Batman: Gotham Knights

You head up to the fire escape and find yourself on a catwalk above Ra's Al Ghul. You jump down and pounce on him, only to find yourself assaulted by Ra's' manservant, Ubu.

"Not smart, Detective." Ra's chides, "If you didn't think I saw you coming, you're dead wrong. Now, if you do not back away, Nightwing here is going to die."

"What are you up to, Ra's!?" you cry.

"Ubu... please leave us."

The large man does as he is told.

"Obviously you would know nothing of my plans. The Mach Diamond is said to be made from a natural fusing of Kryptonite and the purest form of Diamond known to man. The chemicals I stole make up the base form of my Lazarus Pit. What I am doing, Detective, is making it so that I will never need another bath in the Lazarus Pit ever again! The Riddler brought me a ray gun with which to apply my formula, Killer Croc, Poison Ivy, and Two-Face helped to procure the Mach Diamond, and the Scarecrow helped to attain the chemicals. They were all handsomely paid for their services. You see, Batman, I will bathe my Lazrus Pit with the Diamond-powered ray, and then add the chemicals to strengthen it. I will never age, and I will be impervious to harm thanks to the Kryptonian physiology imbedded in the Kryptonite. In short... I shall be as a God."

"Not tonight, Ra's." you mutter, "Not ever."

"One step closer and I cut the boy's rope." Ra's threatens, "I wanted you here tonight, Detective. I wanted you here to also partake of the Eternal Lazarus Bath. I want you by my side!"

"I've turned you down again and again, Demon. My answer is still no."

"As you wish. But do not stop me from my bath. If you move from your spot, the boy falls. Now stand still and watch the birth of a God!"

Ra's removes his clothes and walks slowly towards the glowing, steaming, orange Lazarus Pit.

You have to do something! But what?