Quote Originally Posted by DarthEnderX View Post
Rukh seem to be made of Magoi, or they carry it at least.
They seem quite interchangeable, but only the magi seem to be able to collect rukh from air and use it for magic like normal magicians use their inborn magoi. Based on this episode it seems like Magnostadt is able to collect rukh as well, even if they need some fancy constructions and magical tools for it.

I guess magic (mana) is magoi when it's inside an organism and rukh when it's freely outside.