He hasn't gone crazy. Instead of spending a few years here to clear a battlefield's ruins, he might as well cultivate the 'Heavenly Human Technique' to enhance his own strength.
However, another method intrigued him greatly, which was utilizing the effect of the 'Sanmei Divine Wind' divine skill.
Although 'Sanmei Divine Wind' isn't specifically for energy cleansing, removing all energies within its range is just an insignificant ability it possesses.
But here, the 'Sanmei Divine Wind' could achieve the best effect.
Of course, compared to eliminating surface residual energy, clearing the residual energy that has seeped into the subsurface using the 'Sanmei Divine Wind' is the most troublesome.
However, as long as he mobilizes 191 brains, with the help of IBMz15, and uses the 'Sanmei Divine Wind' to sweep back and forth at the polluted depths beneath the surface a few times, he can clean up the subsurface pollution.
