source: http://marvel.wikia.com/Mephisto_(Earth-616)
Powers
Mephisto possesses vast supernatural power, which is apparently inherent within him.
Superhuman Strength: Mephisto possesses some degree of superhuman strength. He is capable of using his magical powers to augment his strength, enabling him to lift well in excess of 100 tons.
Superhuman Speed: Mephisto is capable of running and moving at speeds greater than even the finest human athlete.
Superhuman Stamina: The various mystical energies flowing through Mephisto's body augments his musculature so that it generates virtually no fatigue toxins during physical activity. As a result, Mephisto possesses almost limitless superhuman stamina.
Superhuman Durability: The tissues of Mephisto's body, while similar in appearance to a human's, are considerably tougher and more resistant to injury than the tissues of a human being. Mephisto's body is virtually invulnerable to conventional injury. He is capable of withstanding great impact forces, high caliber bullets, exposure to temperature and pressure extremes, and powerful energy blasts without sustaining injury.
Regenerative Healing Factor: Despite his superhuman durability, it is possible to injure Mephisto. However, his unique physiology and mystical energies enable him to rapidly recover from almost any form of injury. He is capable of regenerating almost any damaged or destroyed tissue, even missing limbs.
Immortality: As a demon, Mephisto is functionally immortal. He is immune to the effects of aging and is immune to all known Earthly diseases and infections. Mephisto is also beyond the need of food, water, or oxygen.
Magical Manipulation: He can use this magical energy for various effects, among which are the augmentation of his own physical strength, levitation, teleportation, the projection of mystical energy as force blasts, invisibility, matter manipulation, image projection, size transformation of his body or other objects or beings, the creation of temporary inter-dimensional apertures, and so on.
Ensnare Astral Bodies: Mephisto also possesses certain powers enabling him to capture and detain the astral bodies (sheaths of the soul) of recently deceased human beings.
Mephisto does not have jurisdiction over all the souls of humanity's recently deceased. It is not yet known what the prerequisite conditions are for him to be able to manipulate a human soul, nor are the precise means by which he accomplishes the feat known. Apparently these conditions require that the human being in question willingly agree to submit to Mephisto's will. It is not known how a human being may free himself from bondage to Mephisto (although Johnny Blaze apparently did), nor whether Mephisto will forever retain control of the souls he has obtained. Nor is it known whether or not Mephisto "feeds" on the psychic energies of such souls as other demons do.
Dimensional Entrapment: Apparently Mephisto can entrap a living human being within his realm through sheer physical force, even if the person did not submit his or her will to him. The woman named Topaz was thus entrapped until her recent escape.
Netherworld Dimensional Power Tap: Among the demons of various extradimensional netherworlds adjacent to Earth, Mephisto has few rivals in terms of personal power and scope of influence. Only Thog and Satannish come close. Mephisto's power seems to be connected to his extradimensional domain and diminishes over time spent away from it. Therefore, he usually sends demonic agents to do his bidding.
Abilities
Mephisto is an experienced and highly skilled liar and strategist. He is also a highly skilled sorcerer with near infinite knowledge of arcane and occult subjects.
Weaknesses
Despite his immense power, Mephisto does have several significant limitations. He is unable to force the subjugation of any sentient being's will to his own without that being's deliberate submission. He is also incapable of reading the thoughts of any sentient being. Mephisto's powers are linked with his extradimensional realm and his powers rapidly decrease the longer he is away from his realm. As a result, he typically uses or manipulates others into performing whatever plan he has in mind.
Equipment
A crystal that held Zarathos.
Transportation
Interdimensional teleportation using his own powers.
