Thanks for the reaction! Yeah Magi can get really serious with the politics at times since they tend to discuss lots of issues like slavery and such. Hope you guys can bear with it since its part of the huge worldbuilding of the series aside from the Dungeons, Rukh, Magi & Magic.
About the Black Rukh it will be explained more later on but basically the default state of Rukh is white... so you can say that Judar is like a evil Magi but he can still use normal Rukh since the black ones are actually rare.
I kinda want to explain more but I'll stop myself for now.