``` [A normal Immortal City Grand Formation was primarily used to defend against external threats.]
[It could also suppress threats within the city.]
[Of the two functions, however, defending against external threats was naturally more important.]
[After all, the Immortal City Grand Formation was also called the Immortal City Defensive Grand Formation. Its original purpose was to withstand attacks from outside.]
[The same principle applied to the sect-protecting formations of many sects and other factions.]
[Yet Azure Moon True Person had instructed the Formation Masters of the Formation Hall to strengthen the grand formation's internal suppression and lockdown capabilities?]
[What did that mean?]
[With the grand formation's overall power fixed, strengthening internal suppression and lockdown meant weakening its external defenses.]
[What was the meaning of this?]
[Was the enemy within?]
[You did not quite understand Azure Moon True Person's actions.]
[You even began to speculate with the worst possible intentions in mind.]
["My dear Wang... don't overthink it..." Shen Lingxiu gave you a reproachful look. "The city lord did this to prepare for the auction fifteen years from now."]
["The auction fifteen years from now?"]
[You looked at Shen Lingxiu.]
["Fifteen years from now will mark exactly three hundred years since Azure Moon Immortal City was founded. The city lord will hold an enormous auction then, offering many rare third-tier resources for bidding."]
["Apparently, there will even be quite a few Core Formation Treasures. There might even be a Crystal Condensation Pill..."]
[Shen Lingxiu blinked her beautiful eyes and spoke as she looked at you.]
["A great many cultivators will certainly attend, including quite a few True Persons. That's why the city lord strengthened the grand formation's internal suppression and lockdown capabilities-to prevent True Persons from stirring up trouble inside the city..."]
[Shen Lingxiu spoke in a soft, melting voice.]