Fairy Tail Series 2 Episode 79: Tartaros Chapter: Air
Episode 79 of 102 of Fairy Tail Series 2, aired October 9, 2015, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Sting and Rogue continue their battle with Mard Geer, leader of Tartaros. Meanwhile, Erza and Minerva are still in the labyrinthine Cube, searching for the control room so they can stop the continent-wide magic pulse bomb detonation. And Torafuzar and Tempester turn into their ultimate Etherious forms to take on Dragon Slayers Natsu and Gajeel.