Help with possible problems or questions about my magic system

I think it's hard to answer this without understanding more about what you already know about the system, and what exactly you're asking for help with. I don't think you spelled out your system enough to find a problem with it. It sounds like a good general setup for conflict. Personally I think the name "Spirit Walkers" sounds more earthy than pretentious, but maybe paired with the abilities of your system it makes sense. If you haven't already mapped out the basics, that's a good place to start - even if it isn't spelled out in your book, even if the characters don't actually know, you as the author should know how the magic works. Where does it come from? How is it channeled? What are the limits? What are the costs and drawbacks? Setting limits is really important, without that your reader won't know what the stakes and dangers are to your characters. It also creates a place to advance from. For example, if magic doesn't allow for healing anything more than a paper cut, then when your character is faced with physical harm the reader knows to be worried for them. And then if your mage discovers how to heal serious wounds, the reader understands it's a major accomplishment. Also what can your magic do? If it's, say, elemental magic, then it makes sense to throw fire and lightning, but maybe not as much sense to stop time. Although of course you can do anything you want! Then you would set up how much your 2 factions each can do, and if they have different methods or abilities. Example being, maybe your pretentious faction knows how to do more illusion magic because they focus so much on fooling people. Also, if your magic system is "soft" you don't have to lay out a lot of rules. But maybe once you've set up the parameters, it can inform your story and plot choices. You may have already figured all this out, but maybe this gives you something to think about!

 

You can review some older French titles, both for people and for awards and such as inspiration.

Create a word list. For each of your keywords, generate a list of similar words.

Highest, Royal, Enlightened
Order, Society, Magistrate, Council, Court
Most, Complete, Authoritative
Sacred, Hidden, Obscure
Spirit, Aether, Mystical
Bridge, Gate

From this list, randomly (or sequentially) generate a list of potential names.
Using a quite program that I wrote, I get over 800 possible permutations:

1 : The Highest Most Order of the Sacred Spirit Bridge
2 : The Highest Most Order of the Sacred Spirit Gate
3 : The Highest Most Order of the Sacred Aether Bridge
4 : The Highest Most Order of the Sacred Aether Gate
5 : The Highest Most Order of the Sacred Mystical Bridge
6 : The Highest Most Order of the Sacred Mystical Gate
7 : The Highest Most Order of the Hidden Spirit Bridge
8 : The Highest Most Order of the Hidden Spirit Gate
9 : The Highest Most Order of the Hidden Aether Bridge
10 : The Highest Most Order of the Hidden Aether Gate
(...)
801 : The Enlightened Authoritative Court of the Hidden Aether Bridge
802 : The Enlightened Authoritative Court of the Hidden Aether Gate
803 : The Enlightened Authoritative Court of the Hidden Mystical Bridge
804 : The Enlightened Authoritative Court of the Hidden Mystical Gate
805 : The Enlightened Authoritative Court of the Obscure Spirit Bridge
806 : The Enlightened Authoritative Court of the Obscure Spirit Gate
807 : The Enlightened Authoritative Court of the Obscure Aether Bridge
808 : The Enlightened Authoritative Court of the Obscure Aether Gate
809 : The Enlightened Authoritative Court of the Obscure Mystical Bridge
810 : The Enlightened Authoritative Court of the Obscure Mystical Gate

Code:

import random

#- Lists
list1 = ['Highest', 'Royal', 'Enlightened'];
list2 = ['Most', 'Complete', 'Authoritative'];
list3 = ['Order', 'Society', 'Magistrate', 'Council', 'Court'];
list4 = ['Sacred', 'Hidden', 'Obscure'];
list5 = ['Spirit', 'Aether', 'Mystical'];
list6 = ['Bridge', 'Gate'];


#- MAIN
line_counter = 1

for item1 in list1:
    for item2 in list2:
        for item3 in list3:
            for item4 in list4:
                for item5 in list5:
                    for item6 in list6:
                        print ( line_counter, ":", "The", item1, item2, item3, "of the", item4, item5, item6 )
                        line_counter += 1

Enjoy! ABR

 

I think that one common pitfall in stories about 2 cultures coming together is basing them on real-world examples that are stereotyped or prejudiced. If you do use identifiable real-world inspiration, it's probably a good idea to do some research and talk to people from that culture to make sure you avoid issues - then have a diversity reader check it. Another one would be making 1 side "good" and one side "bad", and your character from the "good" culture saves the bad one. Societies are complex, as are the people in them (although of course if you're writing a good vs. evil story there is a place for things like trollocs and goblins!)