User blog comment:Grimraven/Players or Suspected Players in the New World./@comment-27023992-20151002040729

The problem with the 7 Heroes is according to Pinison Fall Perlia (the dryad) "Even the seven membber group that came last time had a real struggle fighting a part of it" ware as just one of the floor guardians and more then likely just one of the battle maids could destroy the main body with little effort.

So if they were players, they were low level ones, but more than likely they were god-kin or just Adamantite ranked adventures.