Back during the glorious days of the Nostic sect, the Pope had expended vast human and material resources to set up three altars in three hidden locations. However, before they could be successfully activated, the Spiritual Energy had completely declined, leading to the downfall of the sect.
Fire Eagle Nest was one of them. There was an attempt to sacrifice Old Gu, but it was thwarted by an ingenious move, turning the tables on them. Since the altar was used once, it could not be used again in the short term, thus leaving two more.
From the information compiled by Erhard, there were only descriptions about the functions of the altars, without exact locations.
Through Xiaojin's analysis, since Nostic intended to distract The Kingdom of Jushi, one of the altars must be related to or close to it, so they were worried about interference.