If an outsider were to hear Corey's thoughts on how good and satisfying the battle against Eidolon had been, they would call Corey a mad man.
And he would not deny it.
Battling Eidolon was a good thing for him because it brought him back to reality.
He was not humbled by Eidolon, and majority of his injuries were literally self-inflected, caused by his usage of so much mana at once.
Eidolon was not extremely strong to the point where it could overpower and overwhelm him, but it was dangerous... dangerous enough for his instincts to warn him of its threat.
And Corey was grateful for this.
Although he had never said it out loud, he knew that he had been getting overconfident and filled with less wariness at the possible dangers of New Earth.
Especially after his recent upgrades in Trollspire Dungeon.
He could battle Tier 6s, even some talented Tier 6s, and on New Earth... how many Tier 6s could there be on New Earth?