Tythusian Multiverse

In Omniverse 65, many dead multiverses float and collapse endlessly for their laws of physics. Not so for the Tythusian Multiverse. Once ruled by two empires, that of Tythusia and the Protector's Civilization, it is now a maddening and hateful plane.

What happened
Rising tensions in the year 839399 YFTF (Years From The Founding [of Tythusia]), saw an apocalyptic war between the Protector's Civilization and the Tythusian Empire. In the end, Tythusia lost, and the Protector's forces withdrew. In their bombed-out cities, the Tythusians executed political prisoner after prisoner. This went on for some time, even as Tythusia neglected its economy and myriad alien species. What followed is murky, as only one report has been found (and even then, it is not reliable), and the civilization disappeared nearly instantly.