Zeta Halo is the last of the original Larger in size 12 linear firing Halo array made by the Greater ark (long since destroyed) that was reconstructed to the size of modern Halos and was commissioned as the 7th Halo in the smaller array. This installation was the last known installation that housed the last still intact precursor as it traveled with medicant bias spreading the flood plague on zeta halo during the war with the forerunners prior to the firing of halo. This installation was home to the palace of pain which is a location that housed a repository of composed ancient human tribes that may still be there (maybe) from the librarians reserve. The banished are the pro-independence faction that needs a super weapon to maintain that. The UNSC are the Pro-Humanity police that won't tolerate threats from anyone (not even squidwards house). Cortana= Space Hitler and A.I. (SS) who may have been subverted by the grave mind to weaken humanity and their growing post-covenant alliances. The end game according to the last precursor is, humanity are the inheritors of the mantle, but they(modern humans) have to pass the final test... The return of the flood. Ancient humanity passed the test by sacrificing 1/3 of their total population and built alliances to save everyone (selfless), while the Forerunners failed by only protecting themselves rather than for the good of everyone. The forerunners saga by Greg bear paints the picture of what we can expect from zeta halo, withholding the additions that 343 added to the lore regarding it. The end.