Here was the summary what Ethan learned from them: A person went to the awakening center, which was somewhat similar to the martial core awakening and talent awakening process.
But here, this process happened at the age of 15, whereas the martial core awakening usually occurred at 18.
Moreover, these people didn't cultivate. Or more precisely, they simply couldn't. Ethan didn't feel even an ounce of cosmic energy in the air. They killed monsters from the dungeons, and by doing so, they gained experience and leveled up.
Level 1–10: E rank
Level 11–20: D rank
Level 21–30: C rank
Level 31–40: B rank
Level 41–50: A rank
Level 51–60: S rank
Level 61–70: SS rank
Level 71–80: SSS rank
Level 81–90: X rank
Level 91–100: Transcended rank
This was the known information, but these people had never even heard of anyone above S rank.