Scott Taylor from Art of the Genre has created a fantastic line of adventures in his Black Library collection. Among them is the Sins of the Three Sisters... they are a set of adventures that takes you through some pretty straightforward dungeons where you encounter the sisters one at a time, each now a villainous monster. They are great gems to add to any D&D campaign and I have done just that for my own Wednesday night games!
Here is my imagining of the Eryn'Jathru the Bone Sister! I hope you enjoy and check out the Three Sisters adventure!!!