Rose walked behind them as they climbed a series of stairs.
They'd long passed the familiar study; now, they were on a very dark staircase, and the windows were heavily covered with thick dark curtains as if the moonlight would melt down the walls if it came through.
The other staircases were quite brighter as the curtains were drawn, and the orange hue of the moon showed into the castle.
But this time, she knew they were getting closer to Cassius as the place kept getting darker and darker, and the atmosphere up there was quite chill a typical vampire king's abode.
They climbed the last stairs, and Rose realized that they were on the last floor of the Blood Castle.
Pitch dark.
Even the Elves had slowed down the pace at which they walked, they were probably using their imagery at this point because they might have been there before.