The airship carrying Lin Fan's group didn't head out long before stopping.
The airship was just too big and too eye-catching. If they were to fly that thing in there, it would be strange if they weren't immediately shot down by the beasts.
So they landed it just a kilometer away and got out, using their own life energy to fly the rest of the way.
Momonga's dark laws could also be used as a cover like the shadow laws and while it was weaker than the shadow laws, with how strong Momonga's laws were, there was no problem hiding themselves from the senses of the beasts at all.
The beasts were all gathered around, forming a circle with a wall of bodies.
If it wasn't for the fact that they could fly because of their cultivation, there was no way for them to break through this wall of pure beast muscles. The only other way would have been to find a secret passage and with how unlikely that was, it would have been a fool's dream.