From the drivethroughrpg:
The adventure is suitable for a lucky mid-range party, a stupid high-level party or an exceedingly clever low level party. It is difficult, with a meaningful possibility of character death.
Players start in the town of Carrowmove, devistated by an unexpected flood, then travel through a drowned land where nature is turned upside down and desperate families cling to the roofs of their ruined homes, hiding from the monstrous products of a disordered world, through the strange tomb of an ancient race, to a profundal zone, hidden for millennia and now exposed, and finally to the Observatory itself, an eerie abandoned treasure palace, where they will encounter a pale and unexpected terror which will seek to claim their lives.
Should you find them, and defeat their guardians, the treasures of an ancient culture will be yours.
At the final point of the Observatory is a glimpse of another world.
The basic setup of Deep Carbon Observatory is there is a strange underground observatory (more on this later) that was hidden at the bottom of a man made lake. The man made lake was formed by a dam built long ago, perhaps to hide the deep carbon observatory forever. The dam has recently broken flooding everything downstream, including a bunch of villages, and for the first time in what seems to be eons, the deep carbon observatory is exposed.
On the surface Deep Carbon Observatory (DCO) can seem to be a bit of a linear adventure. It's divided into three main parts:
- The beginning at the town of Carrowmore.
- Travel upriver
- Exploring the Deep Carbon Observatory
The Art and Layout
- Best quasi linear adventure I've ever read. Really nails the format.
- Rival adventuring party an awesome idea that can really turn things up to 11. First time I think I've seen it used so well.
- Actually making an adventuring site feel ominous and kind of terrifying.
- You want to run a cool medium length adventure that's dark but also weird and humorous at times (there is a giant platypus monster) and not just grim-dark.
- You like adventures where you're going to have to make moral choices in tough situations.
- You're new to DMing. I think it would make a decent starting adventure. Make sure you read it over maybe twice but it's general linear journey is easy enough to grasp for you and your players. It's going to get a bit messy but that's part of being a DM.
- I think now, after the kickstarter, it's only available in PDF. EDIT: apparently you can buy a print version here while supplies last.
- It's not suitable for all ages.
- It does take some time to fully read and digest although is definitely laid out nice enough to run at the table. You will just want to read it all first though.