A Powerful Unevolved Spirit Beast

Even though it was believed that all the regions of the Floating Island were side by side without any gap between them, this was not true.

From a microscopic geography, these regions have some dense forests in which many unevolved spirit beasts live.

These unevolved spirit beasts didn't have a high intelligence and only flowed their primitive instincts which were to fight, devour and become stronger.

Due to these instincts, after who knows how many years, the unevolved spirit beasts at the top of the food chain became so powerful to the point where they could fight with the rulers of the different regions of the Floating Island.

Of course, with the huge gap in intelligence, the rulers would have a clear advantage and would eventually win with their battle tactics.