I can probably do a constant mana drain much easier than a mana decrease. I'll look into it. Lemme get this stuff working first. Sorry to intrude on the thread, too.

Doesn't relate to destruction magic, but it does relate to balancing the mage.
Penumbrel, have you had any issues with casting spells? In my testing, I can change the durations of conjuration spells, but they aren't castable ingame. The description properly changes, but it will not allow you to actually cast the spell. It does however allow it to be equipped.
Edit: Huh. Some work, some don't. Atronach summons don't work, but the familiar does. Weird.
Edit2: Got it working. Never mind. Mistake of my own making - a cross-check with the original files showed where the error was.