From The Citadel on Venus, there is an entryway guarded by 2 level 20 Minotaurs. If you proceed in, there are a couple large hallways littered with level 22 Vex. At the end is what appears to be some sort of gravity lift which goes up to the Citadel construct itself, but it's guarded by a tall barrier, and there is no apparent way of proceeding further.
What is the point of this room/what am I missing here?
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Well, it's natural to assume it's for DLC, but none of the planned DLC's that we now about take place on Venus, at all. It's possible that locations like this, the Seraphim Vault, King's Watch, and etc. will be added on and unlocked for free later down the road, but there's no way to know that right now. I'd say we got a 50/50 chance at it