Instead of using the demons as the vanguard, they used the heavenly court's name in the entire Northwest universe. They wanted the three great heavenly court battleships to visit some other universes. If the universe was weak, they would subdue it. If it was strong, they would evaluate it and let the heavenly court make the decision.
In essence, these three heavenly court battleships were doing the same thing as the vile Emperor. However, it was a different story if they used the heavenly court's name. In fact, it had an extraordinary significance. To the heavenly court, this was the first official step in their external exploration. To the universe region, this was the symbol of the heavenly court's power.
Xuanyou heaven, sect master's mansion.