Fairy Tail Vol. 59 (manga)

Mavis manages to successfully escape, and Fairy Tail renews their resolve to take back their guild! Meanwhile, a mighty change has been boiling up inside of Natsu’s body—his demonic power has awakened. The power threatens to transform Natsu’s will, and he makes his way towards Zeref—until one man stops him in his tracks! The icy Gray Fullbuster is determined to kill E.N.D., locking the two comrades in a brutal battle that threatens their very existences.