But whether the sword was a magic sword or not, it wasn't important to Xu Fan, as long as it was powerful.
Of course, that wasn't the case for others, for getting the Heavenly Fiend Great Demon sword was rather a curse; in two or three months, it could drive its owner to lose their sanity and become an unconscious mass-murdering mad demon, causing massive troubles.
Even a Golden Core expert like Luo Wutong was influenced by the magic sword, slaughtering his companions to the last, which should make it clear how strange and mind-bewitching the magic sword was.
Luckily, Luo Wutong had some ability; aside from initially being unguarded and letting the magic sword occupy his mind, he remained cautious afterwards and wasn't influenced again.