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Here it is, my decoder for all of the new ciphers in The Book of Bill.
Huge thanks to Jim and trickenGF for help with the color cipher!
I plan on creating fonts for most of these soon, but in the meantime, feel free to extract parts of the png for your own use from the transparent version below the cut.
I'll also explain how I got each cipher down there.
Theraprism: Brute-forced* using the first 4 ciphers in the book, then filled out via the decoder ring that appears in the dream sequence of The Last Mabelcorn.
Rune: Brute-forced* using the posts from OregonParksDept, then filled out via the stone that appears on page 111, "Cipherstitions".
Cipheric/Alchemic: Brute-forced* with lots of effort, and then filled out with the actual font its from (1651 Alchemy), where we discovered it's just the capital letters of that font. Womp womp.
Color: Brute-forced* by Jim and filled out via help from around the world! Some of the letters were only found via copies in different languages, since we have so little to go off of.
Bros. Secret Code: Solved using the key in the photo on page 161.
*Brute-forced means taking the symbols given, with no other information except the cipher itself, and using frequency analysis and word probability to break the cipher logically. Things like unique word structure (things with double letters, for example) help to speed up this process.