Suppose your PC is blinded, lacks the blind-fight feat, and wants to smack something. Doing so requires an attack roll, and suffers a 50% miss chance.
In order to do this, I often see people use this procedure:
1) Make the attack roll.
2) Do all the math to determine the attack value.
3) Roll percentile dice to see if it was a miss.
This is slow and cumbersome. So at my table, I encourage to people to do this instead:
1) Roll your d20.
2) If it's an odd number, you miss.
3) If it's an even number, then you add up your attack bonus.
I find this much faster. It only requires one die roll per attack, not two, and you know immediately whether or not you've passed your miss chance. Knowing that prevents you from wasting time on math that isn't necessary. And it integrates seamlessly with the standard rules for automatic miss (natural 1, odd) and automatic hit (natural 20, even).
Just thought I'd put that out there. I hope someone finds it useful.
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Worst-case example of how it alters probabilities: you have an attack roll of +10. They have an AC of 28 and are invisible. Under the normal rules, you have a 15% chance hitting (18, 19 or 20), followed by a 50% miss chance, for an ultimate hit chance of 7.5%.
Under these rules, an 18 or a 20 hits, which works out at 10%.
Another possible method:
Roll a d20 and a d6 at the same time. If the d6 is 1-3, you miss. Otherwise, calculate your attack roll as normal.
|ryric RPG Superstar 2011 Top 32|
Your way also means that a miss chance will never negate a crit, which is a symptom of your system being a bit more swingy. Players will be happy when their PCs' crits aren't negated, but unhappy when their major cloak of displacement has no chance to save them from a nat 20.
It also doesn't really work with 20% miss chances.
Yeah, I've always rolled miss chance first or rolled them together.
There no reason to use d% for 50% miss chance. Just use a d6 with 1-3 being miss and 4-6 being hit. You could also use just a d10. Is needlessly complicated unless you really have so many possible outcomes they can't fit on any smaller die.
My approach is: Declare the attack. Roll a percentile. If it is under 50% don't bother rolling an attack. You missed.
You can do the even / odd die roll if you want. Or even toss a coin. But who doesn't like rolling 10 siders. They are fun and pointy!
(move step 3 to step 1... reduces rolls needed 50% of the time)