Just a few tips to help you develop this further, and provide some questions for you to brainstorm. I like the weapon, it is nice, and unique, and I see why you are willing to work for it. :]
If the Cmokan warriors have died out, then how would one know the fighting style? I am assuming it is passed down somehow, to someone outside of the 'clan' or whatnot, but then that person would have to know about these warriors, wouldn't they? It is just too vague to say they died out, and then justify not having to write a detailed article on them, when people exist out in this world that may know their fighting style, as well as possess their weapons. What if someone goes out exploring for more information on these warriors, these people? They will need that lore in order to roleplay it. I know it can be a pain, but almost everything has to be explained when it comes to these things. It isn't too many questions to answer, really. Where were they located? Why did they die out? Were they just a sub-race/clan of humans? What were they like?
Even NPCs have to be detailed, as anyone in this world could interact with them if they choose, and they need to be able to do that.
Also, if the Cmokans go extinct, like you mentioned doing, then where would you get this weapon? In a store? 100 gold mizas isn't actually all that much money. A katana sells for that.
I don't mean to sound harsh, I really don't. I might just be bad at offering critique, and these are just some questions and comments I felt might help you out. If you really want to see this through, I wouldn't mind just continuing to point out little things here and there, if it doesn't bother you.
It would be much easier to fit it into the existing lore though, if you want to jump right in. Perhaps a discontinued weapon created by the roaming horsemen clans of the
Drykas?