Marquis of Death

The Marquis of Death is a supremely powerful supervillain from Marvel comics and is considered by many as one of the most powerful entities to ever be created by Marvel comics - this is a bold statement in a multiverse populated by innumerable reality-warpers and cosmic-entities but is largely supported by the events that took place in the saga that involved this infamous entity. The Marquis of Death's involvement in current Marvel lore is unknown but as of his defeat in the original saga he is not deceased but rather imprisoned in a mysterious room - it took the combined efforts of almost all Marvel's heroes and villains and an alternate version of himself to weaken the entity sufficiently for Doctor Doom (himself greatly amplied) to strike the final blow and end the Marquis of Death's reign of terror upon the multiverse as a whole.