Based on my idea “Stormquestria”

The Storm King keeps his promise to Tempest Shadow and restores her horn. However her new horn infects her mind, making her loyal and power hungry(she’s been brainwashed to believing she has always been loyal to the king) The Storm army captures the Mane 5 and Spike. But The Storm King says.

“It’s just aswell. Your plan failed but it was cunning, I could use that, I am after all, an equal opportunity oppressor.”

He brainwashes them all including Spike!

After the “Battle for Canterlot”, Tempest was promoted to “General” and is seen as second, only to the Storm King himself in terms of “The Storm Kingdom”, or as it’s sometimes called “Stormquestria”.

Picture made for me by, Chedx on devianart.