Qin Yun naturally needed to choose the wooden sculpture that allowed him to dream a hundred years. As for the Eye of Lightning, Qin Yun temporarily put it aside for his wife. After all, such a divine power was truly rare, allowing one to identify human from a demon, or the light shined upon a person by providence or treasure auras. It was similar in effect to the Heavenly Eye divine power. However, it was not necessary for Qin Yun. The weakening of the lightning tribulations from the heavenly punishments was only useful if he managed to defy the heavens and create an Essence Soul Dharmic formulation. If not, the tribulation would not happen to him at all. As for using it to supplement him in battle? It was certainly useful but he still trusted his flying sword the most.
He might as well take it regardless. After all, it was a divine power that ranked highly in the world.