The Rise of the Companion
The Rise of the Companion — in 1444 DR, a second sun descended over Elturel, and it has hung there ever since.
As Elturel tells it: the city's leader was secretly taken over by a lich, who corrupted the minds of the other officials and bent the city toward his dark agenda. When his influence spread beyond the walls and was discovered, an uprising rose — and was hopeless; the people had neither the numbers nor the power. Then Thavius Kreeg, a man of an old Elturgard family from the outlying regions, came to the city and summoned the Companion. It descended from the sky, its light — death to the undead — broke the lich's grip, and the city was freed.
Nobody knows what the Companion is or how Kreeg summoned it. Kreeg has been High Overseer since, steering the city toward the light and building up the Dawnbringers and the Hellriders. Elturel's Dawnbringers speak of the orb as a blessing that "feels like the Morninglord's own regard." Nuts Deep sits at roughly the edge of the Companion's reach — about the limit of where undead can survive near the city.
The history was told to the party by a Dawnbringers Banneret (S53).