The Tartaros arc (冥府の門(タルタロス)編 Tarutarosu Hen) is the fifteenth story arc of the Fairy Tail series. The Dark Guild known as Tartaros makes their move on the Magical World. Beginning with an attack on the Magic Council Headquarters, the Nine Demon Gates quickly begin the execution of their plans, starting with the elimination of almost the entire council. In the aftermath, news of the event is quick to reach the ears of Fairy Tail. After over one hundred civilians are killed by Tempester's Magical Barrier Particles and Tartaros' targets are known to include former council members, Natsu declares war against the Dark Guild.