First i would like to say i love the game and i love what its become with the expansions I have a suggestion for an expansion which woukd allow you to integrate more of the story into the game tho. You have all of this lore stuffed into grimmore cards and its kinda fustrating having to read all of it. So my idea is do a vex expansion where they open a rift in time and you as the gaurdian have to go back to all of the major events in destinys history and stop them from changing the time line. An example would be like you go into the vault of glass with tolland so he can make the relic than just before he dies like in the lore you get ripped out of the time stream and dropped into the next time line event. Again an example you could go back to the war of the six and the reef wars. Also to add to this ive thought that they could use murcery for the planet allowing for another planet in the game and would also stay in the story line since mercury is supposedly a giant vex machine. I could even see the raid as something where you have to fight your way into the core of the planet to stop the time rift