Ikaris' life force is augmented by cosmic energy and he has total mental control over his physical form and bodily processes even when he is asleep or unconscious. As a result, he is virtually immortal, immune to disease and aging, and invulnerable to conventional forms of injury. Should Ikaris be injured somehow, he could regenerate any injured or missing tissue. Cosmic energy bolsters Ikaris's metabolism so that he does not tire from any physical exertion. He can resist temperature extremes through mental concentration.