Steven was imitating King Elbas. He was burning his world to achieve power that went beyond his limits. Obviously, his actions didn't lead to a personal level, but they still got the job done.
The dark aura that filled the higher plane countered the privileged cultivator's technique, but Steven had far more in store. As the crack on his forehead expanded, a new, darker light left his figure and invaded the area occupied by his opponent.
The privileged cultivator didn't care about the incoming aura. She seemed amused by Steven's efforts, and she even enjoyed watching her technique being suppressed.
The fact that Heaven and Earth's army suffered heavy losses after Steven's actions didn't affect the privileged cultivator at all. She shook her head after seeing how her underlings couldn't achieve much without her power, but that was it.