Okay, this has been bugging me a bit, so I'm finally gonna ask. What benefit does reducing a targets INT have on most targets?

I mean, obviously it will reduce the amount of damage done by spell casting targets (last boss of the Vault comes to mind), but is that it? Do certain special abilities that do elemental of non-aspected damage (like say a dragon's fire breath) get their damage reduced even of the creature using it attacks with physical melee hits most of the time?