BlackStar_BH
Concepts like Haki were nothing special in the Xianxia world. Cultivators had sharper senses than Observation Haki. Something like killing intent or sword intent could exert more pressure than King's Haki. Even in Wuxia novels, there were many body forging techniques that could compete with Armament Haki. Apart from the existence of devil fruit, I don't think the world of One Piece is very special. A 'Heavenly Demon' from a random Korean martial arts novel could even kill Kaido.