In the WotBS 3.5 HB (page 53), it says, "Rescuing  and  healing  him [i.e., Diashan]  is  likely beyond  the  powers  of  the  heroes  at  this  point, but  when  later  he  is  freed,  Diashan  can  provide full information of the Shahalesti plot to destroy Innenotdar."  I've done a search of...