The Test of the Faithful - 7
You gather your gear, lock the gnomes in the semicircular room, and head off to the last of the challenges, hoping your lack of rest will not have been a bad decision.
You get to another of those dragon doors, press the orb, and it rises. As you step across the threshold, the cube lights up the last light, "EVIL," and you step into another room with a dragon pedestal. In the maw of the dragon is a red ruby.
This room is circular, about 40 feet in diameter, and is unadorned. The only exit appears to be the way you came in.