3000 Years ago, Equestria was divided into three major territories, Canterlot, the Crystal Empire, and War City. It was originally a peaceful paradise, but darkness is eroding this country.
The daughter of the Space Princess—Aletina and her lover Sombra, originally guarded this place together. But Sombra longed for strength in her heart, and was swallowed by darkness. From that moment on, Tina turned against him, and he wanted to take over the entire Equestria. From then on, Tina took on the title of "war" princess.
Thus began the millennium of slavery in the Crystal Empire.
In order to deal with Sembula, Tina has not slept for a thousand years and has fought hundreds of times, but both of them retreated every time.
The source of Sembula's dark power is also from someone else.