Prismatic Cultivation: Obtain Giant Killer at the Beginning

After traveling through 16 years, I finally got the Prismatic Hex Brawl Rune System! Whenever you advance further in your cultivation, new prismatic runes will be automatically unlocked. "Very good, let's start as a giant killer and reach the pinnacle of life from now on." "This rune is invincible. There is no limit to Hex Brawl. As long as the opponent is 10% larger than me, I will deal 10% more damage to him. There is no limit!" "No, the system, apart from letting me win the title of [Fat Killer] in the sect's martial arts fight, what else does it do?" ... Until one day, a shadow covering the sky and the sun appeared, and everyone was frightened. However, they saw a man bearing the shadow, standing in the air with a sword, and laughed: "Wow hahaha! Let me show you what it means to be a [Giant Killer]!"