So far Nyx hasn't played a huge role in this fic, and you will see more of her in the future of this story. 

When she was first introduced, Percy described her as having silvery-white hair and sharp features. She was cloaked in shadows and darkness, wearing a cloak made of corpses. Her skin is a dark, navy blue color. Her eyes, on the other hand, have no pupils, and the iris looks like the moon itself with a soft glow and the sclera is pure black. She usually wears a pure black chiton.

She is feared by Zeus. This is very important to the story. When Percy escapes Tartarus, he uses the power of his patron in order to return to camp. 

There's a possibility we will be introduced to Nyx's husband, Erebos, and we may see a few of her children, like Thanatos or Nemesis in the future of this story. (I'm not too sure yet. I know I have to bring in some at some point in this story, so I'll have to introduce them at some point.)

When Percy escapes into the mortal realm, Nyx helps him navigate his way through the world, but only at night, because that's the only time she's allowed out of Tartarus. 

Don't worry, once a month they'll meet up and play chess together.

DISCLAIMER: If you skipped the chess chapter, you may want to go back and read it. Chess plays a big part in this story. When I first added it, I did it as a joke, but looking at my notes the word "chess" is mentioned 6 or 7 times. 

Also, the next chapter has a time skip. I'm not sure when it'll be out, but hopefully in the next month. 

(Happy birthday to Frank, Grover and Piper!)