Heralds are a new unit introduced in Conquest Mode.
They are featured in Viking's Glory battle where they functions similarly to Loremaster with Runestone, Circle of Stones, and Sword of the Gods; studying Pillars of Glory. As Pillars of Glory contains inspiring stories of famed kings of the old, Heralds gather Fame instead of Lore. Additionally, their great sense of politics allows to gain influence throughout the viking community. However, it's more than often Heralda twisted least satisfactory parts of such stories to their favor.