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Since even the slightest infection by evil energy leads to the transformation into a corpse, the Daoist priests who guard the righteous tombs of the cultivation families day and night must, of course, be more powerful than mere Golden Core cultivators; they have to be at least of the Nascent Soul Stage.
This Master Liang was such a worldly guardian, an upstanding priest of the Louguan Dao, not part of the mountain faction but instead a direct disciple seated below the leader of the observatory.