The *Body Corrosion* Secret Technique stated that one must use Wood Spirit Qi to nourish a spiritual target—the soul of the Lizard Demon. This soul would then act as a medium to absorb Spiritual Qi until the Lizard Demon's spirituality manifested within one's own Spirit Veins.
So, if he switched to the 'Purgatory Banner', he would need to have 'Nether Water' drive the Lizard Demon's soul to use the 'Purgatory Banner' and absorb Nether Qi, until the Lizard Demon's spirituality manifested within the 'Purgatory Banner's' internal Array.
In theory, this approach seemed viable. However, Nether Qi and Wood Spirit Qi were vastly different. Wang Ping was merely using his current cultivation experience to test a hypothesis. Whether it would succeed was up to fate.
