This happened twice... I was wearing mask of the third man (Lvl 40) and I bought a legacy engram so he gave me Lvl 20 mask of the third man. I also had Lvl 40 MIDA-Multitool. He gave me a lvl 20 from a legacy engram....
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Legacy engrams will always decrypt into year one exotics with year one attack/defence levels. Bungie weekly update: 17/09 [quote]Xûr will also choose a Legacy Engram every week. These Engrams contain Year One Exotics (at Year One Attack and Defense levels) for players who want to finish up a Collection. They strongly bias towards Exotics not already in your Blueprint Collection, to help fill in the blank slots - excluding Mythoclast and Necrochasm, which are still only available from their Year One sources.[/quote]