Rhiv and Therrien head to the section of the library where they can research information on Laele, spider goddess of the Drow. They learn of some of the legends surrounding her past, and a few of the official rituals used in her worship. But, it appears that any tomes dedicated to knowledge of Laele simply haven't been written yet, at least not by any surface-dwelling people.
The duo then move to the area dedicated to the history of Arazi. Rhiv is able to compare a map that is fairly current with a more speculative map of what the continent may have looked like many hundreds of years ago. The current map lists a number of major cities scattered across the land mass:
South Blackwall
Cities: Port Willow
East Blackwall
Cities: Port Charlotte, Redwall, Riverlake
Eurin
Cities: Hanover, Froonshire, Noonick
Findor
Cities: Welkinburg-Lowerton, Ramsbottom, Arq’s End, Deathrot, Highview
Vegonius
Cities: Fargate, Northsea, Pela’s Rest, Plainskeep
Il-Robezas
Cities: Wargford, Delgos Tor, Snot’s Hold, Wayfare
Ruwhad
Cities: Merrick’s Crossing, Kurgh, Ironbridge, Headwaters
By comparing the old map with the new, the two of you guess (and, based on the reliability of the information, a guess is about as confident as you can be) that Noonik, Welkingburg-Lowerton, Deathrot, Delgos Tor, and Headwaters are all potentially built on or around ancient ruins. There could be others, but, these are the ones you zero in on given the current information.
OOC:
Alright, last chance to say goodbye to your escorts, and chat about anything together before you head outside and meet the King's guards.