Inside the walls of Tambelon Castle, Emperor Grogar, the Father of Monsters, makes his best attempt to raise his new creations...three young ones known as Discord, Cosmos, and Eris. Some distance away, at Midnight Castle, are the young princes Tirek and Scorpan. When the kids of Tambelon and Midnight meet, it marks the start of a new friendship. Trouble eventually comes, and the group finds themselves influenced by evil. When they discover ponies for the first time in the form of two young alicorn sisters, a more power-hungry side to Grogar becomes unraveled. Discord must fight to keep his friends from getting wrapped up in the resulting chaos...or else he risks losing them, and himself.

This story will elaborate upon these characters’ backstories that have been somewhat seen in various official works of FIM and will be kept as canon - or at least something that seems like it could work canonically - as possible.

Or, Captain Goodguy V Mare-Do-Well: Dawn of Potatoday.

A crossover that nobody asked for.

Part of the Borderworld.

In the distant past, Grogar created thousands upon thousands of monsters and set them loose to ravage the Equestrian countryside, sowing fear and terror in their wake. It was a magnificent time of anarchy like none seen before or since. When he was driven underground, Grogar could no longer control them, but what of it? As he bided his time, consolidated his power, the monsters were still loose, doing exactly what he made them to do.

Except, much to his chagrin, some monsters were reformed. This includes a certain draconequus.

And said draconequus is so happy to see his dad again.