Mass Effect: PATHFINDER (New Worlds, New Aliens)

Vallun Rinai (Vallaian for "Hallow Planet") is an interesting concept. We can't classify this as a planet, because in reality, Vallun Rinai is a cluster of asteroids caught in the orbit of an extremely powerful star. Strangely enough, the civilization of Vallun Rinai live underneath the shell of Asteroids, forging towering cities of stone. The idea of horizon doesn't exist in this planet. If you looked forward, the land would curve upward. The powerful star that in the center of this "planet" is called Nirvai, named after the Vallaian god of light and security. Access to this planet is only achieved through a specialized gate that only opens via permission from travellers.

The Vallaians are short, rounded and wear a stone armor with glowing nodes on their body. This armor is designed to make the Vallaians heavier, resisting the pull of Nirvai. Their faces are slightly squished and rectangular, with two beady yellow eyes, no nose, and bald heads.

Because of the rocky, relatively inhospitable nature of Vallun Rinai, Vallaians rely heavily on trade to support themselves. They mine precious minerals and metals from their asteroids, and would trade them in for food, water, and other important resources. As such, they are very sensitive to when they are being cheated, and their sole form of currency is based on weight of objects. They also believe in a custom based on honesty, with merchants always telling the truth of their products and their prices. By not cheating their customers, they are promoting their customers not to cheat them. Or so conventional wisdom holds. There's currently no evidence supporting this technique.

With a heavy emphasis on trade, Vallun Rinai has become a trade port and his home to millions of citizens from various systems in their own cluster.