The artifact. What is it? How it it used? Who can use it? These are questions that don't have fully known answers at the present point and time. Scholars who have looked into the Faceless Lords have determined a few things, however:
While scholars know only a few details about the Artifact, and argue
even about these details, it is suggested that without the use of the
Artifact, the Faceless Lords would not have been as successful as they
were in their last conquest.