You have no idea the types of scripts I'm talking about...Bwa-ha-ha-ha!
Seriously though, I think I misspoke when I said every item - I meant every weapon.
Why? Immunity to weapons, including all of the FRUA stuff, plus protection from missiles (normal), immunity to piercing, blunt or cutting...not to mention, add in "half-damage" anywhere I use immunity.
I think your idea will not require any scripts on items, but rather will be a Special Ability given to PC, NPC or monster.
In the new version of DC, we can attach scripts to all databases, which also are now updated dynamically.