Phone Book of Heavens

Xia Yu, who traveled through another world, accidentally obtained a phone book in the universe. By dialing the numbers in the phone book, you can have conversations with people in other planes! He learned peerless martial arts from Zhang Wuji, and also learned magical magic from Master Gu Yi; He advised Voldemort to be kind, and warned Boros not to mess with a bald man named Saitama...