Re: Promise of Destruction not starting

Cassandra book, may actually reference a book Cass gets DURING her quest.  And some quests have multiple choices or endings so I can easily see more than simply 1 or 0 being required.  I haven't played in the editor for DAI, but I remember the ones for Mass Effect and they could be very confusing if you didn't know exactly what you were looking at.

If you haven't done the wartable quest to find the seekers, then her personal quest will never trigger, as it is one of the requirements of it from what I can tell. 

https://dragonage.fandom.com/wiki/Locate_the_Missing_Seekers 

Look into what needs to happen to get the wartable quest, and see if you can get it triggered.