So here’s what happens a while back (In December) I played raid and I got the full armor set and it was for my hunter and it was in my vault one day so I could remember my accomplishment and then I transferred it to my hunter and it was gone and I looked in my vault and my other characters and I still got nothing if somebody at Bungie could read this it would be awesome.
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If it's truly gone, your only option is to do the raid again and get it all again, as Bungie does not replace any lost or deleted items or characters, for any reason.