Luna is sent, along with young Twilight, to old Neighpon to try and quell the feuding warlords with diplomacy. And, if that fails, reduce the bloodshed as much as possible. Turns out that Luna is the kind of mare that likes to jokingly flirt and see how far she can go to make the other uncomfortable.
Boy is she in for a surprise.
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So the inspiration for a lot of aesthetic and naming is primarily Japanese, however I'm taking from all of the orient and I'm being fairly loose with the accuracy. Translations and terminology won't be exact, don't expect a historical rendition of feudal japan in pony form here fellas.
Will update tags if more of them become relevant.

Two powerful beings on opposite ends of the spectrum. One ruled her land with kindness and order. The other saught to rule the world with his cahos and wickedness. Natural enemies. From birth they were doomed to fight. To seek the others destruction. But were they always like this? No. They once enjoyed much simpler times. Times when war and hate were nothing but a bad dream. When youth and arrogance worked hoof in hoof. When young love, seemed as though it would last an eternity. These are the times the two have forgotten. Until now.

This story is a sequel to You're Not Fine

Friendship is a give-and-take relationship. Fortunately for you, Pinkie doesn't ask for much, and she has plenty to give.
Maybe it's time to start giving back.

A week after moving to Ponyville, Violet Petal as already seen and experienced wonderful things such as the Elements stopping evil villains and monsters, the Castle of Friendship, and Pinkie Pie's parties. Unfortunately, she has also experienced many awful things. Including prejudices from the town's residents. For she is a Thestral, or "bat pony," to the more blunt members of society.

After one particularly bad day, she runs across a strange bipedal creature napping in the park.

Author's note: I was featured! It was for a few minutes, sure, but still!