I found Tang's book and then ran through Destard, all levels, and didn't spot anything. Granted, it was like slogging through cement, but I didn't spot any yellow NPCs or anything obvious locked down. No cracks in the wall, etc.
Made a screen shot of the word search and yes, Destard is the only word I can pull out of it either.
Was going to look further but the server went down for maintenance about 12 minutes ago. Seemed like an odd time for server maintenance though; thought maintenance usually happened like four or five hours before now.
Here's the little word search in Tang's book.
Maybe there's another word buried in there besides "Destard."