I just remembered that this is a crossover with a obscure PSP game called Undead Knights, so of course the human tag is addressed.

The attempt of a group of ponies, the Holy Pillars, to destroy a necromancy book went horribly wrong and unleashed a powerful dark magical pestilence that instantly plagued half of Equestria, turning the infect ponies into voracious zombie like creatures. The name given to that plague, based on the interpretation given by various equestrian biologists about it's nature, was Necromyth.

Many cities fell with the pass of the days, with a few of them having hastily converted into fortified citadels to keep the plagued tides at bay. The uninfected ponies who were caught in the middle of it struggled to survive, while other had either perished or joined the infected ranks.

That would be terrible enough... But then something entered into the mix.

As the chaos caused by the infected ponies was running rampart, an entity emerged in the middle of the crisis, confusing itself among the hordes. What seemed to be something silmilar to a pony who fell victim of the pestilence just in time to become one of them, at first, was in reality an undead pony liked, bipedal brutal figure. A sentient being who had already adapted to this ravaged world.

A monstrosity who wasn't a product of the Necromyth, armed with a gruesome power at his command, and memories of a very compromised past life, opposed this chaos, but only because he was following his own agenda. Regardless the fact that he was fighting a horribly plagued madness, he isn't so interested into saving Equestria.

Relentless and with the ability to turn living beings and infected alike into his literal undead minions, he goes in a bloody path to both get revenge against the ones who had killed him during his newfound pony life, who may have connections with the responsible of this pestilence shredding the land, and achieve his goal to fix Equestria according to his own terms. His own cruelty is on par with his own determination. His own might powerful, combined with his own wits, were enough to annihilate anything that stand in his way

Or so he thought.

Despite what he was claiming to be, his conscience will eventually make him consider about of his past mistakes until he gets him to the present ones. Other than the infected and the other ponies, who were standing in his way for a reason or another, he will also face cruel uncanny foes, dark secrets, old acquaintances and his own flaws. Is still to decide if he is going to be ally, a dangerous threat or something far worst of these.

But that will depend of how he is determinate in his intentions...

A warning:

1) Let me tell you, I wrote that just as a warm up. Also this is not a very standard zombie story, so of course I expect some criticism since I have in mind to make one that would be, I hope, much better than this the next time.

2) I won't expect anything from this story since I don't know how that will come out. Also, I added Rainbow Dash because there won't be always all the Mane Six, unless someone requested or I would have the idea to add one of them.

3) Any criticism and feedback are fine, especially because I want to see how the atmosphere came out.