Back on the original subject, I guess Neural and I will start on this when we get to a somewhat later phase of the project, like when we start finalizing some of the maps. That way, we won't have as much changing.

Could the ending involve the Sons of D'Sparil plotting to destroy the crystal barrier that kept the Serpent Riders and their demonic brothers out of our universe?

The Hexen II manual states:

'According to the steppe dwellers, the universe is filled with a clear but viscous gas known as Aether. The Aether is to the universe what water is to the ocean; it holds the stars in place, and fills the void between them. A great crystal sphere encircles the Aether, preventing it from escaping. Beyond this celestial sphere lies darkness: the very darkness we see when the sun sinks below the horizon. This darkness is an uncharted land of powerful demons and evil spirits, each slavering to crush our petty worlds, but prevented by the great crystal barrier.'

Could be a good idea. . .