As he got closer and closer, Soran's footsteps became lighter and slower. The dragon had a pretty good listening ability. Even if Soran had high Dexterity, he might still be found sneaking in. Fortunately, it was a white dragon in front of him. It didn't have high-grade magic, only some spell-like abilities. Otherwise, Soran would need to be careful when sneaking in. Once a dragon's nest has evolved into maze overtime, there would be many traps in it.
The dragon in front seemed to be sleeping, but it still had a sense of the world.