By the fires of war and hell

A dark blue pony with a black crown looked out at a thriving city from her lonely post at her balcony. "Luna?" called another pony this one pure white with a golden crown.

"In here sister" replied the blue pony known as Luna.

"Ah, good. There is something we must discuss tonight. A strong magical presence has been found on the lonely mountain, it has a few…peculiar qualities that we need to look into" the white pony known as Celestia said.

"Very well Celestia shall we be off?" inquired Luna.

"Yes, we shall go there immediately" said Celestia as a bright light surrounded both of the princesses and when the light dimmed both of the Alicorns had vanished.

When the sisters reappeared they stood at the mouth of a monstrous cave, within even from so far away they could sense as well as see a swirling ball of red energy and as they approached they could tell it was powerful, very powerful.

Suddenly with the sound of metal being ripped apart, the swirling ball of energy expanded to a little bigger than Celestia and became a flat disc. And with a thunderous boom a single flaming hoof stepped forth from the portal, and another blast of sound as a second hoof strode forward. A head began to emerge and the sisters could see that this creature was indeed an alicorn, at least so far.

As the rest of the creature emerged it was confirmed to be an alicorn, it looked around and smiled when its blood red eyes alit upon the sisters, "big sisters, its good to see you again" said the strange alicorn.

Celestia's and Luna's eyes grew wide as they realized why the magic had seemed familiar. "n-no its not p-possible, we locked our baby b-brother within the burning hells for slaughtering several cities" stuttered Celestia worriedly.

At this the Alicorn smiled wickedly, "yes you did sister, but the next time you try to get rid of a magical creature don't send it to a place filled with useable demonic magic" said the alicorn, he looked to Luna, what is wrong Luna? Don't recognize little Nidhoggr?"

"I never knew anyone of that name." mumbled Luna "my little brother was named Ruin."

"Much has changed these past few millennium sister my, my powers are under my tight control now. I have mastered my rage, and my hate. I have become a more powerful mage than both of you combined, the Asire saw to that!" laughed Nidhoggr.

"Who?" inquired Luna, who was becoming used to the presence of this strange alicorn who claimed to be little Ruin all grown up. But the more Luna looked at this pony the more she became convinced that he was telling the truth.

He was black with streaks of red on his coat and his cutie mark was that of a hollow summoning circle surrounded by six runes of power. The only major change that she could see was the hooves and the mane and tail. The hooves were on fire, and it wasn't a friendly looking fire, it looked hungry and furious. His mane and tale were black, not like her own mane that was black with thousand of stars shining brightly within; it was a soul sucking black with flecks of red that moved within and sometimes broke free only to sputter out and die.

"Rhen you're done staring I'll answer your question…and the questions I can see you are about to ask" said Nidhoggr with a grin "I'm not all to surprised that you don't remember the Asire, after all you visited so many dimensions looking for help against Discord. They are gods over the nine worlds. You visited them in their home realm of Asgard asking for help, they declined because they had issues of their own to solve in Midgaurd."

"After I lost my temper and killed so many ponies you sent me to hell. One thing you didn't know is that all the burning and freezing hells are connected, I found my way to neifleheim after a few hundred years of killing demons and taking whatever power they had, and it was this that changed my mane and tail. When I got there my name was already well known throughout the nine realms as a demon slayer of considerable power."

"By the time I arrived there I was nearly dead. I felt like it was hardly worth the effort to get back to a realm that hated and feared me, it was then, in my darkest hours that Odin and his sons and daughters appeared before me. He looked down upon me with a sneer and looked to his companions."

"See? This poor creature dosen't even have the will to keep himself alive, let alone take care of the dragon for us."