"Leviathan Emperor," Natsu stared at the towering figure of the white-scaled leviathan in horror, "What is he doing here?"

Zeref was also staring at the leviathan emperor in shock, it is beyond his expectations for the emperor of seas to appear here.

Acnologia was staring at the leviathan with a furrowed brows. He thought that with his current strength, then he should be at least as strong as the leviathan emperor but it seems like he overestimates his own strength.

'...but, he was asleep for more than 400 years, while I roam the world, fighting and sharpening my skills, I doubt that I won't be his match.'

"Well, it has been 400 years since we last seen each other, leviathan emperor," Zeref smiled and greeted him, even though he was shocked, he quickly recovered returned to his calm persona.

The leviathan emperor leaped in the air, as his body began to shines, and he fell down, he was now in a human form.

Standing at 260cm, a long white hair that reaches up to his back, a pair of silver eyes, and a body build that makes Laxus look thin.

Leviathan emperor glance at Zeref, then to Acnologia, before stopping his gaze to Natsu. "Immortal....Dragon....and..Unknown?"

Natsu frowned, he doesn't like the way he was being called, "What do you mean unknown? I'm a human."

"You..are..an unknown...are you..a Dragon..? Titan...? Leviathan..? Divine..? Or....a demon?" The leviathan emperor said, it has been four centuries since he last talk, so it was still hard for him.

"Didn't you hear what I said? I'm a human." Natsu glared at him, he really hates being called as demon or anything, he is a human!

"I...see." The emperor nodded his head, before he sat down in the ground as he glance at Zeref. "What...are your..plans..for..the..seal?"

When Zeref heard his question, he glance at Natsu, who folded his arms and narrowed his eyes while glaring at him.

"Alex is still not ready-"

"All of us are." Acnologia cut him off before he could finish his sentence, "All of us aren't ready, but do you think those guys cared? Once the seal broke, they will once agin invade Earthland, and this time, the three overlords are not strong enough to push them back."

"I estimate that it will take a year or two before the seal will break, and at that time, we need your member to seal them once again, Natsu." Zeref said while narrowing his eyes.

"Are they really that strong?" Natsu asked, Acnologia, Zeref and even the Leviathan Emperor are all ridiculously strong beings, is there really someone that can scare them?

"Tch! Even I am not stupid enough to fight them, and your asking if they are strong? You can't even beat me, much less those guys." Acnologia said as he glared at Natsu.

Natsu narrowed his eyes as he glanced at Acnologia, "I can't beat you? Wanna bet on that?"

Acnologia smirked, "Come!" The instant those words left his mouth, Natsu appeared in front of him, with his hand, covered by a reddish-gold flames and blue lightning, he threw a punch.

Acnologia opened his palm and caught his fist, causing a strong shockwave that blows everything around them, except Zeref and the Leviathan Emperor.

"Weak," Acnologia muttered, before sending a kick to Natsu's side, which he blocked by his other hand.

Natsu opened his mouth as a ball of reddish-gold flames covered by blue lightnings appeared, and with a powerful roar, it blasted Acnologia away.

The sky turned orange due to the extreme heat radiated from Natsu's flames, however, the leviathan emperor and Zeref was still unharmed, they were floating in the air as half of the island was burning.

Then, Acnologia once again emerged, his cloak was burned away, leaving him in his tattered pants, both of his hands was burned, but it already began to show signs of recovering.

"Not bad." Acnologia smirked as he approached Natsu, "In just seven years, you are already standing at our level, but your still too young to think that you can beat me."

"Let me show you, how a real Dragon King roar." Acnologia opens his mouth and blasts a large beam of black energy towards Natsu.

'BOOOM!' A large explosion occurred, and the island they were previously standing at, was now nowhere to be seen, Acnologia was floating just a feet above the water, while Natsu was nowhere to be found.

Then, a wide area of the sea began to boil, then Natsu, covered by a dark crimson flames with black lightning coiling around it, emerged from the sea.

"Hoo~?" Acnologia let out a smirk as he stared at Natsu, a sun-like tattoo was now imprinted on his ċhėst, the magic power he was radiating was enough for Acnologia to take him seriously.

(A/N: Just like the cover, just don't include the tattoo on the arm)

"Is this a new form? Your power is really crazy, if I measure your strength, then I guess you're as strong as Igneel when he was at his peak."

Natsu remained silent as he just fiercely glared at Acnologia, Natsu released an incredibly strong and large flames as it surrounds him like a sun being covered by black lightning.

The large amount of water was already evaporated, causing a thick steam to covered the area where they are at.

When Natsu was about to attack, the leviathan emperor appeared in front of him, ignoring the scorching heat he was radiating and punched him in the gut.

Natsu's eyes turned white before losing his consciousness.

The flames and lightning disappeared, and aside from the steam and the boiling sea, there is no signs of any battle happening.

Zeref and Acnologia approached them, the leviathan emperor glanced at the two of them before saying, "Let's...go..find...another...island..."

Thw two nodded and disappeared, along with the leviathan emperor and Natsu.