Dungeons & Dragons Announces Arcana Unleashed: Deadfall, New Adventure Book Featuring Red Wizards of Thay

[Henadic Theologian]

The nefelsheen is an appropriate boss for 11th level characters (I just used one recently) so my guess is the adventure tops out there abouts.

Or starts there & goes to 20.

 

[Reynard]

Or starts there & goes to 20.

Possible but, again, we just had one of those. It would feel weird if the first two adventures for 5.5 were high level when we essentially had one (DoMM) for 5.0.