Scientia. the Goddess of Technology, and Silvanus, the God of Nature, have been sworn enemies since the dawn of time. As a result of their animosity towards eachother their demigod children have been waging war on eachother since prehistoric times.
Gerhardt Scientia Mechanica and Pixel Scientia Mechanica are Scientia's youngest children. And like all of her children they are both highly skilled technomancers. After their father died trying to buy them time to run away during an assassination attempt on them by Silvanus's children they are now living with their oldest living half brother, Alexander Scientia Calculo, in the Church of Science and Technology. However the war between their family and Slivanus's family continues to rage on.
One day, they and their older brother come under attack by Viridios, the oldest living child of Silvanus. Of course their older brother tries to defend them. However during Alexander and Viridios's battle Viridios ends up breaking an experimental teleportation device that Alexander had been working on and the device explodes. After that all four of them along with the entire building they are in are spontaneously sent to Equestria. However, their bodies appear to have undergone a drastic and unexpected change.
No matter the universe as long as at least one member of both of their families continues to exist the war between their families shall never end. However Viridios is not the only challenge they must face. For they are immortal and in a land like Equestria where friendship is so highly valued, should they gain friends they place themselves at risk of eventually falling victim to the condition known as "Accidia Immortalium". A mental condition that immortals will all eventually fall prey to after outliving enough of their former mortal friends and loved ones.
Thus they must avoid getting too close to anyone while adapting to their new forms and preparing for their next encounter with Viridios.
(Since this story seems to be almost as disliked as it is liked, I've written one final variation of this story. You can find it here. I'm only continuing one of them. So which one would you guys prefer I continue. You can vote: Here.)