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<blockquote data-quote="Gerion of Mercadia" data-source="post: 3438708" data-attributes="member: 50527">The problem here is that miss chances are not directly correlatable to AC.Well, it is statistical probabilities.&nbsp; Concealment reduces the chance of being struck by anywhere from 10% to 50%.&nbsp; Furthermore, it can negate the dreaded &quot;natural 20&quot;.For a character who is hit on a d20 roll of 2 (95% probability) 50% concealment cuts this probability in half to 47.5%.&nbsp; In this situation, this is equivalent to an AC bonus of at least +10.&nbsp; If the character has a low enough AC such that he would mathematically be hit on a roll of 1, it is actually worth even more of an AC bonus.At the other end of the spectrum, if a character can only be hit on a 20, (5% probability)50% concealment means the character is only hit 2.5% of the time.&nbsp; With RAW, regardless of how high an AC bonus you get, you can't reduce your probability of getting hit any lower than 5% by mere AC bonuses alone.At any point between these &quot;extremes&quot; Concealment could be treated as an &quot;AC bonus&quot; - with regards to the probability of being hit with only a little &quot;probability rounding error&quot;.However, one of the added benefits of having concealment is that it can also negate certain special attacks - particularly Sneak attack and/or abilities such as the Assassin's &quot;Death attack&quot;.&nbsp; If you treat concealment as a simple dodge bonus to AC, this added defence goes away.To get concealment to &quot;translate&quot; into a direct AC bonus is highly situational, and an extreme headache.&nbsp; On top of that, it weakens the concealment ability.IMHO, simply rolling the percentile dice along with the d20 to hit greatly speeds up the process for calculating &quot;to hit&quot; when concealment is involved.&nbsp; As a &quot;dice rolling&quot; convention IMC, if concealment applies, I have my players roll percentile for concealment along with the d20 to hit.&nbsp; Doesn't slow the calculation much, but it does slow the &quot;roll&quot; time by simply combining them.</blockquote>

[QUOTE="Gerion of Mercadia, post: 3438708, member: 50527"] The problem here is that miss chances are not directly correlatable to AC. Well, it is statistical probabilities. Concealment reduces the chance of being struck by anywhere from 10% to 50%. Furthermore, it can negate the dreaded "natural 20". For a character who is hit on a d20 roll of 2 (95% probability) 50% concealment cuts this probability in half to 47.5%. In this situation, this is equivalent to an AC bonus of at least +10. If the character has a low enough AC such that he would mathematically be hit on a roll of 1, it is actually worth even more of an AC bonus. At the other end of the spectrum, if a character can only be hit on a 20, (5% probability)50% concealment means the character is only hit 2.5% of the time. With RAW, regardless of how high an AC bonus you get, you can't reduce your probability of getting hit any lower than 5% by mere AC bonuses alone. At any point between these "extremes" Concealment could be treated as an "AC bonus" - with regards to the probability of being hit with only a little "probability rounding error". However, one of the added benefits of having concealment is that it can also negate certain special attacks - particularly Sneak attack and/or abilities such as the Assassin's "Death attack". If you treat concealment as a simple dodge bonus to AC, this added defence goes away. To get concealment to "translate" into a direct AC bonus is highly situational, and an extreme headache. On top of that, it weakens the concealment ability. IMHO, simply rolling the percentile dice along with the d20 to hit greatly speeds up the process for calculating "to hit" when concealment is involved. As a "dice rolling" convention IMC, if concealment applies, I have my players roll percentile for concealment along with the d20 to hit. Doesn't slow the calculation much, but it does slow the "roll" time by simply combining them. [/QUOTE]

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