Raven: Lost and Found

Everyone knows Damian was the demon heir, the sole son of Talia Al Ghul and Bruce Wayne.

But what if he had a sister?

Many years ago, Damian and his twin were born. He was born one minute earlier, and instantly pampered. His twin sister was cast aside and deemed useless - after all, they only needed one heir.

But she did have uses. The league had been working on methods to grant their assassins meta powers for years. It would be too dangerous to test them out on Damian, but his twin - as close to him as they could get without cloning the boy - was the perfect specimen to experiment on.

So Damian Wayne grew up royalty, as deadly and cold as a knife.

His sister, L0n4, grew up a lab rat, as volatile and powerful as a nuclear bomb.

One was brought to their father by their mother.

The other escaped.