Travelling Worlds to Save Us (A Karna-Arjun story)

Two parallel universes: one where Karna and Arjun are sworn to kill each other, another where they grew up together as Kunti's sons.

The latter get a glimpse of the former. And now Arjun is determined to save himself and his big brother in the evil world and is drawn in by a stranger wielding a flute and wearing a peacock feather, who seems to know everything.

Karna is forced to follow him, because he knows, in this world, not everything can be fixed.