The armor and Stark's own transhuman body are powered by the high-yield arc reactor mounted in his chest. The high output of the arc reactor has greatly augmented Stark's intelligence and provided him superhuman-level multitasking and learning capabilities. Unlike earlier armors, this new armor does not appear to rely on motors and servos for motion. Instead, the nano-machines create a secondary artificial musculature over Stark's body, upon which additional rigid structures are assembled. This also enables the armor to self-repair and be almost invulnerable, as the armor is capable of transforming and healing itself as long as the power output from the arc reactor is not interrupted or terminated; when the armor is briefly apparently destroyed in a fight with an alternate version of the Scarlet Witch, it is restored to normal after only a matter of seconds (although it remains inactive long enough to require Spider-Man to rescue Stark from plummeting to the ground). In the 2012 "Ends of the Earth" storyline, Doctor Octopus is able to disable the armor using technology derived from the armor of Iron Man 2020.