At that point in time, Emperor Varan did not know that Vaan had another plan to acquire communication with Great Devil Hecate. He was also unaware that it had made much more progress than his search for Galen's wife, and it was at a quicker pace than anyone could have imagined.
Nevertheless, it wasn't something Vaan planned to share with Emperor Varan for the time being, at least not until he had a tight grasp of the Great Ratholos Empire.
After all, Ophelia had a sensitive identity as the founder of the Black Witch Society. That alone was enough to make her an international criminal in the eyes of the world.
If it were also known that she shared some special relationship with Great Devil Hecate, more complications would arise in associating with her.
…
Inside Vaan's temporary subspace, the Fifth Progenitor and the Eighth Progenitor completed their oath under Contract Magic.