A Thatched Roof from the Start, Evolving into a Divine Toilet

The protagonist starts out as a thatched hut. To grow stronger quickly, he takes an unconventional path and evolves into a toilet, attracting powerful humans to use him and absorbing vast amounts of negative energy as he constantly levels up. In the end, he becomes the "Number One Toilet of the Myriad Worlds," so luxurious that even Immortal Emperors have to queue for it, and infused with the laws of reincarnation. With it, he takes control of the cycle of reincarnation across the Myriad Worlds.