Blazing Souls

Before the Princesses were born—no—before their mother was born, there were great and magical creatures that were more powerful than ponies—such power could move mountains and even the land. These creatures were mysteries to ponies, they appeared in front of ponies to help them—or kill them.

Ponies had feared them, knowing that these creatures were powerful than them. One of the creatures they feared were centaurs. Their ruler, Nappak, commanded them to raid ponies' homes for alcohol—the thing they had always wanted in their life. However, the ponies were protected by minotaurs. The ponies agreed to become their allies as they protected each other from creatures with malicious intents.

Greed, evil and malice grew in some creatures, driving them into insanity. They declared war against the ponies and their allies to win the land. Ponies were terrified, of course, having your enemy stronger than you was bad enough, but having the first war in the history?

The ponies and their allies protected their land, wanting to end the bloody war. But the enemies started to outnumber them and became more insane. The grandfather of the Princesses sadly declared that they should be sent to Tartarus—the place of torment and suffering that he made. They shouldn't be sent there, but the creatures killed many lives. Stepping into the war, he cast the spell.

The spell stopped the war, leaving only the ponies, the creatures who allied with them, and the creatures who didn't participate in the war. The gates of Tartarus was guarded by the three-headed dog with manes of serpents and claws of the lion, Cerberus, preventing someone to enter or escape Tartarus.

The creatures separated with the ponies, living in their own lives. The havoc that painted Equestria was fixed, and the peace and harmony remained. However, the thing that drove the imprisoned creatures into insanity and evil was completely unknown.