I saw the child strike my brother down. Then they saw me, and flashed an evil grin, their eyes were as black as tar, and I could swear his purple and pink sweater were flashing green and yellow. "So, you're the demonthat has been killing everyone. Today, YOU. WILL. DIE." I said and summoned a hunters rifle and blasted at him. He jumped up as if it were nothing, his head brushing the roof. As this was going on, I could hear a faint tune in the background. I could smell the dust from the fallen on their shirt. I could see the room flashing different colours, switching from gold and orange, to black and white. I felt my soul pulsing with rage, both halfs of it. The light, and the dark. I pushed my fist towards him, summoning a fist of darkness magic. The child slashed at the fist with his blood red blade. This child is hard to kill, but for them, I will strike this child down. Even if I have to use the full extent of my powers. I thought to myself. Swiftly, I removed my gloves, letting my scars see the light of day. Almost instantly, my twin swords appeared, my blade of darkness, and my blade of light. The child's demonic grin grew bigger. The child tried to slash at me, but I parried the strike and slashed back. The child dodged under my blade and went in for a thrust, just cutting my shirt. I pushed the child back with my blade, cold and quick. I summoned a hunters rifle and thought, This is for you, brother. And blasted them. I could see the child's grin change into an expression of terror. Then, the blast hit the child, vapourizing the body, leaving only the soul. I felt overjoyed, but then I felt an overwhelming pain. I could taste blood in my mouth. I looked down. I saw that the child's strike on me cut more than my shirt. It had broken one of my ribs, right where my soul was. It was only through my determination that I had lived for so long before. But now that I was satisfied, it was no longer keeping me alive. My legs collapsed out from under me, my vision grew dark, and I died.
This is based on an AU of my own creation, brothertale. It features my human facing of against my strongest monster, my Gaster. He is the older brother of my Sans and my Papyrus and I had great difficulty in writing this, as I had a word limit for a creative writing thing last year, and I wrote this, which was quite over the word limit. I titled it, Brothertale: vengeance of the soul, but that remains in my book. If you want, I will upload it, however, but you will need to wait for it to be finished. Thank you, and please realise, that darkness is in the heart of every man, and those that embrace it, like my gaster, can wield it to great lengths.