Eris will contact you through the Crown of Sorrow once she has formulated a new plan, and encourages you to continue to explore the Derelict Leviathan and contain its Nightmares in the meantime.
This quest will progress at the next weekly reset.
Rushing into things will serve no one. Eris has recommended a path of temperance, and she will review the information she gained during the first severance attempt and determine a way to help Crow confront Uldren Sov. For now, the Nightmares on the Leviathan must be contained, lest they spread elsewhere.