A One-Round Adventure for 4th - 7th Level Characters
Crimson Codex Faction Adventure 5
From the introduction:
The Crimson Codex was built from the ashes of a much older and widespread organization of powerbrokers and kingmakers, dating back to before the unification of Khorvaire by King Galifar I. After the organization's lapse, which allowed the Last War to occur, the remnants of the group reformed under the leadership of Ohnal Caldyn, a powerful adventurer and collector of ruminations on the nature and content of draconic Prophecy.