So Pradyth, Pahanin, and Kabr the Legionless decended into the Vex underworld of glass and darkness.
Pradyth was lost to the tides of time, the Legionless drank of the Oracles was in turn swallowed up by the collective, and Pahanin escaped the vault scarred beyond measure.
Their fates were nightmares made real, but with the Vex minds within the Vault able to rewrite reality as they see fit and scrub Guardians from the timeline, how many more fireteams descended into the Vex stronghold and ceased to be?
Was Kabr's team the only one? Or just the only one that managed to see any of its members escape back into our reality?
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There were probably more, but since vex erasure means that everyone that went in was forgotten, the vanguard must've sent in wave after wave sending them to their doom. Pahanin probably broke that cycle. If you stand in any major vex areas, you can see ghosts popping in and out of time, most likely from those doomed firetreams.