I think it's some sort of nanotech. Stark keeps it in the hollows of his bones that were made to keep his inner armor (the gold stuff that covered his skin when he wore extremis). It's probably just as powerful as extremis, but I doubt he gets benefits such as technomancy, healing factor. Wikipedia calls it "The Bleeding Edge". Don't know where they found the name though.
Although, I could see it as being weaker than extremis. I think extremis was overpowered.
I wonder if he has enhanced strength, healing factor, etc. now. Stark mentioned that his new arc reactor fuels his body and brain, enhancing his intelligence. Maybe it enhances his body too?
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