Twin Phoenix Queens
With his judgment cast on the four people from the Eternal Twilight Imperial Family, Davis no longer bothered with them. As for the servants, Davis didn't care.
Whether they fulfilled their conditions or snitched on him mattered little to him as he had the power to strike back. The only issue was that he had to abandon the First Void Dust Sanctuary, as the number of people assuming that he was somewhere in the Eternal Twilight Lower Realm was already high.
Furthermore, the realm could be found easily since Shirley had appeared around three towns away from the Great Desolate Plains.
They would only have to trace Clara's path back to Highnode Town and from there to the Great Desolate Plains, and voila, the First Void Dust Sanctuary would be present there as long as they could search deep.
Stella was strong, but surely, her mini realm wouldn't be able to escape a Peak Empyrean's senses.