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Reiger knew that Ye·Lantern was already being watched by others.
There was a Magic Singer who controlled the undead, scheming in the shadows to turn Ye·Lantern into a city of the dead, and to turn its inhabitants into the undead.
Once Ye·Lantern became a city filled with the undead, that city would surely give rise to more and stronger undead creatures.
The Magic Singer who controlled the undead planned to use the power of a ritual to transform himself into a wise, high-ranking undead who would never age or die within this soon-to-be city of the dead.
For this purpose, the other party was preparing in the graveyards of Ye·Lantern, using the environment of the gravesites and the power of a magical artifact in their possession to secretly create and summon as many undead as possible, amassing an army of the undead.