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:Banish. < Skyrim: Magic: Magical Effects. Enchanting description: Summoned Daedra up to level <mag> are sent back to Oblivion. Banish sends conjured daedra back to Oblivion. Simply put, it makes them disappear. Therefore, it either pushes the daedra back or results in a one hit kill.