What is the official path of Arelius clan? And what are its basic principles?
That's an interesting question. So, the official path of the Arelius clan.
The Arelius family in the Blackflame Empire does not have an official path. They don't have one; the elders are all on different paths. I mean they really do a lot of different stuff. They usually use their different paths to create links and bonds--kind of like arranged marriages between the different sects and schools of the empire. The path that Cassius is on, the Path of Silver Grace, the School of Silver Grace is actually an influential and prestigious school in the Blackflame Empire. Therefore, they send qualified people there from the Arelius Family in order to create bonds. So, really, it's their people in different sects and schools all over the empire.
However, as has been alluded to for the last few books, there is a homeland continent the Arelius family come from and they have a main clan there. That clan does indeed have an official path but I'm not going to share it with you yet because I think it's going to come into play in book seven. Books seven and eight, so it's at least going to be featured in it. I don't know how prominent it's going to be so that's not as much of a spoiler as it sounds like.