Taoist Cundi was one of the most mysterious and ancient Celestial Immortals. His death was seriously against the natural order of things. It was futile to think he could be resurrected. For a living being at Cundi's level, resurrection not only involved re-awakening of the spirit, but also required a recovery of the physical body. Only then could he achieve true immortality and restore himself to his peak form. If he could not, then he would not have the same level of strength when fighting with his enemies, even if he was fully resurrected. So he went into hiding.
While preparing for his resurrection, Cundi wanted to restore a part of the strength he had before. This decision that made him feel somewhat desperate, but he had never thought that he only needed to wait five eras for this opportunity to arrive.