Fatalities
Hot-Headed (Scorpion)
Natsu brings his hands together and creates a magic seal before unleashing his breath attack. The flames light his opponent on fire, slowly melting away the demons skin. After a good second, Natsu grabs the burnt flesh by their skull. He unleashes a Grip Strike on the ninja head, causing it to explode with bits of brain and skull fragments. Letting go, the body falls over as Natsu looks at his hand and closes it in remorse.
E.N.D Unleashed (Liu Kang)
Natsu grips his fist as it turns into his demonic claws, before slicing into his opponent's stomach. The organs spill out of the champion as he tried to hold them in. Natsu quickly lifts him up and slams Liu back first upon his knee, causing the rest of the internal organs to explode out of the hole in his stomach. Natsu then throws the body to the side, letting blood drip out of the wound.
X-Ray
Guren: Karyuuken (Sub-Zero)
Natsu opens up his attack by sucker-punching the ice ninja. Then he hits Bi with a flaming right hook, cracking the left side of his skull. After that Natsu uppercuts with his right and launches the grandmaster, breaking his teeth and shattering his jawbone. As he fall back down, Natsu rears his fist back before striking them in the chest, fracturing the ribcage and sending Sub-Zero sliding across the ground.
Victory Pose
Natsu roars with fire to crest the Fairy Tail symbol before he raises his hand in the signature pose of his guild.
Ending
Natsu Dragneel stood over the fallen elder god in triumph. His battle was far tougher than he anticipated, but it made victory all the sweeter. The Dragon Slayer turned to the Jinsei out if curiosity and touched it. The corrupted force sunk into him and unleashed the darkness inside him. Traveling to the Neatherrealm he vanquished all who stood against him. E.N.D. now ruled the Neatherealm, and his eyes were set on Earthrealm."
I would like to thank Nergigante for the suggestions of Natsus Fatalities and X-Ray. He had some very good ideas for me. If you don't like this ending I gave him, just let me know and I'll tell you the alternative ending idea I had. Well, now we go from manga to comics with spider-man.