The Abyss Watchers

The Abyss Watchers are a legion of troops that all wear the same outfit consisting of leather armor over chain mail, a long cloak, and distinctive, pointed helm that was their signature. They also have iron kneecaps due to their unique sword techniques.
All of them use a great sword and a crooked dagger. The dagger is not primarily used for offense, or even parrying, but instead as a fulcrum for the Watchers to utilize their wild, unpredictable fighting style.