After Practicing for Thirty Years, You Didn't Expect Me to Be Invincible?

I was accidentally brought to a different world by a down-and-out system. In order to avoid being hunted by the system's first master, Fang Haoxuan practiced in a cave for 30 years. In the past 30 years, Fang Haoxuan had perfected all the basic magic and sword skills, but an accident made him walk out of this world. He originally thought how dangerous this world was, but in the end Fang Haoxuan found that he seemed to be invincible? And all the basic magic he has practiced, or all the basic swordsmanship, are equivalent to a god-like existence in this world?