Things Like Folk Tales

Traditional Fantasy Novel, the Protagonist Seems to Have Something Similar to a Martial Spirit

The martial soul seems to be a pair of wings made of different types of weapons. Later, each weapon turns into a dragon soul. There seems to be a big sun sword technique in it. At the beginning, the protagonist is thrown into the underworld, but in the end, it is discovered that the world the protagonist is in is actually the world inside his body.