"Well, Dr Deloran...you've come at a bit of an odd time. You see the authorities recently broke up an illegal fight club, one that forced the poor things into deathmatches. Now, most of those little knives still need serious help before they can be of much use to a man such as yourself. Too dangerous, yes? Need to remember to live again, not just survive." A final nod from the slave merchant, as though she expected the topic done.
When Asire was discovered, it was considered a gift from the Gods. Not only was it a glowing crystal that erupted from the ground in various places around the world after what scholars called The Awakening, but was otherwise known as the worse earthquake ever experienced by mankind before or since; it was found to be a power source of incalculable potential, and even after a century of experimentation it was still common for new limits to be found and then shattered by the wonderous rock structure. The technological revolution brought about a baby boom...and the first of those to claim it was a curse. It was discovered that exposure, and even in some cases simply close proximity, to Asire, causes what is either the spirits of the world escaping to the mortal realm through an unprotected babe or a result of the radiation given off by Asire when in use causing mutations in unborn children, depending on your source.