An offshoot of an offshoot 'verse

Post TDKR. There had always been rumours in Gotham of things that were a little more than human. Batman, some people insisted, really was a bat, or he at least he had wings. That part was incorrect, but there were mutants in Gotham. Living on the outskirts of society or in secret, a large majority chose to join Bane and fight against the world that had forced them into hiding. Nobody would risk being seen after the way they'd reacted to Batman (and he wasn't even a real mutant).

Unknown to the leaders of Bane's rebels, a mutant with a particularly special mutation infiltrated their ranks, slowly working her way to the Head of the organization by replacing Talia al Ghul. It's not clear where the real Talia ended up, but Mystique began to guide the League toward experiments that would ultimately result in the production of a serum that would create new mutations in the average human body. The serum was introduced into the water supply in small batches, and when that failed to have any effect other than making a few people very sick (as far as they knew, at least), the League began experimenting on their own people. The mutants, ultimately exposed by the risk they'd taken in releasing the experimental dose, retreated further into the fortifications the League had set up for itself. Some of the League's members stayed with them, hungry for the power that a mutation could lend them. Mystique revealed herself, unwilling to sacrifice the rest of the mutants so that she could retain the illusion of Talia's power.

Some of these experiments were a success, and there are plans in the works to introduce the 'vaccine' to the populace. It's become a war of the mutants and their supporters against everyone else, much to the rest of the world's horror.

Are you working against the mutants? Were you one of them from the beginning, or were you turned because you volunteered? Worse yet, are you one of the few from the first serum dosage that simply chose to hide that the mutagen had worked? It's all up to you.