From Heroes Wiki
Selene is a cold spiteful young woman. She has been used a manipulated all of her life by those that used her for gain. She lashed out and killed her father in a fit of rage and has been on the run ever since.
Selene has the ability to change one chemical element into another by a nuclear reaction. This ability works on both organic and inorganic matter. It can be used against a living subject with devastating results. The most obvious being instantaneous death. This ability has a byproduct of generating a conical nuclear pulse with a sixty percent chance of rendering a fit adult unconscious and a seventy-five percent chance to disorient everyone within a fifteen foot radius.