The knights of the holy queen are basically the guardians of the angel sanctuary on Prometheus. After the fall of the modern Prometheus. Angels started to come to Prometheus, they were seeking refuge from the demonic crusade. When demons invaded Prometheus for the angels only a small band of knights protected the angels. In return, the Angels gave the knights magic capabilities to battle the demons with. Soon the Knights had pushed back the demons, although weary and weak they kept their faith strong in the Angels and were rewarded woth blessings.
After the first demonic attack had subsided, more knights were recruited into the ones protecting the Angels, soon an army was formed and the Knights of the Holy Queens was formed. Soon a second attack of demons commenced causing the spark that became the Queen's Crusade, to stop the demons from destroying planet Prometheus.
Finally after 5 long bloody years of the Queen's Crusade, the demons were finally pushed back enough to where they were no longer an issue. But the demons did return, but they were weakened sustainability by the 5 year Queen's Crusade, and therefore easily conquered by the Knights of the Holy Queens.
Now, the Knights guard the sanctuary for the angels, for the Angels are their goddesses in everyway. The demons have not returned at this point but the knights still get the occasional dark necromancer, in which they have gained some resistance to the dark arts due to years of fighting the demons.
The knights are very adept in holy magic due to the angels bestowing the knowledge of these magics. As well as being very talented in the art of sword combat and taught in the ways of shiverly aswell as faith. They are excellent strategists but have trouble with controlling crowds of enemies due to the small numbers of knights (only 1000). Honestly if it weren't for the help of the Mavire kingdom and the angels the planet would have been overrun by demons. Also, when it comes to treating plague magics then it only goes so far. But curse magic is quite easy to banish to them.
The knights wear golden-colored armor with all sorts of religious symbols and emblems. But they aren't enchanted at all, only personal enchantments such as resilience to bonding magic and curse magic, they cannot cure all types of curse magic.