The Keep of the Shadow Knight
The Keep was on the edge of the battlefield and it was owned by Knight Tyral.
The knight was killed when Brima struck the artifact. He rose several days later and went back to his keep where he dwelled for 350 years.
He killed anyone who got too close and he accumulated various undead over the years.
50 years ago a hero named Narder arrived and managed to dispatch the Shadow Knight out on the Witchlight Moors. Narder barely survived.
He settled the town of Sheywood nearby but never cleared the Keep. The keep sits off to the west of the town and is an eerie reminder of the war.
The Shadow Knight wielded the Greatsword called Heartblade