Natsu Dragneel vs. Doriate

Natsu Dragneel vs. Doriate is a fight fought between Mage of Fairy Tail, Natsu Dragneel and a Mage of Succubus Eye, Doriate.

Prologue
While Erza gets affected by Doriate's Retrogression Magic and has her Magic and appearance turned to that of a child, Natsu and others are attempting to fight off the treasure hunters of the Sylph Labyrinth Guild. Gray manages to steal the bottle of Moon Drip liquid and a battle for it commences. Lucy uses Sagittarius to counter Drake's projectile while Gray successfully dodges Hiroshi's attacks and throws the bottle to Natsu. Then, the bottle goes to Lucy who throws it to Wendy, with both of them dodging Hiroshi's Gunner Mode of his Chain Blade. However, much to everyone's shock, the bottle ends up broken on the ground as Happy doesn't manage to catch Carla's throw.

To their surprise, the amount of Moon Drip wasn't enough to melt all the ice. Happy keeps apologizing and asks Natsu to punish him, however, Natsu notices a voice coming from under the ground where the ice melted. Thinking the voice is calling them, Natsu runs off to that direction, unable to remember who that voice belongs to. On his way to the voice's locations, Natsu runs into Doriate. The latter disproves Natsu's claim that he is a thief and gets ready to use his Magic.

Battle
While surronded by Magical aura, Doriate casts his Retrogression Magic and Natsu finds his body to be shrunk to that of a child, much to his shock. While Natsu wonders about what is going on, Doriate states that disposing of Natsu should be much easier now. When Natsu again calls Doriate a thief, the latter shrugs it off and attacks Natsu. The Dragon Slayer realizes that with his body in this state, he is unable to move properly. Natsu then attempts to attack with his Fire Dragon's Roar, but all that comes out of his mouth is a small flame.

While attacking him, Doriate explains to Natsu that the child form is just a side effect as the real point is decreasing one's Magical power. Natsu thinks of this as dirty tactics and tries to counter-attack using Fire Dragon's Iron Fist, again ending up having little to no effect. Doriate manages to land a strike on Natsu with great effect, revealing that Natsu's defensive capabilities are also lowered. Suddenly, Natsu looks at something and yells out, wonder what that 'something' is. While Doriate is distracted by this, Natsu manages to escape, laughing that this is how kids fight.

Aftermath
As Natsu flees the battle, recalling that Gildarts used to fall for the same trick, Doriate is angered that he is being looked down on and threatens to reveal the fearsome power of a non-human, while showing off his demonic face. While Natsu continues running, looking for the mysterious voice, Gray meets up with Doriate. His initial thought of Doriate being with thieves is quickly disproved when he witnesses the non-human's face. Doriate wastes no time and Gray finds himself in his child form as well. As Doriate approaches him to attack, Gray's memories of his past return strong as ever and he yells out Deliora's name, surprising Doriate. The latter explains that this is one of the effects of Retrogression Magic and with joy grabs Gray's face. However, Gray manages to recuperate and frees himself, ready to battle the demon in front of him.