According to the Bible, in the Seven Day War with Satan, Michael fought to defend God's right to rule against God's adversary and eventually defeated him. In Christian paintings and sculptures, Michael often appears as a young boy with long blond hair, holding a red cross (or red cross-shaped sword) and fighting a dragon, standing on the dragon or becoming friends with the dragon, in this case Satan.
You get the Judgment Longsword, which is the most important weapon given to Hades.
If you're reday here is the Time Door