Once you acquire the Vex Mythoclast from the Vault of Glass Raid, you can get the catalyst by going back into the raid an completing secret oracle puzzles activated by hidden Vex plates. In order to complete the quest to obtain the catalyst, you must already have Vex Mythoclast, so make sure you've already obtained the exotic fusion!
Higher stacks of Overcharge increase stability.
You must ALREADY have Vex Mythoclast
You must be Light Level 1300+
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