When Jason left the dungeon, he chose ten of the most wounded survivors to set camp there. While they would tend their wounds, they also would work on setting countermeasures against the slimes for when they return.
"Send a message to bring more than twenty survivors to help them," Jason said.
"Only twenty people to guard this place when the boss can leave the dungeon and attack?" Gustavo asked.
"He isn't that strong. With enough traps and a good strategy, then a group of that size can get rid of him," Jason said. "Besides, I don't think that he will come and risk getting weaker again. He will try to gather more resources to fight me in order not to become my minion."