Little Qi
After all, it was just my own theory about the reason behind all this. Who knew, there might be a totally different theory behind such changes.
"It works fine for us," I shrugged, "we got lots of forces to train, and they kept getting stronger fast. So if they were acting like what normal monster dens should, I doubt this will satisfy the needs of my forces."
I wasn't making up excuses, as this was the bare truth. I got tens of millions each day, and part of them would be used as fighters while the rest would live in the towns and cities, helping do other stuff here.
If we didn't have such scary monster growth here, I doubted even the first training ground would be enough for half of my current army.
Besides, having the chance for these monsters to evolve was great as well. It would add new variables for my soldiers, just as if they were facing different enemies each time.