Did you travel around a lot? Part of a cultivator's job - if not the main part - is fighting monsters and exorcising ghosts and demons from places and people, right?

[That's what he thinks he remembers from what the other timeline's Xingchen told him on Prismatica! In that regard cultivators are not all that different from his homeland's onmyouji... though those definitely don't know how to fly on swords, at least not as far as Hijikata knows.]