Wishing All the Best
Complete an Ascendant Challenge.
You must be Ascendant to see and enter the Ascendant Challenge portal. Consume a Tincture of Queensfoil to become Ascendant for 30 minutes.
Petra Venj keeps a stock of Tinctures on hand for situations like these.
Mara directs you to the Ascendant Plane to find a coalescence of Taken essentia, which could be used to cleanse the egg.