From the PDF introduction
A Web Enhancement for Secrets of Sarlona
Introduced in Player's Handbook II, character themes are a way to add specificity and detail to your character's chosen class. Especially in Sarlona, such background elements can help inform your character creation choices and add depth to your roleplaying. The Sarlonan milieu can be very different indeed from Khorvaire. The information below provides Sarlonan-flavored themes for each of the core character classes, plus -- naturally -- the four basic psionic classes. Suggested backgrounds are also included, and further information can be found in the Sarlonan Backgrounds section.