Nightfalls

Like the night follows day

And summer follows winter 

Happiness follow Sadness

daydreams follow nightmares.

Success follows failure

As dessert follows spice

There is moon in night

and snowflakes in winter

There is sorrow in happiness. 

And evil in kindness

There is beauty in hard work.

There is sweet in sourness

(nightfall by Friends)

The night is the perfect invisibility cloak. As night falls all the people hide from the evil that escapes, using the night as a hiding hood. Same was the case for Kitty. 

She was staying at the gems dorm. It was strange sitting among people who were so different from her yet o same. They acted like how a normal person lives through their day.