Xuan Wu is the legendary and one and only god of fighting who reigns in supreme and unquestioned domain over all martial arts. As the progenitor and creator of the concept of martial discipline, his powers are insane, standing at the absolute pinnacle of physical perfection and ability. After accomplishing his goal of teaching various races of mortals throughout the BTUverse how to defend themselves from the dangers of their home planets, invaders, and laying the frame work for greater and more powerful fighting styles to be created by them, he left the mortal realm, though not without putting a tiny fraction of his powers into a stone, which shattered into fragments inherited by varous beings throughout the BTUverse.