I've tried changing the following:
DefenseFactorDiff
AttackFactorDiff
LifeFactorDiff
DamageFactorDiff
Enemy_armor
Enemy_weapondamage
Enemy_spelldamage
I also changed values on these:
MP_damage
MP_combatvalue
MP_lifeHP
MP_EShieldHP
MP_armor
The only ones that had an effect on the "last opponent" window were DefenseFactorDiff, AttackFactorDiff and LifeFactorDiff, where the HP of the last enemy doubled and the values for "opponent-chance to hit; player-chance to hit" were accordingly different. All other entries had no practical result in the stats displayed. I put double the original on the value correspondent to Niob on the first group (rightmost one) and doubled the amount of the first (leftmost) value on the second group, tested it with a level 200 BFG seraphim from the unskilled chars on the download section.
Weird... Shouldn't I be seeing different results? (Yes, I had some spare time today, hurray!)
PS: Fun fact as to what ZRareExpectation is concerned. I changed everything from tier 11 to 15 to 1000 and everything from tier 00 to 10 to 1, did a Guardian run in Niob with the seraphim and got three legendaries. Alas, they do drop!
---------------------------------------------------------------------------------------------------------------//---------------------------------------------------------------------------------------------------------------
Ok, so a few corrections here as last night results' were bugging me. So I changed these values from 1000 to 1 and then to 10000:
MP_damage
MP_combatvalue
MP_lifeHP
MP_EShieldHP
MP_armor
Yeah, they work as expected and related. With 1 it was one shot one kill, with 10000 I could barely kill anything with so much HP that any mob had at level 200. The important thing to note is that none of these values change the stats on the "last opponent" window! So yes they do work, it's just that these changes aren't displayed anywhere. Whereas changing DefenseFactorDiff, AttackFactorDiff and LifeFactorDiff will update the stats on the "last opponent window" these MP lines won't do it. So that's clarified. Is changing both necessary? I don't know, as I have no idea if one overrides the other (MP_lifeHP and LifeFactorDiff for example) or if they work together and multiply themselves one by the other, which would be hard to control and could get out of hand very easily.
Then I thought that maybe I screwed up in testing Enemy_armor, Enemy_weapondamage and Enemy_spelldamage as well. So first I changed the fifth value to 1 and afterwards to 10000. Results were, well, few to none?! Then I switched all five values in those three parameters to 1, then to 10000 then to 100000. In all instances I couldn't really notice a difference in terms of damage inflicted to and by mobs. I have no idea why but I've changed these values in several different ways and nothing seemed to change.
As for DamageFactorDiff, I still have no idea what it does... The MT and NPC values I didn't touch, nor did I mess with AllEnemy_lvl. And that's it. If someone cares to present some aid or clarification by all means, do so.