Isn't This an Unrivaled Technique? Why Do I Have to Create It Myself?

He transmigrated to the Desolate Ancient Continent. Fifteen years! Fifteen whole years! Wearing animal skins, living in caves, chased by bears, and roasted in turn by ten suns! Fifteen years! Do you have any idea what I've been through? You say you have the best cultivation technique in the world? What took you so long? Hurry up and serve it! What do you mean, it's a technique that will become the best in the world? I have to write it myself? Fine. Give me a chance. I'll show you what it means to spend fifteen years honing a single sword!