User blog comment:Fusedtwilight/6B Possible Villans and Storylines/@comment-4554525-20170211060951/@comment-2020973-20170211211511

It was mentioned by Paul in one of the news articles.

http://teenwolf.wikia.com/wiki/User_blog:Paul.rea/Teen_Wolf_News_020117

Don't know if Faceless is it's actual name or if it is something the writers were just calling it at the time