The Mede Dynasty saved Tamriel from Umbriel. Facing off legions upon legions of undead which assaulted the very walls of the Imperial City, devastated most of Black Marsh, all the while souls were taken and used to fuel the floating city, used even in their food. So, take your pick. Death by Daedra or No after life, but to be eaten in some twisted manner to please the stomach of a Lord. Skryim rarely remains united for long. Hence how Tiber Septim was able to take the Nords easily, due to their conflicting nature, they fight amongst themselves between clans and Jarls. So you also have the chance of dooming Skyrim's citizens to petty violent outbreaks, skirmishes between Jarls and Clans. For the province to descend into chaos, while Cyrodiil faces three provinces of the Aldmeri Dominion. If they lose, the Aldmeri could sweep into Skyrim. The Nords fearful of magic, and having no Battlemages, stand little chance against an army of many magic users. Fireball vs Axe dragging pelt wearers as the Nords are so politely referred as by other parts in Tamriel.