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Guard damage reduction
Guard is a great defensive skill, it reduces damage taken by subtracting one from enemy's pDIF. That means it turns criticals into non-criticals, and can greatly reduce damage from normal hits. pDIF ranges from 0 to ~2.46 and is capped at those values so the % damage decrease from subtracting 1 varies.
However, guard seems to have a higher, non-zero, lower bound, so if you are already getting hit for just ~15 for example, your guarded damage will also be just 15 (no change), and not 0 (you can see this in the video with 7dmg after phalanx). I don't think that's ever mentioned in discussions about guard and should be tested more to figure out the exact lower bound effect.
On average the damage reduction tends to be about 75% (for example from 80 normal damage to 20 guarded damage, or from 200 to 50). Where does the number -1 pDIF come from? I am not really sure to be honest, it's never linked to any reference or test. However it at least matches its effect on critical hits damage (which is probably where it came from, since critical hits add +1 to pDIF, and that's well tested and easy to verify), so it's probably a good assumption, however as I said it doesn't explain well situations where normal hits and guard hits are capped at the same non-zero lower value. One possibility since I observed this mostly on chigoes is that it's not something about guard but something about chigoes, for example if they have an extra +15 damage to their hits even when their pDIF is 0.
Please point out where this says anything about guard skill having an effect on the mitigation.