Cau

Ohh you´re right! I didnt notice it was Naksu´s Sword. Half White, Half Black. But why Uk is using it? Do all great Mages uses the same color? I look for some images and the Crown Prince´s is White/gold, but i couldnt see the completed image. The Jin´s Daughter one is red. Park Jin is black, Jang Kang is black (father). Could it be the same color for the same clan? So, again, why is Uk using Naksu´s sword??

I dont know if its related or even if its significant but in the poster we also can see Uk is holding a White/gold Sword instead of the Black one from his father.