"While you are exploring the cave for further treasures and hidden passages, you passed easily the babbling of Thaldurin about the rare geological structure of the cave and ignored him running around and making sketches.
Later however, you realize that you don't hear his mumbling and scratching anymore and he left somehow the cavern. However, you find a small handwritten note on the back of an ex-Fireball (e.g. already used) scroll:
"Went to publish recent findings to the Academic Journal of Adventurers. Don't wait for me, I'll be back following the decapitated bodies of your enemies"
Have a great time next week, see you in September!