Blood of Dragons:
There were three dragons involved in the conquest of Brevoy, not two. The two reds at the Valley of Fire were both females. But their male mate was close at hand—wearing the human guise of Choral the Conqueror. House Rogarvia carried the blood of dragons in their veins, and in the end it consumed them all.
The Conqueror’s Debt:
Choral the Conqueror made a pact with otherworldly forces to obtain not only his vast army, but also the aid of his red dragon allies. The disappearance of House Rogarvia is the result of Choral’s debt finally coming due.
The Next Earthfall:
Skywatch was built as a lookout and warning post against disasters such as the Earthfall, and the reason the Rogarvias have vanished is the observatory has detected another such imminent threat. The people of Skywatch huddle in shelter waiting for the sky to fall.
Return of the Conqueror:
Choral placed the care of Brevoy in the hands of his descendants and then departed into the depths of the Gronzi Forest, promising one day to return. The Vanishing is a sign the Conqueror’s return is imminent, and he wants his kin either out of the way of his armies, or just out of the way of his return to the throne.
There is tell of a mad hermit that stalks the southern woods. He is said to talk to beasts and live in a hollowed out tree
A brutish hill giant has been seen wandering the southern Kamelands. Give him a wide berth (or a stiff drink), and he’ll leave you alone.
A tribe of violent lizardfolk led by a lizard king who talks to the spirits of his dead ancestors dwells deep in the southern swamps.