What's the use of sword coins in misty rain Jianghu?

So far, it has no effect. You can get it through the task of feeding dogs in Luoyang, but it must be a prop of the branch line in the future. Don't lose it, just like the jade cup, otherwise it will cost a lot of money. Such a task will be posted here in the future, and you can do it then. I went to search the nest of Raiders' nest Raiders and used knife coins to do the task.