A powerful dragon called Alderin, the all devourer, a time traveling dimensional warping dragon that fucks around and tries to destroy anyone that could possibly usurp his position of power in all time streams.
You, the Dragonborn, have had multiple incarnations, of the exact same scenario, of different races, classes, and specializations, and all of them died. Your final incarnation is you, the player, and his unique race/build/class combination. You join multiple factions and on a time spanning war against the godless devourer and master of time, you slay dragons and learn from ancient dragons their powers unique by birth. These are called roars, or shouts. Some dragons in the age before their mass genocide, ancient and old, teach you their history, and it mostly consisted of mutual peace, which made Alderin’s betrayal a surprise and a success.
Aderin being the Dragon of Time who betrayed his kind after seeing his own death many times over. His anxiety and insecurity drove him mad, and he became who he is now. He was the youngest without someone to confide in his own mortality, so in that, he now lives forever, making it certain nothing will kill him as long as he’s proactive enough.
The entire game is the endless conflict between the Dragonborn and Alderin, and the duality between the two and coming to terms with mortality, and rest. The Dragonborn hasn’t been allowed to really live or die, endlessly reincarnating to solely end Alderin. Alderin, foreseeing all of time and having immense power at a young age, has never lived at all because he’s too busy going insane trying to prevent his own demise. They’re 2 sides of the same coin- the most human dragon, and the most dragonic man. One affected by ultimate pathos, and the other of ultimate ethos. Alderin who is right to feel the way he is, scared of something as certain and horrible as his death, and Dragonborn being ethically sound to end the life of a destructive being who seeks the death of others to only prevent his own.
It’s a tragic and ironic story.