Audio Files, similar to those in Halo: ODST, would be an effective method of sharing more of Destiny's lore in-game. Get some inexpensive voice actors, have them record a few lines that help tell about stories or events related to the game lore, and pepper them throughout the game world. To make it even better, have an audio file give some clues as to where the next one may be found. This is a (relatively) simple way to add in some more story telling to the game and tracking down the audio files adds another in-game activity. It would be cool to hear more from Osiris. It would be cool to hear from people that experienced the Cabal invasion of Mars or Crota conquering the Moon. There is a lot of storytelling that can be done through this, and similar in-game means, that would really help shape the world to a greater extent for the players.