The Thirty-Sixth Layer of Heaven, a rather central area.
Before Lin Yun broke through from the Thirty-Seventh Layer of Heaven to the Forty-First, this place was definitely one of the top cultivation sites in the entire Netherworld, but after Lin Yun broke through those layers, this training ground became less significant.
Lin Yun allowed some Ghost Practitioners who sold treasures that could help the Tri-Eyed Emperor exert the Divine Eye Ability to train from the Thirty-Seventh to the Thirty-Ninth Layer of Heaven, but there were some who couldn't obtain these treasures or whose treasures were not of high enough level, so they could only cultivate in the Thirty-Sixth Layer of Heaven.
Emperor Wu and Emperor Proud were among them, not because they hadn't sold any such treasures, but because the ones they sold were not of high enough level.
