Batman should never die.
He cracks after the Joker finally pushes him far enough to kill him (Frank Miller, thank you for that gem). He builds his bat army from the leftover "Mutant" forces and convinces the Justice league to help him take down Ra's once and for all.
The battle ranges accross the planet as one by one the enemies of the Justice league are swept away in the all out war to follow. Every enemy they face is backed into a corner. Every enemy leaving them no choice but to eliminate them once and for all. The story builds to a head in Ra's secret fortress above the fountain of youth. Through the dark recesses of those tunnels the Justice league is mortally wounded one by one. Only Batman and Superman are able to finally reach the bottom level.
While walking through the tunnel to the chamber where the bubbling cauldron of immortality is located Batman tells superman to procede ahead. He is getting sore in his old age.
Superman enters the room. Ra's, mortally wounded yet unbroken, stands before the bubbling cauldron of immortality.
Superman "It's over Ra's, give up."
Ra's "This is what was meant to be. I haven't failed. This is my triumph!"
Superman "You cannot win. Your forces are broken and you are wounded. Good will always triumph Ra's."
Ra's "You fool. I was once the teacher. But my pupil has surpassed me. Surpassed even you!" he pulls out a small crossbow with a kryptonite bolt and points it at superman but superman blasts it with his laser vision.
A moment of confusion glimmers in Supermans eyes. "what could he have meant by that?" He realizes where he is. Realizes what lies before him. He realizes too late. His confusion is contorted by pain as a glimmering shard of kryptonite explodes from his chest.
Superman collapses to his knees. He coughs up blood and looks over his shoulder the pain stricken look on his face telling so much more than physical pain... the pain of betrayal. "Why Bruce?"
"Because it must be done."
As supermans last bits of strength fades from his body he watches as Batman strides forward into the chamber. Stepping over the now dead Ra's as he strides into the pool. Everything went perfectly.With his enemies consumed and the Justice League immaciated no one will be able to stand between him and his quest for true justice.
Enter the Avengers crossover series.