That was over three thousand years ago.
Different tribes, growing stronger, erupted into a war that swept across the entire planet due to the distribution of resources, causing great destruction to nature. At that time, the dozen strongest priests believed that this would inevitably incur nature's punishment. Hence, after exhausting hundreds of years and rallying one powerful priest after another, they created the Life Mother Tree at the cost of their own lives.
After that, every powerful priest, at the end of their life, would integrate their soul into the Life Mother Tree, merging with it and also making it even more powerful.
Three thousand years later, today, the existence of the Life Mother Tree had long enveloped the whole world, its roots ubiquitous, and "Senya" had become the common name for all tribes and all species.
Throughout the lengthy years, the Life Mother Tree also became the faith of the Senya people.