After collecting enough information and Robert's okay to proceed, we practice opening small portals not too far from Fortress.
As a result, beasts and shadows crawl here from the nearby wildlands. No one goes out anymore, but that's not a big deal.
They'll travel once everything is over.
Now, we have an infested forest around the city, and no refugees dare to come to our door.
Still, the portals work. They last a few seconds only before disappearing, but it's enough for four or five demons to cross.
I'm not even on alert anymore since they don't attack Julia. They just ignore me most of the time and run to be petted. I keep some distance not to alert them.
I also observe the energies and record everything with a device Amadeus gave me.
After doing it four times, they don't even care anymore about the recordings. They have their information, so Julia and I focus on this part of the training.