In addition to that, these arts could be used to create curses, or undo them.
William thought these arts were used to counter the curses, never imagined they were the same methods used to lay down these curses in the first place.
"It's like a sword, can be used to defend a nation or take the life of its monarch," William muttered, while reading his way through the basics of these arts.
In general, there were seven different paths of these arts, all depended on the type of spirit affinity of the master. William already had his own speculations about the right spirit affinities to use such arts. And now he got the answer in much detail.
The affinities included time, fate, and destiny. These three were ones of the rarest and most unique affinities in the world. William met Panther, a master with spirit that could see through time and pry over the future.