Stark and Yinsen secretly build a powerful electric generator called an arc reactor to power Stark's electromagnet and then begin to secretly build a suit of armor to be powered by the reactor and utilized as a means of escape. Although they keep the suit hidden almost to completion, the Ten Rings attack the workshop when they discover their intentions. Yinsen sacrifices himself to divert them while the suit powers up. The armored Stark battles his way out of the cave to find the dying Yinsen, then in anger burns the Ten Rings weapons and flies away, crashing in the desert and destroying the suit. After being rescued by Rhodes, Stark returns home and announces that his company will no longer manufacture weapons. Obadiah Stane, his father's old partner and the company's manager, advises Stark that this may ruin Stark Industries and his father's legacy. In his home workshop, Stark builds an improved version of his suit, as well as a more powerful arc reactor for his chest. Personal assistant Pepper Potts places the original reactor inside a small glass showcase. Though Stane requests details, Stark keeps his work to himself.