Void Dragon Slayer
Acnologia sniffed. Something was amiss. Having just mutilated that annoying bug named Gildats or Gilsarts or something, he was reasonably irritated. Then he recognized the magical signature.
"Kyuubi..." Sensing the power of his only rival, Acnologia proceeded to use magic only available to those who use void magic, or some bastardized version of it.
"Void Art: Seeker: Kyuubi!" Seeker was a very temperamental void magic. It basically sent the caster through time, space, dimensions, and solid matter, just to get to the target. Acnologia relaxed as his wings were filled with the wind from the void tunnel. No matter how long the actual journey took, he would appear at that exact moment in time when he casted the magic. In this case though, the magic didn't take that long, seeing how Earthland was nearly a parallel dimension.
Acnologia was greeted with the vision of a burning forest, with Kyuubi slashing its tails everywhere, trying to swat some form of mage out of the sky. The 'mage' was blond, and had cloak with fire patterns on the bottom. He was teleporting with odd throwing knives that had 3 prongs on all of them. The most notable thing however, was that he was carrying a baby, which Acnologia bet was his child. The great dragon then noticed something off about Kyuubi. It's eyes were the same as that blasted Sharingan. Acnologia growled. The only technique that could control a demon such as Kyuubi, was Tsukiyomi. Thank god it didn't work on dragons.
Upon seeing the oddly powerful 'mage' try to seal Kyuubi, Acnologia sighed. It was doomed to failure. No amount of human energy could seal Kyuubi. At most, he could banish Kyuubi to another dimension. Acnologia was not surprised when a claw slash brought the blond human to his knees. As the cloaked human collapsed, Acnologia took to the sky. Kyuubi wouldn't even know what hit him.
"Void Dragon's ROAR!" As soon as Acnologia let loose his blast of shadowy power, he choked in laughter. The human with the Sharingan was trying to stop his attack. When the idiotic insect was vaporized, and Kyuubi left with a smoking hole in its back, Acnologia was getting ready to leave, back to Earthland. That is, until he heard the baby's cry.
Apparently, the baby survived all the teleporting around, and his father had shielded him from the claw strike with his own body. Normally, Acnologia would have ignored the child, but the child was not normal. Its eyes were open. And they weren't blue. No, they were black. Not just the pupils either. Both of his eyes were completely black. There wasn't a pupil. But this wasn't what startled Acnologia. If eyes could scare him, then he wouldn't be considered the greatest dragon of all time. The child was holding some of his Void Essence in his hand. That settled it. This child would be his. Acnologia had finally found an apprentice. The time of the Void Dragon Slayer was at hand.
"DADDY!" Acnologia sighed. The child was undoubtedly strong, smart, and cunning, but he was still a child. In fact, the child had cried and cried when Acnologia was trying to name him until he stumbled across a name that he put out there in desperation.
"What is it Zeref?" The young blond flew into the wall of Acnologia's meditation room.