In the information panel of the zombie, there is an extra progress bar, which is increasing slightly as it eats.

Whether this progress bar is about upgrading, Xie Zhi is not sure, because ordinary subordinate zombies have never had any chance to fight, it is purely the existence of porters, and it is the fighting plants they carry on their backs that actually fight.

It's just that the eating of one subordinate zombie was too slow, so Xie Zhi simply recruited nine more to make a whole, and the ten heads gnawed together.

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