Myriad Worlds: Starting with the Myriad World Pearl

Lin Chen awakens the Myriad World Pearl, which allows him to open a portal to the 'Wuxia World: Great Song Jianghu' once a month. He cultivates basic martial arts in Tianxuan Continent, plunders divine martial arts manuals (Nine Yang Divine Skill, Dugu Nine Swords, etc.) in the wuxia world, uses gold from the wuxia world to buy medicine in the mortal realm, and uses ores from the mortal realm to forge divine weapons in the wuxia world. — Description from novelcodex.org