4 does exist in the example I have attached in the doc.
- There are a few sets around the world. If anyone has good pics, I'll add em to the doc. Though, some are just flipped images of the same thing.
- Rotokas is, to my knowledge, the only real world language that uses 12 letters.
- Unsure what the 5 one is at the moment. With the addition of Demon, those are probably the best guesses.
- Anagram seems likely based on the raid and the triple characters in a row. Sadly it doesn't seem to line up with Rotokas though. For example the 5 letter one would most likely be USPRG. Which... can't make anything useful out of that.
- No Kopru symbols in part 3. Don't think there are any unique ones in the raid though.
- I think there is indeed something to them. Giving us a list of 12 like that screams egg hunt. A key to unlocking their language. Though they may not lead to solving the dark secrets/breaking the pact, but remains one of the bigger mysteries, so maybe.
Edit: Since this is the top post of a new page. Another link to the main doc for easy access!
Isle of Dread Dark Secrets Master Document