After entering the city, the adventurers and the knights found a proper inn to rest at. The inn wasn't fancy, but it was good enough for normal civilians. They'll only be staying for a night, there's no need for a luxurious place to stay when they are being assassinated.
Cliff and the others entered the inn and were welcomed with a warm atmosphere that came from the scented candles and a ceiling device that looked like a light bulb but powered by an orange mana stone.
"Woah– An orange mana stone for a light source? Isn't that… kinda wasteful?" Assuming that the orange mana stone is what he thinks it is, it is reasonable to think that using it for light is indeed wasteful.
A middle-aged man standing at the other side of the counter noticed and heard the lad's statement, he sighed "It's a normal mana stone painted with a special paint that changes the color of the light it illuminates– why are you even questioning it? Tsk. Nobles and their privileges."