As an Armageddon, Vestal was at the apex of beings. An Armageddon by itself is powerful and could destroy an entire country by itself, and Vestal was a tier higher than that.
What makes her more special than the others was how she was made. While other Armageddons, like the one at the Championship of the Greats, require parts of the souls of the users to allow the Armageddon to manifest.
The Sins sacrificed some of their souls to create the Armageddon. Meanwhile, Vestal was different. It requires the entire being of an individual to form her. That means that she does not only need he soul of the summoner, but the body, and the existence itself.
As she manifests, the ones who manifested her disappeared into oblivion. They couldn't see the Afterlife for they are gone, and never to return.
Claer grunted as she kept on trying to seal her wounds. "I have been trying to break free from the curse and I luckily managed to do so right on time."