25. Tartaros Chapter - The Boy's Tale
Gray is shocked to learn that Silver is his father. Meanwhile, Natsu and the others continue their battle against the other Nine Demon Gates, while Minerva has a change of heart and Happy gets a mushroom-ectomy.
Fairy Tail
Season 6
This season has 39 episodes containing the "Tartaros" (冥府の門タルタロス編, Tarutarosu-hen) arc, which adapts material from the rest of the manga's 40th volume to the middle of the 49th volume, depicting Fairy Tail's battle with a dark guild of Zeref's demons who aim to resurrect E.N.D., their master and Zeref's ultimate creation.
26. Tartaros Chapter - Gray vs. Silver
The battle between Gray and Silver continues, although it's an uphill one for the Fairy Tail members, as Silver is an Ice Devil Slayer and therefore immune to ice attacks. Meanwhile, Wendy comes up with a desperate plan to stop the 3,000 magic pulse bombs from going off in less than an hour!
27. Tartaros Chapter - A Silver Wish
Gray knows the truth, that Silver really is his father! Juvia battles Keys, the puppet master of the dead. And petite mushroom Franmalth gives the Fairy Tail members the runaround so they can't stop the 3,000 Face devices from going off.
28. Tartaros Chapter - Air
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.
29. Tartaros Chapter - Steel
Gajeel is trapped in Torafuzar's toxic water. Even though his lungs are filled with air thanks to Levy, his body is quickly filling up with poison. And later, despite his body being filled with anti-magic particles, Laxus takes a last stand against the immortal Tempester.
30. Tartaros Chapter - Final Duels
It's Laxus's last stand against the immortal Tempester! Plus, Erza and company finally reach the control room, where the dead former Magic Council chairman is in the process of activating the 3,000 Face bombs. Kyoka and Seilah are also there, and quickly act to prevent the Fairy Tail members from interfering...
31. Tartaros Chapter - Wings of Despair
After more than seven years, out of nowhere, Fairy Tail's worst nightmare returns: Acnologia, the dragon that nearly slaughtered the guild's most powerful members. The timing couldn't be worse, as the Fairy Tail members are exhausted, but then Natsu somehow hears Igneel's voice...
32. Tartaros Chapter - Fire Dragon Iron Fist
Natsu interrupts the fiery battle between Igneel and Acnologia to ask his burning questions, but his former foster father gives him a task instead of answers: to steal the Book of END from Mard Geer. This prompts the leader of Tartaros to speed up Face's timeline, by having Kyoka form a living link with the activation device. Only Erza can stop her, but will she prevail against Kyoka's ultimate Etherious form?
33. Tartaros Chapter - 00:00
The battle between Erza and Kyoka heats up as the demon uses her Curse power to make Erza and the other Fairy Tail members in the room ultra-sensitive to pain. And if that's not bad enough, Kyoka steals all five of Erza's senses!
34. Tartaros Chapter - The Girl in the Crystal
Natsu, Sting, and Rogue take on Mard Geer together while Igneel and Acnologia continue their battle overhead. Meanwhile, there's still the problem of thousands of magic-decimating Face bombs set to go off, but Makarov has an ace up his sleeve...
35. Tartaros Chapter - Absolute Demon
Makarov may have a way to stop the threat of Face, but everyone's memory of it will have to be wiped afterwards. Meanwhile, the battle in the sky between Igneel and Acnologia rages on while Gray, now a Devil Slayer, joins the fight on the ground against Mard Geer.
36. Tartaros Chapter - Memento Mori
Rogue and Sting have one last chance to take out their former, now demonically resurrected, master. Meanwhile, it's hard enough for the tag team of Natsu and Gray to make any headway against Mard Geer's ultimate form, but then the Underworld King unleashes his ultimate curse, Memento Mori!
37. Tartaros Chapter - Soaring Above Ishgar
Gray survives Mard Geer's ultimate Curse, revealing that his recent changes have left him not altogether human. Erza defeats Kyoka, but the demon has the last laugh as Face is activated. Almost immediately, the Fairy Tail members are sapped of strength as the Face units begin to siphon magic from all over the continent.
38. Tartaros Chapter - Drops of Fire
It's dragons to the rescue before the Face devices can siphon all magic from the continent. But even as one crisis is averted, there's still the final battle between Igneel and Acnologia, as well as the reappearance of another well-nigh omnipotent foe.
39. Tartaros Chapter, Finale - Where the Power of Life Lies
In this epilogue to the Tartaros saga, the dragons reveal a tragic secret to Fairy Tail, while Natsu makes a vow to Igneel's fading soul. In the aftermath, Makarov dissolves the guild, several members set out on their own quests, and Zeref drops a shocking revelation.
