Lilitniya

Lilit or Lilith is a goddess or demon, still worshiped in the East under the name Niya. While revered by Easterners, Nordlings believe that she will return someday and bring ruin to the world - Witcher 3 wiki

The Black Sun was to announce the imminent return of Lilit, still honoured in the East under the name of Niya, and the extermination of the human race. Lilit's path was to be prepared by "sixty women bearing gold crowns, who would fill the river valleys with blood."

Believed to be the second Siren born on site! Welcome little weird girl!