Ultra Old Man: the Potential of Recruiting Disciples Is Returned and Becomes Stronger

I traveled through time and became the oldest loser in the Kingdom of Light, but was bound to the strongest master-apprentice system - the stronger the apprentice, the more invincible I am! Under the plasma spark tower, Lin Yuan looked at his wrinkled Ultra body, and his mentality collapsed. While others traveled through time to dominate the world, he transformed into a rotten old man who could barely walk without breath! Just when he was about to lie down and die, the rebellious boy Cero sneaked towards the core of the Spark Tower—— "Ding! The tenfold return system for recruiting disciples is activated!" Accept Sero as your disciple and give feedback to [Sagittarius Universe]! Accept Leo as your disciple and give feedback on [Leo's Explosion Law]! Accept Mebius as your disciple and give back the [Secret Essence of Vitality Bullet]! While the people of the Kingdom of Light were still practicing hard on light, Lin Yuan's disciples had already mastered: ✔️ Eight Gate Dunjia - Kick the planet to pieces! ✔️ The ultimate freedom - dodge is maxed out and you can't hit at all! ✔️ Kaio Fist - The combat power soared a hundredfold, and Beria's legs went weak after just seeing it! Severn: "My son worshiped an old man, and now he can blow up a comet with one punch?" Father of Ultra: "Is this senior's training method... Too hardcore?" King of Ultra (his best friend is pleased): "Old man, are you finally done with your business?" Let's see how the oldest Ultra instructor in history relied on "rebates from cheating disciples" to train monster disciples who swept across the world, and at the same time, he became the strongest in the universe!