Reign and the others continued climbing up, they had come across multiple groups of monsters that were controlled like the first one. The main difference between the new groups they encountered was the fact that they were lower in numbers compared to the first one.
Almost all of the groups had only about half of the initial group's numbers and they were easier to deal with. Well, at least at the beginning. The higher Reign and the others climbed, the stronger the monsters became and sometimes the control the enemy had over them was better as well.
The control depended on the monsters, the ones that had higher willpower and perhaps spirit stat were harder to control, at least that's what the team figured since it made the most sense. Some groups were harder to deal with, while others were relatively easy.