@AkiTooru , @Acolytus - have you noticed that in this setting, demons and magic are closely connected (with demons being a lifeform overflowing with magic)? That's why it makes perfect sense that they would share a root in the setting's language too.
It is bad enough that Shin is teaching all those other kids his advanced ways of using magic... but portal magic is crossing a line.
Luckily he isn't imaginative enough to figure out how to make it REALLY fuckin dangerous.
On the other hand, anyone who has read Schlock Mercenary knows what I mean when I say "Long-gunner of the Apocalypse".
Hmm, gate magic is fun tool. Just build and vacuum tight chamber, set gate between it and space. Then at the top and bottom set a gate pair. Drop suitable mass inside, let it reach near light speed. Handy kinetic weapon...