The first half of the journey toward the mountain peak was very peaceful as there were no monsters here. But the speed at which they moved was very slow as the effect of the region was strengthening continuously. For that reason, Tomoe needed to stop quite a few times to re-calibrate her senses. Both of them also came across several corpses of vampires on their way.
As they were the bodies of dead vampires, the corpses were completely intact. Anyone seeing them would just think that they were merely sleeping and were not dead. Actually after a vampire's death, without any special circumstances, the body of a vampire should turn into ashes. So vampires usually did not leave a corpse behind. But here that was not the case.