Actually, after Lance slew the Warwolf, the heretics' activities began to wane. Once the Order of Knights from Bastia was routed, they vanished completely.
The Ascension Sect wasn't foolish. They had originally intended to use the Warwolf and Bastia's Order of Knights to suppress, if not destroy, Hamlet's growth.
But now, the Warwolf had failed to kill Lance, and the cavalry had crushed the Order of Knights.
With Lance, their top fighter, and Hamlet's only mobile force now free, the Ascension Sect understood—albeit too late—that their opportunity had quietly slipped away.
Thus, for the people of Hamlet Town and the outposts, the heretics' mysterious appearance and equally baffling disappearance left only devastation in their wake. Yet, they had held their ground. The bodies lying on the ground were proof they were worthy of their Lord's trust.
