A different type of world tree

Liam hovered in the air as he stared in shock, amazement, and disbelief as he saw a clear demarcation line that ran right down the middle with nether abundant on one side and the other side devoid of any and all sorts of corruption.

It was surreal, a stark contrast that defied natural laws. On one side of the demarcation line, the nether's corrupting influence painted a scene of desolation. Dark, twisted landscapes, withering flora, and a sky that seemed to bleed shadows. 

On the other, the world was as he remembered it – clear skies, fresh air, and the vibrant colors of life.

This bizarre dichotomy made Liam's mind reel with questions. How had Earth managed to resist the nether's complete takeover and become like this? What force could have created such a clear boundary between corruption and purity?

It had to be the world tree sapling that he was linked to!