Defeated, his army destroyed and scattered around Middle-Earth, now the Dark Lord could only wander in the Void waiting for the Dagor Dagorath where he would be summoned to fight in the Battle of all Battles...or so he thought, as an admirer of him gave him a second chance to restart in another world...

Defeated, his army destroyed and scattered around Middle-Earth, now the Dark Lord could only wander in the Void waiting for the Dagor Dagorath where he would be summoned to fight in the Battle of all Battles...or so he thought, as an admirer of him gave him a second chance to restart in another world... This is a crossover where Sauron gets summoned in Re Zero