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From Marvel Directory: For most of his life, Count Nefaria possessed no superhuman powers. But due to Professor Kevin Sturdy's treatment, Nefaria gained the powers of the Living Laser, now a being of pure energy; Power Man, before becoming Atlas; and the Whirlwind. However, each of Nefaria's superhuman abilities is a hundred times greater than its source. Besides superhuman strength, Nefaria possesses extraordinary resistance to injury. (He survived a blow from Thor's hammer unharmed.) Having returned from the dead transformed into an ionically powered entity like Wonder Man, Nefaria must feed on the energies of other ionic beings to sustain his own powers.

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Graviton possesses the ability to mentally manipulate gravitons (that carry the attractive, gravitational force between atomic nuclei), enabling him to control gravity. He can surround any object or person including himself with gravitons and anti-gravitons (particles similar to gravitons but with opposite charge and spin), thus increasing or decreasing the Earth's pull of gravity upon it. By decreasing the pull of gravity beneath him, he can fly at any speed or height at which he can still breathe. By increasing the pull of gravity beneath his opponents, he can pin them to the ground, having made them too heavy to move, or cause sufficient gravitational stress to impair the normal functioning of the human cardiovascular system. He can also cause an inanimate object (such as a 1-foot diameter rock) to radiate enough gravitons to give it its own gravitational field, able to attract nearby matter and energy.

By rapidly projecting gravitons in a cohesive beam, he can generate a force blast with a maximum concussive force equivalent to the primary shockwave of an explosion of 20,000 pounds of TNT. He can also create a gravitational force field around him capable of protecting him from any concussive force up to and including a small nuclear weapon.

Graviton can exert his gravitational control over a maximum distance of 2.36 miles from his body. Thus, the maximum volume of matter he could influence at once is 6.88 cubic miles. He once exercised this control by lifting into the air an inverted conic frustum-shaped land mass whose uppermost area was 4 miles across, and causing it to fly as though it were a dirigible. He can also erect a gravitational force-field of similar proportions. (Graviton can perform as many as four separate tasks simultaneously. (He has not only lifted a 4 mile wide land mass as high as cloud level, but he has also surrounded himself with a force-field, gravitically held most of the Avengers against a slab of rock, and projected force-bolts at Thor all at the same time.) Graviton can use his power at maximum capacity for up to eight hours before mental fatigue significantly impairs his performance, and considerably longer (up to eighteen hours) if he conserves his energy during that time.