Numion said:It most certainly does. Let me formulate:
Without the feat you'd succeed on X results out of 20 (=x/20), depending on the DC. With the feat, you'd succeed on X+2 results out of 20 (=(x+2)/20). Now the probability for succeeding because of the feat is
P(succeed with feat)-P(succeed without feat)=(X+2)/20-X/20=2/20=1/10
Now X was the only thing dependant of spell DC or save bonus, and those got cancelled out. This is conditional to the DC being within save bonus + d20 roll range, which isn't unreasonable.
I can't understand why it's difficult to understand that hitting the 2 numbers on a d20 is always 1/10 probability, and only when you hit those two numbers does having the feat matter.
Great. You found yet another way to say "This feat adds 10 percentage points to your chance of saving.", which is what has been established pages ago, and not what we're talking about.
Now here's a simple example of why you're wrong:
You have to make a DC 20 save and have a +9 save modifier. There are 10 rolls that result in failure. You take a feat that gives you a +2 on your save. Now there are only 8 rolls that result in failure. You no longer fail on 2 out of 10 roll that you would have failed on before. 20% of the rolls that would have failed without it are now successfull.
You either don't understand the math, or don't understand English well enough to see the distinction between "It makes you succeed on 1/10th of the rolls you'd have failed without it" and "It adds 10 percentage points to your chance of success."
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