BBEG alert
I'd like to call everyone's attention to a ready-made adventure hook. The characters in the recently concluded
Curse of House Thimbrall adventure, having foiled one project of a high-level necromancer, have started talking about taking on the evil wizard directly. They've been persuaded that this BBEG is a bit too BB for now, but in the intermediate future, after they've had a chance to advance a bit more, they might be interested. They had some assistance from his apprentice, turned with the help of a
psionic charm, so they know where to find him and a little about him.
In a nutshell, his name is Xyran, and he carries a grudge, even an inherited grudge. (The just-finished adventure revolved around a curse his grandfather had placed that he was guarding.) Animus, who started the adventure, intended him to stay in the background, and so never worked out the details. I finished the game when Animus bailed, and I imagine the apprentice (Gerald) told the PCs what they need to know about him. I didn't spell out everything Gerald said about him, in order to leave a future DM the flexibility to fill in the details, so if you'd like to run an adventure around Xyran feel free to assume the House Thimbrall PCs have some starting information of your choosing.
I may at some point in the future prepare the PCs revenge, but I'm not making any commitments, and I certainly don't feel I own this BBEG. So, if anyone is inspired, feel free to develop a "settling scores with Xyran" adventure, and run it some time in the future when one or more of the PCs are available. The characters involved are: Boog, Ridik, Kamdar, ao'Thuir, Levin, Jann.
I'll post an item about Xyran in the reference thread, but I just wanted to call your attention to the possibility.