The attributes of the zombies varied.
Some were physically immune, while others were energy immune.
Xiao Feng extended his right hand, and a surge of ice soul qi sprayed out.
At that moment, Xiao Feng was shocked to find that any zombie touched by the ice soul qi was completely frozen in place.
And according to the system's prompt, all these zombies were actually killed.
At this moment, Xiao Feng remembered that the ice soul qi could even freeze souls.
Although it belonged to the energy system attack, it also had a damaging effect on souls.
Seeing this, Xiao Feng excitedly shouted to the system, "Upgrade the ice soul qi to level ten!"
In the next moment, the ice soul qi , originally at level seven, soared directly to level ten.
The ice soul qi at level ten caused an even more powerful freezing effect.
Almost anything touched by it would be frozen.
