Godseeker

The Godseeker will be a prominent character featured in the Godmaster content pack. Currently little is known about the Godseeker. Stated on the official Team Cherry blog:

"The Godseeker arrives (and your romance options expand). Track down this disturbing yet alluring being, break her chains and aid her in an ancient duty."

The Godseeker is found behind a breakable wall in Royal Waterways. Inspecting the coffin shows that a Simple Key is required. Using it reveals the path to the main location of the DLC which involves several boss fights.