Firstly, the Sufrant alphabet. It is important to note that this is read from left to right, then right to left, in a continuous “S” shape. We feel they may have chosen this way as once proficient in its reading, a small amount of time is saved.
The dragon cultist used various different cyphers, including a straight alphabet substitution. Let me know if you would like to see the words he wrote. The alphabet cypher was exactly 5 letters to the right, so “a” started at “f”. The others are below.