Not far from the place where is located fort of Royal Corps of Monster Hunters a letter may be found. appleseedy
The words are easy readable,
During my journey, I was a witness in some vile ritual, found behind huge massive wooden door, sleazy shrine and some kind cult of black-robed figures. The time I discovered them was a pure luck, if i can name it like that. There were a woman along with helmeted person and a small sized humanoid wearing halberd or scythe. I coudn't keep looking on their bloody ritual, they spotted me and send their minions, to get me im sure about it. I was lucky, managed to outrun these zombies and other grimes. If You are willing to known where it's exactly located and I know You do, hit the bell at your Keep three times, this will mean yes, that your going to stop them with their experiments on children which were also there, binded to few trees. I coudn't help them...My eyes weren't prepare for such drastically moment, like a thousand needles sticking to my body. I'm looking forward to hear the bell gong, after that I shall send You a map with details about this location. Same letter I sent to Triadic Keep, due to that frightening place.
The only thing necessary for the triumph of evil is for good man to do nothing.