After the dark below expansion came out vanguard. Crucible and the other factions sell purples that high in damage now and exotics are upgraded also but you can still get both versions. And yes you can upgrade your exotics at xur he offers upgrades for certain ones every week
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What do you mean for certain ones?
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He offers random exotics available for upgrade. If you have an exotic and want to upgrade it you have to wait until xur offers that upgrade It costs 1 exotic shard and around 7,000+ glimmer