Since the Daedric Wars storyline ended with Summerset, we get a break in an overspanning and huge plot, and get to know more about the Argonians of the Black Marsh in Murkmire.
An explorer named Famia Mercius is recruiting adventurers to join her on an expedition into a sunken Argonian xanmeer. Ancient treasures and mortal danger both await within this mysterious ruin.
You can either travel to Lilmoth yourself and talk to Famia Mercius, or pick the quest up in your Collections tab!