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Trading AC for DR in 5e
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<blockquote data-quote="MechaPilot" data-source="post: 6588756" data-attributes="member: 82779"><p>I'm not sure on the exact numbers, but let's give this a shot.</p><p></p><p>Probably the easiest first step is to make a series of assumptions to start from:</p><p>#1) Let's say that combats last three rounds.</p><p>#2) Let's say that characters face three combats a day.</p><p>#3) Let's say the average attack does 1d8 damage, for an average of 4.5 damage per attack.</p><p>#4) Attackers have from one to four possible attacks per attack action, so let's say three attacks per attack action.</p><p></p><p>Assumption three gives us an average of 4.5 damage per attack.</p><p>Assumption four multiplies that 4.5 by the three possible attacks per round for an average of 13.5 damage per attack action.</p><p>Assumptions one and two result in an assumed total of facing 9 attack actions per day. Multiplying that by 13.5 damage per attack action gives 121 hit points. </p><p></p><p>Do not worry, this is NOT your bonus HPs! The 121 HPs assumes the character gets hit with every attack and takes average damage. These 121 HPs are multiplied by a fraction determined as follows:</p><p></p><p>The numerator is the portion of the static AC granted by the armor that exceeds 10. Studded leather would have a numerator of 2. The denominator is 20, the highest possible result on the d20 rolled to attack.</p><p></p><p>To complete the example, Studded leather would grant 121*2/20 bonus HPs, which works out to 12 bonus HPs per day as compensation for the 2 points of AC given up.</p><p></p><p></p><p>By comparison, here's plate armor and a shield.</p><p>121 HPs * (20-10) /20 = 60 bonus HPs per day.</p><p></p><p></p><p>If you opt to use this method, one damage alternative would be to allow critical hits to bypass the armor's bonus HPs (applying it directly to the character's HPs) instead of dealing extra damage to the pool of bonus HPs.</p><p></p><p>Edit: I just realized from my two examples that this appears to work out to 6 HPs per point of static AC above 10.</p></blockquote><p></p>
[QUOTE="MechaPilot, post: 6588756, member: 82779"] I'm not sure on the exact numbers, but let's give this a shot. Probably the easiest first step is to make a series of assumptions to start from: #1) Let's say that combats last three rounds. #2) Let's say that characters face three combats a day. #3) Let's say the average attack does 1d8 damage, for an average of 4.5 damage per attack. #4) Attackers have from one to four possible attacks per attack action, so let's say three attacks per attack action. Assumption three gives us an average of 4.5 damage per attack. Assumption four multiplies that 4.5 by the three possible attacks per round for an average of 13.5 damage per attack action. Assumptions one and two result in an assumed total of facing 9 attack actions per day. Multiplying that by 13.5 damage per attack action gives 121 hit points. Do not worry, this is NOT your bonus HPs! The 121 HPs assumes the character gets hit with every attack and takes average damage. These 121 HPs are multiplied by a fraction determined as follows: The numerator is the portion of the static AC granted by the armor that exceeds 10. Studded leather would have a numerator of 2. The denominator is 20, the highest possible result on the d20 rolled to attack. To complete the example, Studded leather would grant 121*2/20 bonus HPs, which works out to 12 bonus HPs per day as compensation for the 2 points of AC given up. By comparison, here's plate armor and a shield. 121 HPs * (20-10) /20 = 60 bonus HPs per day. If you opt to use this method, one damage alternative would be to allow critical hits to bypass the armor's bonus HPs (applying it directly to the character's HPs) instead of dealing extra damage to the pool of bonus HPs. Edit: I just realized from my two examples that this appears to work out to 6 HPs per point of static AC above 10. [/QUOTE]
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