(I just wrote the entire story and description of a darklord for a domain base on The Sound of Silence but it got erased because the site automatically logged off.
Long story short: a metalist serial killer. Now perfectly fine with having become a banshee - it fits her aesthetic - but stuck in a city where nobody dares to sing or listen to music because an even more powerful spirit drains the will of those who express too much emotion with their voice.)