You get them from doing the Gold Coin Mansion in HZ with the superior passes you get from doing black runs in the dungeon in the cave of the conqueror
Thanks for the response, so just minor clarification: Is it normal red GCM or should be either green, red, black Sup GCM will drop this set?
Normal pass runs dont drop the rank 1 war spirit set, to get the set you need to run it with superior passes