Initially he could not affect organic matter without painful, even lethal, feedback (i.e., fatal biophysical disruption or even localized particle motion phenomena like extreme changes in the weather). It was later revealed that Firestorm could always change organic matter, but opted not to. As Jason Rusch became Firestorm, however, this weakness appeared to have dissipated. With old and new variations, the organic limitation does not extend to his own person, as its users can molecularly change their driver self at will, allowing them to regenerate lost or damaged bodily tissue, boost immune systems, shape-shift, increase physical capabilities and survive indefinitely without food, sleep, water or air. Capacities as such produce superhuman levels of strength, durability, stamina and resistance to injury great enough to challenge the New Gods—the likes of Orion, Lashina, or an empowered Kalibak—or surviving the rigors of outer space and sitting near the inner corona above the sun's photosphere without discomfort. Firestorm's power has been stated by Prof. Stein to be theoretically infinite, harnessing the spark of creation, the Big Bang itself. However, infinite power runs the risk of burning out its host.