"Everyone, I know that you have all just come from the bandit raid not too long ago, but it has come to my attention that there is a Labyrinth in that area that Carlos the Jabber was planning on exploring," Kassandra announced to everyone in the guild.
Over the last few days, a notice was put out, and many Adventurers and mercenaries flocked in to take part in the Labryinth expedition. Of course, Kassandra weeded out the nasty people whom she suspected would be a problem during the expedition, but a shit ton of people still were left.
The labyrinth had many, many treasures that could make anyone set for life. Anyone would risk everything just to get an opportunity to explore a labyrinth. But that great fortune would also come with tons of danger.