C302 It soared 352 spiritual energy!

Why did killing a zombie give me the chance to level up?

The white small light bulb flew out of the zombie's body after killing it.

The sudden emergence of a biological crisis, species of evolution, levelling up, all of this seemed to have been planned ahead of time. What exactly is this' species of evolution '? Are there any side effects to the body? Dammit, I'm about to leave Earth