"Sir, I tried to control the mind of those Monsters and surprisingly I found the last memory of those Monsters. Every one of those Monsters is naturally Monsters from the danger zone and previously when they roamed around the danger zone they somehow saw a bright light and after that, they did not have any kind of memory present in their mind.
Most likely like those Warriors, these Monsters also get kidnapped by the Abyss humans. Most likely they wanted to experiment on those monsters to see if they could turn these monsters into more dangerous Monsters or not.
The thing I found common in these Monsters like those dark humans, is that they also have that weird spiritual energy present inside of their body and also they have a weird symbol present on their forehead. So naturally these monsters also became puppets as you told me earlier and without getting the order from their master they will not do anything.