So the stranger seems to think that the vex come from the black garden, but at the same time we have grimoire cards stating that the vex found the black garden and began worshipping it, so they existed before its discovery. So is the stranger just very poorly informed or is this a major story inconsistency?
Can anyone clear this up for me?
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Perhaps after discovering the heart they moved their "base" there. Or even transposed their other universe over/under it. Remember the way we get there is through a vex gate and we are on a terra formed Mars. And then we're back on mars after the fight.