"This is a time to rejoice, a moment that all Halo fans should savor. For the Halo 2: Anniversary Terminals have been found, and with them, your path will be clear; your entry into a greater understanding guaranteed. Your next Great Journey is nigh, and nothing – not even the Flood – can stop it..."
SPOILERS BELOW THIS POST: This thread is to be a discussion of the above content. Its a spoiler heavy zone.
Now that that's said, something fascinating that I just realized; The Arbiter is responsible for Thorne's parents deaths, he was in charge of the Glassing of Alluvion.