Alduin, or the World Eater as he is known to the residents of Skyrim, is an immensely powerful Dragon. He is depicted as a malevolent force who destroyed the previous world in order to create the current, and the Nords believe that his reappearance heralds the End of Time. He claims to be the Avatar and First-Born of Akatosh, and is the brother of Paarthurnax.
Originally banished through the use of an Elder Scroll, Alduin’s return to Nirn coincided with the appearance of Dovahkiin, or “Dragonborn.” The Main Quest of Skyrim features Dovahkiin’s struggle to free Skyrim from Alduin’s grasp.
His name separated in three is Al Du In which stands for “Destroyer Devour Master.”