The Oathweavers emerged in the Riverlands, initially known as the Sinners, and swiftly evolved into a formidable criminal organization on the peninsula, rivaling others in influence and power. Forming alliances, they seized control of a vital smuggling route and forged a pact with the dragon of Ashantaruxx, solidifying their position as a formidable adversary to the Riverlands' kingdoms.
In the wake of a devastating war, the Riverlands faced invasion from the formidable forces of Venlanders, originating from the distant Niffleheim. This dire threat prompted a pressing need for Riverlands to unite under a single banner, leading to the resurgence of the Demon King and his reclamation of his former empire. With the aid of advanced technology from Midgaard, the Riverlands nations managed to repel the Niffleheim armies. Now united under a common rule, they prepared for a more devastating incursion from Undertethys in the form of Ascal the Reborn, the Unforgiven. Ascal, who not only rebuilt himself but also took command of an Icon, Nephilim, unleashed destruction upon San Cristobal and its surrounding cities.
Once again, the Oathweavers were summoned to defend the Riverlands, this time joining forces with Randal Highcastle, a renowned hero of the empire. In a selfless act, Randal sacrificed his life to vanquish the Icon, while the group ventured to confront Ascal in his lair. Following the tyrant's defeat, the individual members of the group either went missing or departed from the Riverlands, but their organization endured, continuing to operate within the region.