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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People doing the sparrow wall glitch have already found another room under the room omnigul appears in inside the seraphim vault. My money is on it having to do with reaching that room (without glitching into it).