Prisoners of the Crimson Crystal

From the publishers blurb:

The wedding of Baron Duncan was meant to be a day of celebration and joy for all his subjects, as well as for you, brave heroes, called to witness the event. During the ceremony, however, just before the fateful ‘Yes, I do,’ Xanaxarius, the bandit-sorcerer known throughout the surrounding lands, broke in with his horde of followers. You remember very little of what happened next: the cries of the almost newlyweds, the dark and arcane words of Xanaxarius, and the red flash that engulfed you and the other guests…