Europa->Asterian Abyss->Concealed Void lost sector.
At the end of the lost sector where you fight the final boss there are pillars with a cube at the center. If you climb up to the top there will be a mini floating pyramid. If you jump up to it an objective waypoint will appear over the pyramid, any ideas why or if it’s a secret?
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That's a part of a triumph involving Salvation's Grip.
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If it's a small black pyramid shoot it with the salvation grip