Chapter 1: The Green Dragon Inn
Right across the street from the Yawning Portal Tavern is the Green Dragon Inn. A place where you can actually get some sleep compared to the Tavern, which is 24 hours full tilt rowdy. Not the Green Dragon, it's for sophisticated folk. And that's where you've been invited to meet a wizardly old man calling himself Hal.
"Welcome friends! I have a grand business proposition for you. I've sent this letter to lots of interesting adventurer folk, and you're the ones that showed up. Most visitors to the Yawning Portal are content to swap stories by the hearth, but sometimes a group driven by greed, ambition, or desperation pays the toll for entry and descends the well.
"Most don’t survive to make the return trip, but enough come back with riches and tales of adventure to tempt other groups into trying their luck...and that's us friends! I have some magic potions that will automagically make you powerful enough to succeed in whatever path you take down in the dungeon. All I need from you is for you to do it! Please, teamwork makes the dreamwork, get to know each other."