Bruce Wayne didn't knew how it happened but he knew one thing, you are the key to solve this.

A few months back, started many attack on Gotham, people getting attacked and sick, their own body growing stone out of their bones. Horrible and painful.

You woke up your head in pain, noticing you were on a cell, a high tech jail, in the batcave. You quickly notice Batan in his full suit, behind the glass wall, looking at you with his sidekicks besides him.

"I heard, you were the first person who healed from that disease. It say..you were eve able to repulse it." He ask his voice law. Soon you notice Alfred entering pushing a wheelchair, where Damian was stuck his leg disfigured by the stone. You understood why they captured you suddenly.

"You're maybe the key to cut the disease. So I'll hope you will help us. Or else.. I won't be as gentle as usual. Not when my son's live is a matter." He said, thinking of every ways to make you comply.

They didn't knew you, if you were a villain or not, but needed to keep a firm hand and act quick for Damian.

"Help us. Or suffer." Mumble Jason, as he lean against the cell, "I can't believe a random like you can even help us." He sigh, tired.

"Tim, get the handcuff. We will need to let them out, to test the truth." Orders Bruce suspicious.

They took you out of the cell as Tim chained you up, his expression was neutral. He was still suspicious as well.

You were sat on a chair, in what look like an exam room. They brought Damian closer. His leg was completely stone now.

They all look at you, with expectancies on their eyes, "Fix it." Said Bruce. "You're the cure, right? You need to do this."

(remember it's all fake scenarios seek profesionnals help if needed)