The demons of the Tartaros Guild have been defeated and the guild has been rebuilt. Natsu has taken home the Book of END desperate to uncover its secrets. When Natsu starts reacting oddly to Gray's magic, how will they figure out what's going on? Will this be the end of Fairy Tail? This is an angsty tale of the transformation of Natsu into END. GRATSU fanfic. Adult themes. Violence