After finding the ocean. The main character would then stumble upon his ability to increase his domain into it. However, his domain barely entered the ocean having him wait until he grew more until he could expand his domain and keep enough power to protect it.

Unknowingly, during the time he went away, the world forest had an abnormal mental state. In that state, it would start yearning for something... the domain. This occurred due to being exposed to feeling the domain. The world stalk had been unaffected since it was born on it, but if the world stalk were to leave, it would feel the difference. Unlike before, the magic power is overflowing in the domain once the main character had awakened.

Making a big time skip, after uniting the entire continent, the main character would absorb the world forest as a branch of his existence, including the world stalk. Every race on the continent now believed in the divine tree as a sapling. However, on another continent, a religion made up of powerhouses was practiced. Adventuring to new lands to spread their religion, they head to the continent that the main character was on.

The difference of the religion was that the saplings were based on something currently existing, the other however was based on something exaggerated which had existed millions of years ago. People in power abused the religion creating a monarchy using teachings to brainwash the young into blindly believing them. Plainly, the continents went to war.

Winning against them, it went smooth for the next few years until the main character completed his goal of spreading roots throughout the entire world. In that time, a few seeds had planted themselves onto his domain but were easily eliminated once hostile. With that, he gained powerful plant companions to protect the planet.

As such, there was a reason seeds came to his planet though as it was being conquered by one existence, the origin tree. The planets it had conquered and powerful underlings it had were many.

Once the main character meets the origin tree, he clashes with him finally being able to bring peace. The origin tree reveals that he also has old memories of a past life... from thousands of years ago. He spread his roots throughout his world before, at first he was satisfied, but the boredom of watching things for 400 years was the limit. Finally realizing he can spread his domain further out, he started conquering other planets, witnessing new things, however, as time went on him conquering planets became faster and faster as his satisfaction couldn't be met. Entirely bored, having an almighty power, having nothing else... nothing moved its feeling anymore. His underlings were not his friends, they could not comfort him at all and he had no spirit that would contract with him.

As to how they would clash in space... by moving the planets itself. The main character by that time had reached a mature state, but that did not mean it would grow horribly huge that it would take up a 10th of a planet, he instead could control the size then.

Anyways, upon learning of the origin tree's pass, he also tells of his origin. Realizing it, the origin tree felt satisfied once more and requested the main character to take on all of its power... the main character accepted it. The great power he accepted was not as much as his, but he felt something he did not have before, being able to feel. It was a new ability that he could turn off an on.

The main character decided what to do with the planets the origin tree conquered, free them. There was no need to conquer anything anymore when the time arises he will protect them. Going back to his own world, the main character returns to a height of 5000 feet. His friends were around him. The years he spent in that world was something he never regretted. He was a tree standing on top of a hill... He was the tree protecting and nurturing nature... He was a tree... just a tree.