Before long, what Wu Chengyue and Xiao Licheng worried about really happened.
About half a month after Xie Dong and his men destroyed the three-thousand-men troop from Sky Fire Base, five seven-meters-wide holes appeared near the area that Yun Meng's regiment was stationed in after dusk, before it was completely dark.
Yun Meng and her zombie soldiers instantly sensed a strong earthy smell from that area coming from a few different directions. So, she immediately brought a few zombie kings and queens to that area and found more than one hole.
No sound could be heard from those holes as countless underground creatures that were at the size of mature gorillas silently crawled out of the ground. Hundreds of them were already standing near the holes.
