The battle between Beasts and Humans was in a state of stalemate. In the last few battles where they clashed, both the human side and the beast side suffered minimum damage. Not only that but the beast side also suddenly gained two more beast sovereigns which had restored the balance between two sides and that's why the beasts were not very willing to attack the humans again.
Meanwhile, both in the human and the beast camp many new things were introduced that belonged to the opposite camp. But those new things were either extremely entertaining or very useful, so both sides liked them a lot. In that way, a shift of opinion was visible.
Then suddenly both the top tier heroes and the beast sovereigns started to notice that spatial fluctuations suddenly started to appear in various places. They also started to feel some sort of unease that was directly targeting their soul.