Aka Longevity Lamp. It was found in the Qiankun Tomb.
Not only was the inside not black, it was contrarily relatively brightly lit; these Longevity Lanterns were without odor or flicker. Reportedly, if a particular type of Demon Beast’s oil was taken from the ten thousand li of seabed, it could burn for a thousand years without going out. For this reason, it was called the “Thousand Year Lamp,” and it could be seen how imposing the Four Styles School previously was.