gwydion2 wrote:analgesia wrote:a weapon with a 19-20x2 crit range will (roughly and not by much) do more damage per round than a weapon witha 20x3 crit range
I think you may be missing a key point in your calculations.
More than likely!

The complexity of hitting a defender and how damage is applied typically confounds me. I didn't do the calculations -- I used the NWN melee damage tool (which could be bugged, it will show calculations but it doesn't show enough to see exactly how it is accounting for crit dmg). It is limited in that it can only look at average damage per round as a function of the abilities/modifiers/crit specs for the weapons you specify and and the defender's AC.
Basicly, on the hits that don't do criticals, you still do normal damage. This is what Verg was getting at above.
Say you have 2 weapons, with the same base damage 'X'
1) has a 19-20 x 2 crit
2) has a 20 x 3 crit
You will roll 19 just as often as you roll 20, and we can ignore rolls below 19 which are the same for both weapons.
Weapon 1 - does 2X damage on a 19 & 2X damage on a 20
Weapon 2 - does X damage on a 19 & 3X damage on a 20
Total damage of 4X is the same from both.
I agree with what you (and Verg) state above, but how does the following come into play? Somewhere in the NWN manual, it states a roll in the crit range only qualifies for a critical hit (rolling a 19 or 20 in the case of Weapon 1, or a 20 in the case of 2). Once "qualified", one has to roll again with the same modifiers to see if the critical hit actually lands. If the second roll is a hit, critical damage is then calculated (by rolling 2x, 3x, etc) and applied. If the second roll is a miss, only normal hit damage is applied without additional critical damage (i'm uncertain of this -- see below).
My interpretation is that rolling a 19-20 for Weapon 1, or a 20 for Weapon 2 does not mean that critical damage is always applied. Maybe this isn't implemented? I've never actually verified it.
A second issue that confuses me -- does rolling a d20 in the crit threat mean you actually hit a defender with a high AC? Is it the first roll that determines if you actually hit? I.e., for a 19-20/x2 weapon: BAB + modifiers + [a 19 or 20 roll]. So a BAB of 5, a d20 roll of 20, and modifiers of 5 would give 30, which would mean a hit only if the defender's AC is <= 30? Because the first roll (20) was in the crit range, now go on to see if the critical hit is actually applied.
Or is it calculated this way? Roll a 20 to qualify for a critical hit. Immediately go on to the 2nd roll to determine hit or miss -- the 2nd roll w/ modifiers (say BAB of 5, a d20 roll of say 15, and modifiers of 5) would give 25, which would mean a hit only if the defender's AC <= 25. If it is a hit, now determine crit dmg. If it is a miss, then no damage.
Now where damage resistance comes into it, is if you can't easily hurt your opponent without a crit. For example, assuming enemy DR is equal to 1.5X
Weapon 1 now does 0.5X damage on a 19 and 0.5X damage on a 20
weapon 2 now does 0 damage on a 19 and 1.5X damage on a 20.
I think in this scenario, my PC would run regardless of whether his weapon was 2x or 3x.

Again, if the above system is in play, then it is not guaranteed to do 0.5x dmg or 1.5x damage when a 19 (2x only) or 20 (2x or 3x ) is rolled, unless there is a large difference between the attacker's modified attack bonus and the defender's AC.