I see a lot of posts and comments about these two things. Setting it straight.
1. Thorn's damage over time in crucible was unintentionally nerfed and deej was notified and bungie is investigating to fix it.
2. It may show the cryptarch as selling blues and purples in your companion app, but if you go to the tower and see, he definitely is not.
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Bumping this to raise visability until Thorn is fixed.