Guys Deej said he can only show us the door/doorway, and Cozmo has Pocket Infinity equipped, why the hell would he have it equipped? Because the description for Pocket Infinity is "You cannot shake the feeling that this is less a weapon than a doorway"
Its the key! We need to do something with Pocket Infinity! I dont know what but something!
Edit: Its funny too cos i abandoned this idea a while ago and told my friends "all we have to do is wait for a specific mission to become the daily and it will give us that fusion core thing or the transmitter thing, bungie will decide when we get sleeper"
Then bam, new quest, it wasnt the daily but a new quest altogether
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Interesting note. In siege of the warmind (DB mission where you fight Omnigul inside the warmind), there is an open door to the new DLC area, but a door is closed at the end preventing you from getting to the full area. If a player stands here, he can get to Omnigul in the room during the event(which triggers the door to reopen) and you can kill Omnigul. Killing her doesn't make the door open, even on heroic, and it seems to stop the mission from progressing. After killing her, 2 super strong acolytes spawn. Killed them too, but still the door doesn't open.