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In Avengers Now!, the Hyperion section says the following: He is virtually tireless due to his metabolism converting fatigue-poisons into cellular energy. His body is unharmed by extreme variations in pressure and temperature (from -455 to 11000 degrees Fahrenheit).
Also in the respect thread of the page shows absorbing toxic gases through the mouth without any damage.
Also in the respect thread of the page shows absorbing toxic gases through the mouth without any damage.