The more and more time I spend trying to help solve this damn cypher the more and more it ends up being a repeat of Niobe Labs. A cryptic riddle/puzzle in Destiny 2 Black Armoury that was missing vital information leading to a solution for the 7th level. Bungie had to release a clue in order to move the people attempting to crack it's secrets along due to the bug.
Hey. Sorry for the late reply on this, we wanted to make sure to not communicate something incorrectly.
The last cipher riddle is currently bugged and cannot be completed. We have a fix for this planned to go into the game next week Friday, with the Tidal Basin patch.