User blog comment:LordLuminous/Reviving END: Curse Power Needed? Questions/@comment-24066070-20140726090343

Since the Face Project seemed quite important to Marde Geer, I think they can gather this Curse Power through the negative emotions caused by a succesful activation of Face.

A "curse" may also refer to something negative, so it could be Tartarus would gather negative emotions like fear, despair, rage, pain, etc.

If all these Mages would suddenly lose their Magic, there would be an abundance of these negative emotions, felt by both the Mages themselves and the people who rely on Mages for protection and whatnot.

If Face is really stopped, Tartarus may have to resort to other measures that would cause these emotions.

Considering the next part of the Tartarus Arc is called "Ultimate Pain", perhaps Tartarus would finally kill a member of FT. For a Guild like FT, losing a comrade would cause "ultimate pain" and all the other negative emotions I mentioned before. Perhaps these emotions would then be used by Tartarus to fuel E.N.D.'s ressurection.