My dearest Starswirl,
By the time you've read this letter, chances are you'll have figured out my little charade and I'll be long gone. Where did I go, you might ask, and why did I leave? Well, these questions are easily answered, but, unfortunately. . . the answer isn't easy to give. But allow me to start by saying, that in your current state, there's no way you could possibly defeat my brother. I state this not as a sign of affection for my brother, but as a simple statement of fact. You could have the entirety of both the Pegasus and Earth pony armies standing behind you, but with the combined might of the Oracles' divination and the alchemists biological, disease-based warfare, you would all be reduced to nothing before you even launched an attack. I feel that, with my help, you all might have a chance, but I knew you wouldn't approve, especially once I explained the. . .circumstances, which my plan relies upon. I don't think that, even now, you would approve. And, to be frank, it would pain me too much to write those particular circumstances down.
I suppose I've said all I need to say. You know my story, how I came to love you, and how strong my love for you has grown. Anything else would be superfluous. So, I guess the only thing I can say is good luck, Starswirl. And stay strong. Don't let your will falter. Continue on the path you walk, which I mean literally this time, and you will see me again. But please, brace yourself. You may not be happy with what you find.
I can't say I like the way the implications of this letter. But if I'm interpreting it correctly, then Rain ran off to Negra Beliza, to do what I don't know. I'm going to get her back though, even if I have to tear her from the deepest, dankest dungeon that Sombra has to offer. And then, I'll banish Sombra to. . . to. . . the sun! Or the Moon, or some crevice, deep within the Earth! I don't know where I'll put him, but it won't be comfortable, I can guarantee that.