0_Eclipse_0
I think I understand :: A swordsmanship realm is The " will of a swordsman " Which shapes haki into a concept (Red aura of mc) but it can only be refined unlike haki(Observation Armament Conquer) where you need training, experience or body training to make haki powerful A swordsmanship realm is the manifestation of haki through pure swordsmanship into a concept (Dragon twistor etc etc) but this realms can only be achieved by understanding the sword, becoming a sword and Refining sword techniques to peak(no flaw, no delay, opening, weakness) etc.