Artherra

Artherra, did you read The Story of a Bird and Spider? It's Clintasha and it's awesome!!!

Hi, I just wanted to ask if someone got the cypher in my book. xD
          It took me to write it at least a hour, so it's a challenge for you guys! 
          It's not that hard, you just have to think outside the box! And also, if you'll solve it, it's going to help you find some easter-eggs later in the book... 
          Of course it's going to be explained, but if someone have nothing to do (and want to, for exaple, write secret messages for friends) I would be honored if you try to solve it. :)