Nanoreparoids are enhanced nanites with emphasis on repair. Basically, they are enhanced microlite constructors with an emphasis on repair, making them essentially microscopic multitools. They are capable of self replication, and replication of building materials, such as Xentronium, depending on how much power they get. They are normally powered by a small fusion battery, however, they have the ability to take power from their surroundings and augment their repair abilities.
Their replication system also allows them to replicate themselves, meaning that they can swarm the repaired area, and then convert themselves into the building materials where they need to be, making them incredibly efficient when it comes to repair. They are usually seen in hull supports, or other critical areas of the ship, and are increasingly being mounted in armor, so that the ship can repair its armor mid-battle.