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?