I could tell at once by making it fight, this skeleton has the skill of a true knight, complete with the robust defense of the kite shield, and the furious waves and slashes let out by its saber, I can only say that it has brilliant movements.
The Black Skeleton Knight was resistant to slashing abilities, and fatigue, because of this it is well suited for drawn out conflict.
Even against the elves there was no major difference in skill, but in the end it lost to a difference in physical strength.
Yeah, this guy isn't usable.