Ciphers and Codes

Ciphers and codes are various means of encrypting information so that it is not legible to any recipient other than the intended. Naturally, the party tends to crack other people's codes whenever they can. Many party members have solved a code at one point or another, but the party's most accomplished codebreakers so far are Ashra and Claire. 
The codes here are different from the other kinds of puzzles which are found everywhere in Eon in that once cracked, they are a process that can be repeated to encode anything. Therefore "Tears without tea" is not included here, because while it encoded information, the solution can't be applied to encode anything else. 
==Hex Notation==
Used in a scribble in the back of Comentarii de Bello Populi and to open the cryptex containing the Letter from Grax to Marcus. Hex code is a manner of encoding letters and numbers in a Base 16-based code using the numbers 0-10 and the letters A-F, usually formatted in groups of two characters. Claire solved the code immediately, but didn't explain it, Ashra spent a long time trying to rederive it with no success, and Leilah Maloch successfully decoded the message. It was used to encode "DUPLICITOUS" in the book and "CHECKMATE" as the combination. 
Ashra still doesn't know how to do hex code by hand. Here is a tool to do it by computer. 
==BTRIH/BTSIH==
BTRIH is the key to a cypher. It is based on the phrase "Better to reign in hell than to serve in heaven" and "Better to serve in heaven than to reign in hell", which are based on Paradise Lost and used by Ashra to represent the philosophical difference she sees between herself and her brother Grax. BTRIH was used in one of Leilah's dreams from Anahita to encode "Not all letters are meant to be read." BTSIHTTRIH is the alphabetical part of the combination to the company's stolen safe.
==Xenteroth's Number Codes==
Xenteroth's number codes are based off Xenteroth's Sequence (1 1 2 3 5 8 13...). They usually involve reading only the words that do or do not appear in the sequence, or using only the letters from the sequence. 
==Anagrams==
Anagrams involve simply scrambling the letters of a phrase to form another phrase. Sometimes both phrases have meaning. Examples of anagrams relevant in Eon are "sinful reordering" <-> "ruins of Eldergrin", and "nosrep fle lalah" <-> "halal self prone"<-> "pelor has fallen".
==Rot 13==
Rot 13 is one of the most basic codes, moving each letter of the alphabet to its exact opposite place. It's sort of the Pig Latin of cyphers. Backwards rot13 was used by the wall in the Ruins of Eldergrin to encode "HIGH REGENT XENTEROTH." Give it some slack, it's a wall.