This compilation was only available through Bundle of Holding in Dec. 2015.
From Bundle of Holding:
The Prince of Shadows, the mysterious and untrustworthy Icon of the Dragon Empire, is calling in his markers. To repay their debt, the heroes must steal a powerful magic item for him, the Darkskye Diamond. The attempt spirals out of control, leading to high adventure.
For the first time anywhere, this 171-page supplement collects, updates, and expands seven modules from the popular first season of the Pelgrane Press 13th Age Organized Play program. This compilation includes extensive new text that lets you play the module sequence as a single campaign. Whether you're looking for a one-shot adventure for game night or a full adventurer-to-epic campaign, Diamonds and Shadows has you covered.