I'm suprised I haven't seen anyone else mention it, but all items and feats that block a percentage of damage don't work at all!
i.e. Tougness level 2 and those items that say "immunity 10% slashing". Note that "damage resist 5/- slashing items seems to work okay"
I was wondering how a certain pathetic guy in a certain duel was doing lots of damage to me with a pathetic vibrosword, despite me having toughness 2, plus gauntlets and armour that block slashing damage!
At first I though they must simply not stack, although my armour should still be giving me 30% reduction on its own. So I looked at the combat logs.
They showed the proper drops in damage (though I didn't work out if items should stack), with 4 or 5 points being deducted from the "base damage + str mod". However, the red numbers displayed onscreen didn't include the deductions and equalled the "base damage + str mod".
Maybe this was just a display error in the 'red numbers'? But no, I checked my vitality points before and after the hit, and they matched the red numbers.
So, the combat logs show the correct damage amounts, but they aren't applied. The % damage deductions mentioned in the logs aren't actually used.
I haven't tested this for grenade, mine or force damage yet, only for melee/shooting damage.
If a dev reads this, can they make sure this is included in the patch.
A huge amount of items are broken because of this bug.
Until this bug is fixed, I urge everyone to ignore % damage reduction items (like ballistic shielding overlays) and instead favour those which remove an exact quantity of damage from each hit (Mira's jacket does this). I've wasted a lot of cash on items that don't work!