Weak

While Aster was "fighting" against Nolan, Lilia appeared in the outer space near Prasil, Augustus managed to break free from her grip and immediately distanced himself from her.

"What the hell was that, how did we move so much I couldn't react at all!!!", he thought.

Lilia saw his confused expression and she shook her head, normally at space one's voice would not reach others, but that changes when a cultivator reaches the void manipulation realm or any of the equivalents in the body or soul path.

To be able to survive in the outer space without a spaceship a cultivator must reach the mortal transcending realm, there is spirit energy everywhere so and a mortal transcended can use it as vital support instead of oxygen and to a certain extent as a replacement of food and water.

That being said, only void manipulation and above can freely travel through the space just using their physical bodies, and even then, they would need to stop to rest at some planet along the way.