That's why Ye Tianfan and his team are so wary of these two wall-external creatures.
After all, if something goes wrong, the ones who die will be their people.
One must know, if a wall-external creature truly wants to infect, it is enough to infect the entire interior wall, as long as it is not controlled, so it is conceivable how easily a wall-external creature can multiply.
However, for a human to cultivate to their level, it takes a long time, so sacrificing any one person would cause irreversible damage to them, because training another person requires consuming a large amount of resources and abundant time.
This is why, despite the abundance of wall-external creatures, the powerful cultivators are gradually becoming fewer.
