The Book of E.N.D. [1]

A proud Celestial Wizard, Lucy Heartfilia, and a oblivious Fire Dragon Slayer, Natsu Dragneel, both in the guild Fairy Tail, go on guild missions with their team.
The team consists of a Requip Mage, who goes by the name of Titania, or in other words, Erza Scarlett. An Ice Make Wizard, Gray Fullbuster. A Sky Dragon Slayer, Wendy Marvell, and two exceeds, by the names of Happy and Carla.
But what will happen when the team goes on a mission that directs them towards The Legendary Black Wizards creations, they actually find themselves standing in front of the Wizard himself.
What happens when Lucy decides to join the Black Wizard?