In Curse Of Strahd, the Heralds had met without an official title, but rather as disparate adventurers with a common goal to defeat Strahd von Zarovich. To this end, they undertook many quests, relying on the experienced Ghalwin as their guide. During these adventures, they rescued and added the Vistani seer Ezmerelda D'Avenir as a party member, and restored Argynvostholt in the Lighting Of The Silver Beacon. This act infuriated Strahd, and Mormeros would sacrifice himself to save the party in their ensuing battle.
They later defeated Baba Lysaga in Berez with the help of Izek Strazni, who joined the group, and were responsible for the Silver Dawn Of Vallaki; this event was where the Heralds would declare their name. More quests and events followed, but eventually, the Heralds gained enough power and knowledge to confront Strahd directly. After the Crimson Dusk Of Vallaki, the party once more attempted to breach Castle Ravenloft, and finally managed to kill the Vampire.
Following the Slaying Of Strahd, the Heralds of Dawn disbanded. Tobias and Ajuni returned to the Material, looking to reflect who they were and what they had become; Ghalwin and Ezmerelda traveled the Umbral Realms, looking to help those in need; and Izek joined the now-free Jarmo Maulgrave and Ireena Kolyana in rebuilding Barovia, the old Pack members now reunited.