Ghostlight Marsh (Part of Giantslayer)

a swamp to the northeast surrounding the confluence of the Kestrel and Esk rivers.
Ghostlight Marsh is a vast tract of swampland along the shores of the River Esk. The current border between the Hold of Belkzen and Lastwall runs through the swamp. Both orcs and humans avoid the marsh due to countless tales of strange, floating lights.
Lastwall’s northern border with Belkzen has been pushed back multiple times over the centuries. When the second of these borders, Harchist’s Blockade, was overrun by the orcs, some stood resolute, seeing themselves as protectors of the land. The Council of Thorns, a militant druid circle who despised the orcs’ defilement of the land the creatures conquered, attempted to stand their ground. While the druids’ fight was valiant, the Council of Thorns was eventually driven back to the swamp and defeated by the orcs.
Faced with sure defeat at the hands of the conquering orcs, the druids of the Council of Thorns made a final stand in the swamp, sacrificing themselves in a bloody ritual. As the druids’ dying bodies slumped into the muck, vengeful willo’-wisps rose from the marsh and drove the orc army out of the swamp. These cruel and capricious aberrations have guarded Ghostlight Marsh from intrusion ever since.
The will-o’-wisps of Ghostlight Marsh are actually the reincarnated druids of the Council of Thorns, who still remember their former lives.