Detailed version: Trapped behind bars, he obtains the Super Hero System, which lets him draw techniques and abilities from all kinds of worlds. The Indestructible Vajra Legs can break anything, the Swift Movement Art lets me appear and disappear without a trace, and the Flying Sword that Slays Immortals is handy when I need to pass myself off as an immortal. As for medicine, divination, astrology, and the like, those are even easier...
Simple version: After obtaining a System that lets him draw all kinds of abilities, he plays the pig to eat the tiger and becomes a legend.
This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Please do not imitate.
