In Oblivion, casting Destruction spells always got you detected.
So, would you like some kind of "stealthy Destruction magic" for a mage-assassin type character?
Already in. Use Enchantment magic to add Destruction effect to nice stealthy backstabbing blade, bow, or arrow. Stealthy magic attack, done. :thumbsup:
And no- spellcasting is, and should remain, a noisy affair.