The Ship of Heroes site has been updated with a new blog post that looks at how nanites serve the game community in both mundane and more exotic ways, including in combat, in this case in the form of "counter-nanites" for defensive purposes.
Counter-nanites can easily draw on a person’s energy reserves – or even the ship’s generators – to strengthen their defense, so it is also impractical to try to overpower them. They scan and identify all other nanites, and shut down unknown ones unless the person being affected gives permission; usually only healing and buffing effects are allowed, and even those cannot be used too much without straining a person’s systems. Those who apply such beneficial nanites in combat often end up eating more than three meals a day to supply extra energy to them, which some find to be a pleasant side-effect.
Check out the full blog post on the Ship of Heroes site.