You're not there yet. But since this campaign began I had intention of putting you up against Acererack and his Tomb of Horros. At the time I figured I'd have to design the adventure based on old adventures from the ground up. But as luck would have it Wizards is releasing it. Whether it will have the grand scope that was part of the Return to the Tomb of Horrors 2nd edition adventure is uncertain. If there is only the Tomb, and not the Fortress of Conclusion, then I'll have to continue where the new book leaves off.