Seven Deadly Sins: The Story of the Eighth

*Important story note: I am currently watching the Seven Deadly Sins. I have not made it through the whole show. I am currently just starting the 3rd season. Without saying any spoilers, the story may or may not change based on the progression of the show. Also, I'm not going to be recapping the entire show. When needed, I will add extra/helpful info to help. Otherwise, watch the show. It's awesome!

Legend tells of seven deadly sins who's betrayal led to the death of a grandmaster. However, it was later revealed that it was the other grandmasters who were responsible for the death. Once the Holy Knights discovered this, their loyalty shifted to the Seven Deadly Sins. After an intense battle, one grandmaster was slain at the hands of another and the other was killed by the Sins. At this point, six of the Sins are together.

What is not known, is that before all of these deaths and realizations, the grandmasters were giving apprentice knights demon blood. One of these apprentices, Aislin (Aye-ss-lynn), took to the demon blood well. So well that she was taken over and became the Eighth Sin. As she was man-made, her symbol appeared as a mythical beast and not of one from this world, a Phoenix. She became the Sin of Destruction and soon realized that she had a deeper connection with the sins than she realized...