Upon further investigation I have found this:
Your diplomatic mission from Ambrosia arrives at [295|-165] in Perrigor , and find it buzzing with debate and speculation, scientific demonstrations and learned lectures.
They find it hard to understand most of what is said. But they suspect that clever diplomats - such as Advanced Spies - would be able to learn a lot from these philosophers and scientists.
I have over 50 crafting recipies researched in this town, including a number of bows.
From another town with advanced spies sent and quite a few bow researches done:
Your Spies are inspired by the many debates, lectures and demonstrations in the courtyards of the Temple of Reason. Many of the ideas confirm the understandings of your own wisest people, and your diplomats enjoy the opportunity to relax here.
They suspect that diplomats from less well educated towns than yours would learn a great deal here. But coming from such a well-schooled settlement as yours, they do not learn anything new.
So, this may not be a location that offers any additional insight on the Elven Spirit Bow. I am sending a seasoned commander with a retinue of Trueshots to see if they may learn anything else.