Reaching A Pinnacle

The object that emerged wasn't the Divine Sword.

Adonis still couldn't afford to use that unless absolutely necessary. It wasn't out of selfishness, but out of consideration for the grander scheme of things that would come into play if they all managed to survive here.

However, the item that floated atop Adonis' palm was just as priceless.

'The Unknown Box…'

It had the power to bring forth the full potential of a Skill, without any drawbacks, for a limited amount of time.

Since the effects were only temporary—perhaps five to ten minutes—and could only be used by its user once a day, it wasn't an invincible treasure.

However, The Unknown Box also granted this full-potential Skill's usage without the cost of a single ounce of Mana.

That meant, within those five to ten minutes, whatever Skill the user chose would cost no Mana at all. 

As such, while not invincible in itself, the box granted invincible power.