What happened here gave me an insight about something. If these portals were controlled by someone, then I'd force him to close every single one of them.
And during doing this, I'd end up gaining a much larger force that would leave me invincible by the end of this quest.
As such I moved at my highest speed towards the east. Starting from this place, my territory expanded into every direction. But as I recalled, there were lots of towns and cities in the eastern region.
The plan to increase my monster army and close the portals started officially right now.
Moving around towards a nearby portal didn't take much time. Also the monsters down below weren't that slow. They just had a lag of ten minutes or so to arrive at my chariot after stopping at the next town or a city.
The only drawback here was the inability of me to take them into my inventory. Like this I had to scatter them around, and wouldn't truly depend on their help if I ever needed them.