I made a mistake in the previous chapter and also in Corey's status screen about his level. His level is not 202 or 256, it's in the 400s.
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Corey observed his Cosmic Soul after it successfully refined the soul energy of Orpheus.
He saw that the cracks on the egg-like shell increased, and when he saw no other change, he shifted his attention away from his Cosmic Soul.
Increasing his level from 402 to 456 might seem like a massive improvement, and it actually was. However, one should not forget that Orpheus was a Tier 5, which meant that he had absorbed the soul energy of a Tier 5 as a newly ascended Tier 3.
The difference between Tier 3 and Tier 4 was massive, and the difference between Tier 3 and Tier 5 was indescribable.
To better understand how massive the difference was, one just had to understand the levels that each Tier comprised of.
To advance to Tier 1, a Tier 0 had to reach level 100.
To advance to Tier 2, a Tier 1 had to reach level 200.