Nchulem from AFFresh, according to the quest dialogue you get the book in, has a secret. It actually has 2 secrets, and the first line is a tiny hint on how to figure both of them out.
SECRET 1Edit
By putting the first letters of all sentences together, you get:
NCHULEM-MECH-NUL-AFFAISN-OTHIIIN-GBUTPSIIII
Which can be read as:
Nchulem = Mech Nul (Numidium), Affa is nothing but PSJJJJ
SECRET 2Edit
By putting every 10th word together, you get:
you kids era the best seriously elder Scrolls devotees' equal finest devotees no role here the secret it hides is you made it's up shoulders of giants man Morrowind deserved more
Which can be read as:
You kids are the best. Seriously, Elder Scrolls devotees equal finest devotees. No role here. The secret it hides is you. Made it up. Shoulders of giants, man. Morrowind deserved more.
A very nice message from Douglas Goodall. Thank you for your work on the Elder Scrolls!