I believe I worded that wrongly. Here goes a better (i.e. actually correct) explanation:
There is an Anti Resist test (roll) before any resists take place against a gem effect. If that test succeeds, then no resists can occur. Your chance of succeeding the Anti Resist roll is, of course, determined by things like the effect of that weapon.
So let's say both people have the weapon. Person A has a Do Unto gem in place, person B is casting something on him.
Case 1: Person B casts a DD against Person A
In this case, person B does not get any extra Anti Resist bonus when the gem is cast because it is an attack, and the weapon specifically says it doesn't help attacks. Person B, however, if their Do Unto % chance is triggered then the gem fires, and it tests to see if their Do Unto will be resisted: First they roll their Anti Resist for that effect based on the weapon's bonus and any other bonuses for anti resists. If that roll succeeds, then there simply are no resist checks done. Note: It does not matter what their CNC is or what the enemy's CNT is: Anti Resist is the % that is listed, regardless of stats. So you could have 0 CNC and you'll still have a 33% chance of avoiding all resists prior to them ever being checked if you use that weapon.
Case 2: Person B casts a DoT against Person A
Same as before, except person B also has a 33% chance from the weapon that their DoT will not be resisted. Anti Resist does NOT protect against mirror or reflect effects, however, only against actual resists. The resist % is based on caster CnC and defender CNT and only gets checked if the Anti Resist roll fails.
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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z)
Probability
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