Forum:Rebuild Era Quiz

On my recent project, the Rebuild Era, I added a faction under the cover name of "An Old Enemy That Will Return...". So, the first person who guess correctly what they are, gets an award, though I wont tell what it is yet :P (I'll give you a clue to the question, though: It's a common enemy in the Halo Games) Also, anyone who would like to help in the Rebuild Era Project, is welcome to ask me if you can. Ciao,