2. I didn't say it right, I mean it means patching all of the places where damage can be taken, a long research period to identify these all, and it overlaps with other damage affecting patches.
Let's see:
The game lacks percentage-based weapon and creature physical damage resistance - that's the effect to be introduced( I was wrong about general damage resistance - ain't no such thing in Oblivion(except difficulty slider, of course)). I believe there's a quick elegant way of application. Standart Morrowind damage formula is: Damage * Damage / ( Damage + Armor Rating ). It should be changed to: Damage * Damage / ( Damage + Armor Rating ) * ( 1 - coprus_resistance / 100 ) since it's actor's, not armour's resistance to physical damage, thus reduction through Armor Rating should go before resistance through effect.