Echo of The Void

You're at the deepest part of a sealed underground ruins. After hours of solving puzzles and evading traps, you finally reached its final chamber. Expecting treasures or curses inside, you're a bit stunned when you find a sword instead. On the chamber's wall is ancient inscriptions, saying: "A sword is good and evil at once, heaven and hell, hero and villain, cursed and blessed at the same time. Anyone who wields the sword shall put themselves in-"