I am working on a story that involves the main character being one of a few magical beings on the planet, who are born human but awaken to their powers at age 14. If killed the cycle repeats, and they are reborn, and all of their prior knowledge is gained when their powers awaken. The power here, in question, being extreme technological knowledge beyond standard human comprehension. He uses this knowledge to create weapons (melee style preferred) for protecting the planet.
In this case, the main character has died and is resurrecting. Due to circumstances during the resurrection period and the first 14 years of life, small areas of the planet have been taken over by some sort of Alien Force.
My character wants to help drive the forces off of the planet, but now in a new body, no where near as strong or battle hardened as his previous form, he fears even if he can move some of the heavier weapons(think large power gauntlets), he will simply be more of a hindrance than of any help.
He comes to the idea of enhancing himself with nano-technology.
What I am unsure of, however, comes down to whether nano-machines could be capable of the kind of strength increase wanted, or if this is outside of realm of even someone thousands of years ahead of humanity.