Make sure you go to the portal. It's in the room after the green room where you have to go around the edge then jump down. Instead of going around the edge jump to the right side of the room then go towards the back then you can shoot at the oracle that is behind the portal.
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Yes, you also have to have the other 6 first, otherwise the 7th won't show up at the Vex portal
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I know that but other people on here are saying they already have the first six oracles.