Tartaros Arc Prologue is the 356th chapter of Hiro Mashima's Fairy Tail. As the Magic Council convene to discuss Tartaros and their plan to take out the Dark Guild, they are attacked by one of the members of the Nine Demon Gates, who assassinates them all. Meanwhile, in Fairy Tail, the guild discuss E.N.D. and what it could be, whilst Doranbolt finds Cobra in his cell to interrogate him over his knowledge of Tartaros, only to find out that all of its members are Demons, with E.N.D.—Zeref's strongest Demon—being their Master.