Originally Posted by The Doctor
I've used so little Illusion magic that I haven't even seen a Frenzy spelltome yet, to be honest. Or if I have, I've entirely forgotten it. I pretty much only use Destruction, with the occasional Magelight from Alteration when I'm in a dark enough area (Blackreach, for example).
I *think* Riverwood has a frenzy spell you can buy.. if not, definitely Whiterun mage.
I'm with stoffe
on the use with Frenzy. I never really used it much in the other ES games, but something about it just feels right with Skyrim and it's my goto, default spell I have armed at most times (could also be that I'm a squishy rogue so it helps thin the numbers)