

Lorna Sally Dane

Adventurer, former U.S. government operative, former graduate student in geophysics

Flight, Agility, Stamina, Intellect, Force Field, Blast Power, Super Sight, Magnetism, Unarmed Combat, Electronic interaction, Electronic Disruption, Gravity control, Marksmanship, Energy Absorption, Energy Manipulation, Leadership

X-Men Uniform, Magneto's Helmet (briefly)

Acolytes, Defenders, Exiles, Hellfire Club, Horsemen of Apocalypse, House of Magnus, Hysteries, Marauders, Muir Island X-Men, Mutant Liberation Front, Mutant Underground, Polaris' X-Men, Serval Industries, Starjammers, The Six, The Twelve, X-Factor, X-Gene Mutant, X-Men