So many blue armor sets look great , but are of course, quite inferior in the stats department. I think that it should be fairly costly to get an upgrade, but a path should still be available.
My idea: So first, the rare armor piece should be maxed out with exp. Then, the player should find a piece of legendary armor with desirable stats. This legendary piece, along with an etheric light and 1000 glimmer, can be sacrificed to the rare armor piece to give the rare armor a legendary status and perks. It also gains +7-11 of the stat the rare armor piece was strongest in. This also provides a path of increasing armor rolls.
Just a thought. :)
Edit: This was just a toilet thought moment, lol.
I understand simple transmogrification would be ideal.
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Or just using esthetic light on a blue turns it into a legendary