Global Cataclysm: I became a world tree

A fierce bird with a wingspan of [-] meters flew past from a high altitude.
The blood-colored creature walked and jumped between tall buildings, looking for prey.
The giant beast shrouded in thunder, every step it takes will shake the ground.
Human beings shivered in the ruins of the city, praying for the blessing of the sacred tree.
Outside the city, a giant tree covering the sky opened its eyes.
"This is my sheltered city. Get out, or die!"
In an instant, all beasts surrendered.
PS: Alien animal flow + leading the mainstream!
The main line in the early stage: subdue mutant animals and build forces.
In the middle and late stages, the protagonist can transform into a human being. ...