Before leaving the Library Aeshen makes a point of finding out where the patrons of the library like to spend their free time - limited as it is. He pays careful attention to where they like to eat and drink.
"An excellent suggestion Ella. If you would all be so kind as to meet me outside the Master's house tomorrow morning ready for this trek I will see if I can glean anything else."
Aeshen heads to where he was directed and spends the evening buying drinks, flattering, and doing whatever else is necessary to learn every shred of information available about rattlings (particularly mutant ones), catacombs, maps, and anything else they might need to know for this trek. Aeshen takes his leave of the establishment after the last scholarly patron calls it a night.