Molly said, "Green Feather encountered significant difficulties while attempting to break through to the Law Enforcer level and had to resort to using the Invisible Holy Grail."

The "Holy Grail" is a type of mystical artifact that, through special processing, can achieve various miracles and is a powerful item.

The foundation of the royal city, the Fire Grail, is an item that realizes the miracle of fire.

Besides the Fire Grail, there are also the Invisible Holy Grail, the Soul Grail, the Hunter Grail, and others.