The spell is, at its essence, based on the idea of "Shout". Heck, originally it was going to have the [Sonic] Descriptor, but the actual damaging force behind the spell is the brain-crushing stupidity of it, not the force of the words.

[language-dependent] I agree with, and I think, since everyone seems to have a problem with the int damage being too powerful *save Debi*, I'll bring that down to a 1d4 instead. But in turn, I'm also taking it back to Bard 2.

And I think Evocation is probably a better school. Even if it is mind-affecting, the crux of the spell is a force that damages the opponent's mind.