tossed in another tl;dr, full post will be up tomorrow in the edit
or not, because then I'd take away the option to post for those who yet haven't.
Here
Spoiler (click to show/hide):
My dearest, most revered heroes, I bid you a good day. Do not be alarmed, I speak to you through telepathic ways. Firstly, allow me to introduce myself. My name is Sincerella, one of the residents of the Monster castle. I am intruding in such a way to inform you that The Lady, the so called 'leader of the rebellion' is in fact fooling you. She she refused to admit her true intentions, even to her most trusted advisers, but I have learned the truth.
In the castle are at present three different ulterior motives. For one, The Lady wants to create some sort of leverage she can use when negotiating with the humans. For in her mind the only way of survival is co-existence, but the humans are not trustworthy. Arrangements have been made before, but humans are quick to forget alliances their grand-fathers or even their fathers have made. No, co-existence would be the downfall of this last bastion of hope.
Secondly, the daughter of the demon lord. Although not physically present, her emissary is already hard at work to spread her corruption, something you have in fact helped shape. The human Raze for instance, is not what she seems. But there is more then one way to corrupt a castle, and not all paths have been revealed to me. What is clear however, is that the demon princess wishes to recruit all of us in a massive army to conquer the humans, and to create a second demon realm where we and humans alike will be their slaves. The demon world is in no threat of the humans, even thought they make it sound like it. Instead, they see this world as nothing more then a possible colony and a source of easy slaves.
Between these two, co-existence and subjugation I seek to find a path in between. Instead of submitting to either the humans or the demons, I aim to create a safe haven for our own kind without external interference. A place of solitude, where we as a species can lick our wounds and bolster our numbers. For we are not ready to take on the might of the human armies, nor the ironclad fist of the demon hordes.
I beg of you, seek me out. I have encrypted these words in such a way that you will be unable to speak of it to another person for both our safety, but alone that will not suffice. I reside in the castle, but hidden deep in its catacombs. Only the Duchess knows how to find me. Seek me out should you find yourself like-minded, and ask the Duchess for directions. A good day to you, heroes. May your paths be safe and your actions fruitful.