An oratorio is a large-scale piece of music for choir, orchestra and vocal soloists, which tells a story without staging or costumes. Most oratorios are based on stories from the Bible, a source that Handel's English audiences knew well.
Enthir is a Bosmer sorcerer and merchant found at the College of Winterhold, and has connections to the Thieves Guild in Skyrim.
Skyrim:The Aetherium Forge. The Aetherium Forge is an ancient Dwemer forge, guarded by several Dwarven automatons. Access is gained during the quest Lost to the Ages via the Ruins of Bthalft.