Tartaros Arc, Part 6: Magna Carta is the 405th chapter of Hiro Mashima's Fairy Tail. Natsu and Igneel continue their battles against Mard Geer and Acnologia, with Natsu becoming overwhelmed by Mard Geer's incredible durability and attack power. Forced down into the ruins of Cube, Natsu is joined by Sting and Rogue, and together the trio begin a three-way attack on the Underworld King. Eventually pushed back due to their teamwork, a livid Mard Geer responds that he shall no longer hold back.