There is a paranormal creature so powerful and sinister it's name has been erased from history. invaders

First of all, no one knows invaders’ real name. Ancient civilizations and cultures had encounters with them but their name is already gone from history. It was erased from languages. It was erased from history books. It was erased from the collective memory of humanity. <br><br>Why and how? One theory is that humanity invaders so much they pledged to never utter the word again. We know that invaders name is hidden deep within the forbidden forest of the Bahiravi Holyland. According to legend, one invaders already exists in our world.