Aros is another wild, frontier world. The planet has an extreme tilt, resulting in wildly varied seasons. A few months can cause the landscape to switch from a frozen wasteland to a sweltering desert. This also leads to extreme winds and storms. The weather is your worst enemy on this planet. And the locals have learned to take refuge in the many caves of the karst landscape.
The various tribes worship a pantheon of gods, each representing a different weather or seasonal phenomena. However, Ministorum missionaries have surplanted the Emperor in place of their Sky God. Only the strongest can survive the harsh environment, and they make for impressive soldiers.