Kyoukai Senjou no Horizon - Volume 8A, Chapter 27: Visitor at the Waking Point

“My name is Yang Jian, when you are reading this, I am already dead.”A mysterious sheepskin scroll, an eye that peers into darkness, this is the tale of a survivor

Crossing the Douluo Continent, or an auxiliary spirit master?

Su Xun decided to exercise his body first.

Thirteen years later, Su Xun is out!

Star Dou Great Forest…

“Golden Eagle, the white feathered peregrine falcon killed your wife, I’m here to help you get revenge, you fight, I’ll support you!”

An hour later, the uninjured Su Xun took away the dying white-feathered peregrine falcon.

Battlefield…

“I saw that Xiongtai’s brows were fighting against the air of black and yellow. It must be extraordinary. I don’t know if you can make friends?”

Su Xun stretched out his hands of friendship.

Thirty seconds later, looking at the opponent whose body was filled with black energy, Su Xun turned aside:

“Referee, you should speak up, or he will be poisoned to death!”

- Description from novelbuddy

This is a reincarnation/isekai story, about Matt (later TreeTree), an overpowered tree in a fantasy world that serves as the battlefield for an ongoing conflict between demons and the heroes summoned to oppose them.At first a bystander, over a long period of time, TreeTree will learn all sorts of skills, gain levels, and in doing so, build up a forest, train young subordinates, protect a village, and more.