The Deserta Vasta is an enormous desert on Ishtar, which has spread all over the north of Magnasia. It was formed when a planetoid from the Wamana universe entered the Ishtar System during the Merging. The planetoid's gravity nudged Ishtar off course, leading the planet to spin uncontrollaby away from its star. This incident will eventually render Ishtar uninhabitable. Deserta Vasta is a cold desert, with temperatures often going below -20 degrees Fahrenheit.
Luckily, the Salsenes discovered FTL travel before the planet was covered in desert. They rescued quite a few native species from extinction.