Go to the lectern near Eris you can re-acquire the quests for all the armor nothing is stopping you from completing the campaign.
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Reread post. I said it's locked as in doesn't exist.
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Have you visited the abandoned quest kiosk at the tower, There you will find it left of the postmaster.
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Eris has the armour I just can't claim it cause it says it's in abandoned quests and it requires the beyond quest which does not appear anywhere for me.
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Says it requires beyond quest completion