On his first day, when Wain came to this world through the portal fleeing from the black mist, he immediately encountered the guardian of this dimension.
With the help of his world's residual essence, Wain could defeat a seemingly invincible foe. However, his difficulties did not end there. He faced a battle with this world, or rather with its essence.
The world couldn't fight like Wain. It could condense its energy into the essence and unleash its power on Wain. Otherwise, the world would have been destroyed, for, unlike matter, energy was not material.
Thanks to the remnants of his world's power and the essence of his soul, Wain could overpower the world's essence. It could not be called a real fight. In that case, this space would no longer exist, nor would the planet.