On GiantBomb's UPF just now Brad mentioned some mission from earlier this week where one of the quests was to defeat the Boss in Vault of Glass and you got some good weapon from it. What was he talking about and how do I start it next time its around? At first I thought he was just talking about the daily but he was talking about the last boss in the VoG raid.
If you find the secret ghosts when Paradox is the daily, you get an item to turn into the FWC rep in the tower. Then...at some random point in the future...the quest picks up again. One of the steps is killing Atheon.
Edit: Beat!