'It seems I'll have to take a trip to the Underworld if I want to obtain this Reincarnation Pool.'
'The Underworld must have been formed from Zhao Yin's Grotto Heaven. His core consciousness is hidden within.'
According to Zhao Yin's memories, Wang Xiao already knew that for a Tier Six Life to refine a planet, they had to do more than just condense a Dao Fruit. They also had to fuse their Inner World and Purple Mansion Heaven and Earth to form a Grotto Heaven, then use it to slowly merge with the planet's consciousness.
This was the step where Zhao Yin had encountered a problem, causing his attempt to refine the planet to fail.
Left with no other choice, he could only transform his Grotto Heaven into the Underworld and use the Curiosity known as the Reincarnation Pool to absorb the spirits of this world and reincarnate them into the mortal realm.
Under normal circumstances, entering another person's Grotto Heaven would be like putting yourself at their mercy.
