When Rowan created the Origin Realms, he knew that Eos would never shatter them despite having the constitution to survive without depending on the powers of Will or the higher-dimensional power system.
The dimensions were separated from the power of End, but after Existence's repeated destruction and rebirth, End had tied itself to every negative and destructive force within Existence.
With a firm foothold over destruction, death, and the essence of Evil itself, the power of End began to infect even mundane essences, such as space and time, ensuring that every part of Existence would become part of it. With this method, End would assimilate Origin and destroy it entirely.
This was the ultimate reason for the destruction of everything he knew and loved. End wanted to shatter Origin, and he was just the last bit of resistance standing in front of Origin, the last light that would ensure that life was not lost forever.
