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<blockquote data-quote="TheLe" data-source="post: 220790" data-attributes="member: 3981">1/400 (ie .25%).That's not quite correct; in the DM guide, you need to roll 3 times.&nbsp; According to the DMG, you actually need to roll 2 natural 20's for an instant kill THREAT (1/400), then succeed on an additional &quot;to hit&quot; roll for an instant kill.1) Roll to hit.&nbsp; If hit, then you do normal damage.&nbsp; If it is a Critical THREAT (based on weapon), then roll again.2) Roll to hit.&nbsp; If it is a hit, then it is a Critical hit, and you do the Weapon Default Critical Damage.3) If rolls (1) and (2) were both Natural 20's, it is a Instant Kill THREAT. Roll Again to hit.&nbsp; (If it succeeds, it is an instant kill.&nbsp; If it fails, it is just a critical hit).Assuming a player needs to roll a natural '16' to-hit, the probability of rolling '20', '20', and '16' is:1/20 x 1/20 x 5/20 = 5/8000 (.0625%)In my chart, the chances are actually better than that, but not by very much.&nbsp; Let's assume the player needs to roll a 20 for a critical, 16 to hit, then 19 or 20 (on the Alpha20 chart) for an instant kill.&nbsp; Here is the probability:1/20 x 5/20 x 2/20 = 10/8,000 (.125%)Still pretty low.&nbsp; AND&nbsp; it allows a Fortitude Save. That's assuming the Alpha20 chart is used.&nbsp; Using the Alpha100 chart has far far far lower probability, even though you can get an instant kill on a 97-100.&nbsp; Let's assume the player needs to roll a 20 for a critical, 16 to hit, then 97-100 on the chart for an instant kill. 1/20 x 5/20 x 4/100 = 20/40,000 (.05%)That's lower than the DMG suggested method, and you will usually get some kind of fortitude save.The chance of a NO-SAVE instant kill on the Alpha100 chart is even lower!&nbsp; 1/20 x 5/20 x 1/20 = 5/40,000 or .0125%.And this is all assuming the player/monster needs to roll a natural '16' to hit.&nbsp; So a low-level NPC should have a much harder time to kill one of your higher level PCs.I really thought out these whole instant-kill rolls.&nbsp; But real world testing is what really counts.&nbsp; I appreciate every bit of constructive criticism.&nbsp; I wanted a chart that was intuitive, easy to use, balanced, and most of all:&nbsp; FUN.Thanks!Lord_AO, I hope you do get a chance to test out my table(s) when you come back from vacation.&nbsp; I am anxious to see what your results are.~Le</blockquote>

[QUOTE="TheLe, post: 220790, member: 3981"] 1/400 (ie .25%). That's not quite correct; in the DM guide, you need to roll 3 times. According to the DMG, you actually need to roll 2 natural 20's for an instant kill THREAT (1/400), then succeed on an additional "to hit" roll for an instant kill. 1) Roll to hit. If hit, then you do normal damage. If it is a Critical THREAT (based on weapon), then roll again. 2) Roll to hit. If it is a hit, then it is a Critical hit, and you do the Weapon Default Critical Damage. 3) If rolls (1) and (2) were both Natural 20's, it is a Instant Kill THREAT. Roll Again to hit. (If it succeeds, it is an instant kill. If it fails, it is just a critical hit). Assuming a player needs to roll a natural '16' to-hit, the probability of rolling '20', '20', and '16' is: 1/20 x 1/20 x 5/20 = 5/8000 (.0625%) In my chart, the chances are actually better than that, but not by very much. Let's assume the player needs to roll a 20 for a critical, 16 to hit, then 19 or 20 (on the Alpha20 chart) for an instant kill. Here is the probability: 1/20 x 5/20 x 2/20 = 10/8,000 (.125%) Still pretty low. [I]AND[/I] it allows a Fortitude Save. That's assuming the Alpha20 chart is used. Using the Alpha100 chart has far far far lower probability, even though you can get an instant kill on a 97-100. Let's assume the player needs to roll a 20 for a critical, 16 to hit, then 97-100 on the chart for an instant kill. 1/20 x 5/20 x 4/100 = 20/40,000 (.05%) That's lower than the DMG suggested method, and you will usually get some kind of fortitude save. The chance of a NO-SAVE instant kill on the Alpha100 chart is even lower! 1/20 x 5/20 x 1/20 = 5/40,000 or .0125%. And this is all assuming the player/monster needs to roll a natural '16' to hit. So a low-level NPC should have a much harder time to kill one of your higher level PCs. I really thought out these whole instant-kill rolls. But real world testing is what really counts. I appreciate every bit of constructive criticism. I wanted a chart that was intuitive, easy to use, balanced, and most of all: FUN. Thanks! Lord_AO, I hope you do get a chance to test out my table(s) when you come back from vacation. I am anxious to see what your results are. ~Le [/QUOTE]

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