The vault of glass was technically a vex throne world. They first encountered the concept of throne worlds in their battles with the hive. A pocket dimension/ universe where they make the rules.
English
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In the preydeths arm prices and lore he says it’s where they experimented with all kinds of space time concept
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Thought it was data hub or connection point for the gates that just distorted time to the point of existing beyond it, like having a room full of black holes. At least in terms of stretching time.