The Hero Altar was built on a balcony on the rooftop. It was open-air and the altar had a giant statue of an armored man that looked a lot like the imitation of God of Hope.
Following Peniel's instruction, Jack went to the base of this statue. An interface opened up. There were several options there. One of them was to issue a challenge to an inmate.
"Seeing that there are multiple options, does it mean that there is more than one way to recruit a hero?" Jack asked.
"Yes. You can also offer your companion to be a guild hero. But normally no one does that unless they get a better companion offer. If you have a Hero Token, you can also use it on this altar. It will summon a random hero, the grade will correspond to the rarity of the token."
Jack clicked on the challenge option. An energy wave radiated out and Jack was surprised to find himself in an isolated dimension. It was a space similar to when he did his Blade Dancer trial.
