Dig in the dark is a gas. Baby can you dig it?
Dig down far enough in the Forgotten Realms and you'll run into the Underdark. It's spooky and... well... dark. Usually the home to all sorts of creepy-crawlies, but not necessarily demons. Well, thanks to Gromph Baenre, Archmage of Menzoberranzan, you can now find bunches of demons down there, too. Err... good? Well, it's good if you're an adventurer looking for adventure, I guess.
Out of the Abyss is a new adventure path that's part of the grand Rage of Demons story line (you've probably noticed that it's cropped up in a couple places here on the page). Today's the day you can go pick yourself up a copy from local retailers or online. The adventure is suitable for characters of level 1-15 (I'm... not sure how it manages to be so wide a range, but I've not looked over it, myself).