When a soul crosses to the afterlife, it journeys into one of two opposing realms;A divine source of harmony and well being or A consuming source of evil and malevolence. A midworld exists for the souls whose judgment has yet to be decided. It is commonly referred to as purgatory. For centuries Seven Arch angels, protectors of the light and seven fallen angels, soldiers of Darkness have silently fought for balance of power over these unclaimed souls. Each side is restricted to sending only one warrior in every spiritual cycle. Upon arrival they must assume human form to walk among humanity.
FOR THEREBY SOME HAVE ENTERTAINED ANGELS UNAWARE ! -Hebrews 13:2 KJV
They are charged with protecting us: Children of the light. For once the chain is broken and humanity has perished there will be nothing to fight for. No more light.