The War on Tenrou island continues on the ravaged landscape. Fighting in what is left of the forests, scattered Fairy Tail members skirmish against the remaining Seven Kin of Purgatory members. Juvia, fighting to protect her 'beloved' Gray, takes on Meldy in a water battle that can only end in death. At the same time, Lucy and Natsu take on Kain Hikaru.
Unfortunately for Hades- with his ranks thinning quickly, he has but one option left to stem Fairy Tail's comeback: unleash his most powerful wizard- Sub commander BlueNote Stinger.
Other battles rage on the island: Gildarts, Freed, and Bigslow return to aid Fairy Tail. Gildarts and Bluenote go head to head in a 'Crash Magic' vs 'Gravity Magic' battle that sinks part of the island! After Azuma uproots the Tenrou tree, everyone's powers are sucked from them- well, everyone except Erza. Hoping for a challenging battle, and glory, Azuma decides to let Erza keep her powers.
Meanwhile, only one other Purgatory member is not fighting: Ultear. By a chance of fate, Gray happens to run into her while she is trying to carry Zeref back to the Grimoire heart ship.
I wont give any spoilers on these fights if possible, But part 10 ends with a 4 episode long battle with Wendy, Natsu, Gray, Lucy, and Erza vs Master Hades. Hades- with his ancient primordial magic, has ENDLESS flowing magic power that he can gather and use at his will. Though fighting with everything they have, Fairy Tail's strongest team looks beaten until an ultra powerful ex-Fairy Tail wizard shows up in an attempt to turn the tide once again.
Overall, this is my FAVORITE Fairy Tail part. I remember rewatching "Erza vs Azuma" the first day I saw it three times. Other battles like Juvia vs Meldy, I had to rewatch multiple times as well. The World's most powerful, and renown guilds square off in an all out, climactic duel in Fairy Tail Part 10! (here is the official FUNimation trailer for Part 10 on youtube: https://www.youtube.com/watch?v=s7la_LYJg38 )