Over a thousand years ago, a great crime was committed, and three innocent souls, acting only by the rules of nature, were locked away. Until recently.

Recently freed from their ancient prison due to the growing strife among seaponies and hippogriffs, the sirens emerged from the waters. Though a resistance quickly arose to oppose their new musical rule, they too were eventually swept aside and drowned out by the song that ruled all.

Hippogriffia was theirs, and their victory tasted sweet, but they all knew these were baby steps. There was a long road ahead of them. A treacherous path filled with dangers and revelations, one that would challenge everything they once knew and held dear, sometimes turning expectations on their head.

Zebrica, the ancient home of the Zebras and more lay just beyond the Seaquestrian channel and, with it, a land of mystery, opportunity, challenges, and surprise. A new, modern world is rising, one which strikes at the very type of magic with which the sirens have so long claimed supremacy over others. It is time, now, to weather this great current and let their song stay true throughout it, to let it be heard far and wide, through the trenches and cities, over the boom of artillery and the roar of airplanes.

The shores of Zebrica await, and the show must begin.

This story is a sequel to Secondo. Reading it is advised but not ultimately necessary. The description above (and the first chapter) give a sufficient enough description of what happened in the prequel.

Similarly as the prequel, this story is set in the Equestria at War alternate universe.