So I'm pretty sure I've done the campaign entirely it's been awhile since I played last until recently but friends and I wanted to do pit of heresy but it's locked for me still and eris doesn't give me deepening wake nor is it in the quest archive anywhere I don't know what to do.
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When speaking to Eris have you checked to see if she had a second vendor page? Occasionally Quests and other items get stuck there. If you don’t find anything like that, there’s always the option of creating another character and clearing the SK campaign again to see if she offers the Quest. (΄◉◞౪◟◉`)