The demon saber reincarnates a prince (RAT7P harem x Martial artist reader)

(A/N: given the show has martial arts and swordsmanship I figured I learned it towards there but there still will be some magic)

Yang Wu, the Martial master of the dark faction and one of the four great evils of China finally died, In his last moments he wished he could of bing born in a world with more challenges to get stronger. Since his late teens he has done nothing but fighting his way to the top until he was known as the demon saber god, then once he drawled his final breath he saw a white void filled with many magical elements then he woke up as a baby, how will he The this world of magic and sorcery react to this Martial Master.