After the three tribes arrived in Equestria, enemies from their past have returned to seek revenge.

The Sins of the Past are hunting the Elements of Harmony as they try to survive in a world they no longer recognize.

A pegasus whose memory has been mysteriously wiped wakes up in an abandoned factory. The one major problem… its not actually abandoned.

My name is Summer Sky. I woke up in a storeroom closet, and I have no memory of who, or where I am. That, however, is the least of my concerns. Everypony here is dead, and whatever killed them is in here with me.

The Everfree Forest is a dangerous place...