Become the Ancestor of Beasts at the Beginning, and I Will Lead All Beasts to Resist the Aliens

[Rebirth + System + Invincible Cool Text + Decisive Killing + Multi-dimensionality] A thousand years ago, changes occurred in the land of China, and an energy appeared in the air. Monsters are rampant and alien races appear. Human beings rely on these energies to continuously make breakthroughs and ultimately survive. A thousand years later, when the strongest alien race is about to appear. Chen Yan accidentally traveled to this world. [Ding, congratulations to the host for binding the beast ancestor system] Each upgrade comes with one more ancient beast. What? Not strong enough? Then evolve! After a few years, all the beasts gathered together. What beast tide? Those are my army of beasts. Alien? Not enough for my little brother.