Caleb's trial; the covenant of Hell's Key

After conquering Demon's Tower at Hell Mode, Caleb got the least personal rewards since he was the only one in the group to not get at least an S-ranked unique skill, only getting an A-ranked one.

As if to compensate for this, among the drop rewards that they got after defeating Asmodeus, the King of Hell, there was an S-Ranked item that fit Caleb's class, Hell's Key.

Till date since getting the overpowered item, Caleb only used it in dungeons where others were not watching.

He didn't even use it during the battle of the Canyon of Ruins.

This was because unlike the others who recklessly revealed their unique skills and trump cards, Caleb calculated ahead for their debut in the pro scene. A trump card becomes half of a trump card once the whole world knows about it.

This was why he kept Hell's Key a secret, and now, it was time to level it up.

The moment Caleb activated the level-up test for Hell's Key, the world shattered around him.