Poison Damage

Diablo II Notation Basic Class Skill Item Ally Quest Area Monster Tale Attribute Unit Animation Attack Damage Death Crushing Blow Enhanced Minimum Maximum Adds Damage Damage + % Damage to Demons to Undead Deadly Strike Magic Fire Lightning Cold Poison Skill Damage ATD/ATLD DR/MDR Resistance Maximum Enemy Resist Immune Absorb Sunder Poison damage overlay Poison Damage normally causes a target to turn green when poisoned, a state which stops damage regeneration and can apply poison damage over the state's length. However, if cold length or Holy Freeze are also applied then the target remains or turns blue. Damage of multiple types can be applied by the same attack, but only one damage overlay is displayed at a time: this means that poison damage can still be applied even if the only overlay displayed is for fire, lightning or cold damage. It is not added to Smite or Lightning Bolt. While damage is displayed in points and length in seconds, both are calculated and applied using more precise units of measurement: each point is divided into 1/256ths, while each second is divided into 25 frames. [1] Targets are poisoned if as little as 1/256 poison damage is applied per frame. Poison damage is displayed as the total damage applied over its length, but it's calculated by applying its 1/256 damage rate for a specified number of frames: a Toxic Small Charm applies poison damage at a rate of 205/256 for 125 frames, which is displayed as 100 Poison Damage Over 5 Seconds (125 * 205/256 over 125/25). Poison damage from multiple attacks doesn't sum: if a target is already poisoned, then the rate and length of that poison will be overwritten by that of any subsequent attack which has an equal or greater rate. Rates are compared after all modifiers have been applied. [2] When player, mercenary or pet applies poison to a poisoned monster, their poison is applied for one frame instead of the current poison: if their poison has an equal or greater rate, it then overwrites the current poison and it gets applied for its length; if their poison has a lower rate, the current poison then continues for its remaining length. Rates are compared after all modifiers have been applied. More generally, poison damage does not get applied in frames in which any damage from other sources is applied (although poison and Open Wounds both apply simultaneously). [3] [4] In online modes (LoD and D2R, Expansion and Classic, LD and NLD) any damage from other source stops poison damage for additional 7 frames after taking damage. Builds relying on poison damage should refrain from utilizing other damage sources, such as Raise Skeleton. This mechanic is also applied to damage regeneration.[5] When using Whirlwind while equipping two weapons with the same attack rate against a single target (which can result in poison damage being applied by both attacks in the same frame), each attack applies one frame of its poison damage, then the highest rate is applied for its remaining length. When equal rates are applied, the length of the last is applied (whichever is the secondary weapon for that attack check). [6] When monsters apply poison to a player, mercenary or pet, their poison is applied for one frame as well as the current poison: if their poison has an equal or greater rate, it then overwrites the current poison and it gets applied for its length; if their poison has a lower rate, the current poison then continues for its remaining length. Rabies and Poison Creeper can also apply additional frames of poison damage when applied to more than one monster. Poison damage can kill monsters, mercenaries and pets but will only reduce players to 1 life (although poison damage from a subsequent attack would kill them if they remained on 1 life). [7] Item If a single item has both a prefix and a suffix applying poison damage, then the rates and lengths of both are simply added. [8] Source Poison Damage Frame Rate (1/256) Frames Min Max Seconds Min Max Toxic Small Charm 100 100 5 205 205 125 Small Charm of Anthrax 50 50 6 86 86 150 Toxic Small Charm of Anthrax 313 313 11 291 291 275 Displayed damage is rounded to the nearest point, although it should always be rounded down. When multiple items applying poison damage are equipped, then the rates are added and the lengths are averaged. [9] Source Poison Damage Frame Rate (1/256) Frames Min Max Seconds Min Max Toxic Small Charm of Anthrax 313 313 11 291 291 275 Blackbog's Sharp Cinquedeas 488 488 10 500 500 250 Perfect Emerald 100 100 7.16 143 143 179 Total 934 934 704 853 188/256 (234 * 934/256) poison damage over 9.36 ( [704/3] /25) seconds is applied (values are rounded down to the nearest 1/256 and frame). Gems, jewels and runes all count as separate items, even if they're socketed in a single item. [10] Length is calculated differently when multiple items applying poison damage are used with skills that apply less than 100% weapon damage. Poison length = [sum of lengths / (sources - 1) ] Multiple Shot Strafe Blade Sentinel using one-handed weapon Blade Fury using one-handed weapon Poison length = sum of lengths Blade Sentinel using two-handed weapon Blade Fury using two-handed weapon [11] [12] [13] Charm Small Charm Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max 15 15 3 52 52 75 Septic Small Charm 13 18 50 50 4 128 128 100 Foul Small Charm 31 39 100 100 5 205 205 125 Toxic Small Charm 55 63 175 175 6 299 299 150 Pestilent Small Charm 80 88 6 6 3 21 21 75 Small Charm of Blight 6 9 15 15 4 39 39 100 Small Charm of Venom 15 20 25 25 5 52 52 125 Small Charm of Pestilence 24 32 50 50 6 86 86 150 Small Charm of Anthrax 36 44 Large Charm Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max 10 10 3 35 35 75 Septic Large Charm 6 9 30 30 4 77 77 100 Foul Large Charm 19 26 90 90 5 185 185 125 Toxic Large Charm 38 46 175 175 6 299 299 150 Pestilent Large Charm 58 66 6 6 3 21 21 75 Large Charm of Blight 3 5 15 15 4 39 39 100 Large Charm of Venom 9 13 25 25 5 52 52 125 Large Charm of Pestilence 17 23 50 50 6 86 86 150 Large Charm of Anthrax 25 33 Grand Charm Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max 5 5 3 18 18 75 Septic Grand Charm 1 1 15 15 4 39 39 100 Foul Grand Charm 9 12 50 50 5 103 103 125 Toxic Grand Charm 20 27 100 100 6 171 171 150 Pestilent Grand Charm 34 42 6 6 3 21 21 75 Grand Charm of Blight 1 1 15 15 4 39 39 100 Grand Charm of Venom 4 6 25 25 5 52 52 125 Grand Charm of Pestilence 10 14 50 50 6 86 86 150 Grand Charm of Anthrax 15 21 Any socket Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max 20 20 2 103 103 50 Jewel of Envy 1 1 Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 37 37 2 187 187 50 Rainbow Facet Jewel 49 No Helm Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 80 80 8 102 102 200 Wormskull Bone Helm 21 No Circlet Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max 6 6 2 31 31 50 Septic Circlet 1 1 7 7 3 24 24 75 Circlet of Blight 3 5 21 21 4 54 54 100 Circlet of Venom 11 15 50 50 5 103 103 125 Circlet of Pestilence 18 25 Amulet Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max 50 50 3 171 171 75 Amulet of Blight 33 45 Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 40 40 4 102 102 100 Atma's Scarab Amulet 60 No Body armor Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 24 34 2 125 175 50 Dark Adherent Dusk Shroud 49 No Weapon Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 10 10 3 34 34 75 Chipped Emerald in socket 1 No 20 20 4 51 51 100 Flawed Emerald in socket 5 No 40 40 5 82 82 125 Emerald in socket 12 No 60 60 6.08 101 101 152 Flawless Emerald in socket 15 No 100 100 7.16 143 143 179 Perfect Emerald in socket 18 No 75 75 5 154 154 125 Tal Rune in socket 17 No 273 273 6 466 466 150 Venom weapon 49 No Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max 6 6 2 31 31 50 Septic Weapon 1 1 12 12 3 41 41 75 Foul Weapon 7 10 80 80 4 205 205 100 Corrosive Weapon 15 20 150 150 5 308 308 125 Toxic Weapon 26 35 275 275 6 470 470 150 Pestilent Weapon 37 50 2 2 2 8 8 50 Weapon of Blight 1 1 1-4 7 7 3 24 24 75 Weapon of Blight 2 3 5 21 21 4 54 54 100 Weapon of Venom 2 11 15 50 50 5 103 103 125 Weapon of Pestilence 2 18 25 100 100 6 171 171 150 Weapon of Anthrax 2 25 33 1 Excluding scepters, staves and orbs 2 Excluding rods (scepters, staves and wands) and orbs Missile weapon Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 75 75 5 154 154 125 Edge missile weapon 25 Yes (LoD only) 75 75 5 154 154 125 Insight missile weapon (D2R only) 27 No (D2R only) Crossbow Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 30 30 3 102 102 75 Ichorsting Crossbow 18 No 150 150 8 192 192 200 Pus Spitter Siege Crossbow 36 No Axe Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 38 38 3 128 128 75 Rakescar War Axe 27 No 250 250 10 256 256 250 Guardian Naga Naga 48 No Claw Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 75 75 5 154 154 125 Pattern claw 23 No (D2R only) Dagger Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 180 180 4 460 460 100 The Jade Tan Do Kris 19 No 488 488 10 500 500 250 Blackbog's Sharp Cinquedeas 38 No Hammer Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 204 204 6 349 349 150 Immortal King's Stone Crusher Ogre Maul (5 items) 76 No Javelin Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 293 293 10 300 300 250 Gargoyle's Bite Winged Harpoon 70 No Polearm Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 75 75 5 154 154 125 Insight polearm 27 Yes (LoD only) Scepter Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 75 75 5 154 154 125 Holy Thunder scepter 21 No 160 160 4 409 409 100 The Fetid Sprinkler Holy Water Sprinkler 38 No Spear Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 325 325 10 333 333 250 Viperfork Mancatcher 71 No 394 394 10 403 403 250 Arioc's Needle Hyperion Spear 81 No Staff Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 12 12 3 40 40 75 Serpent Lord Long Staff 9 No 75 75 5 154 154 125 Insight staff 27 Yes (LoD only) Sword Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 28 56 6 48 96 150 Hellplague Long Sword 22 No 75 75 5 154 154 125 Spirit sword 25 Yes (LoD only) 113 113 6 192 192 150 Blacktongue Bastard Sword 26 No 50 50 2 255 255 50 Bul-Kathos' Tribal Guardian Mythical Sword 66 No 300 300 8 384 384 200 Plague Bearer Rune Sword 41 No 250 250 6 426 426 150 The Vile Husk Tusk Sword 44 No Shield Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 80 80 4 204 204 100 Radament's Sphere Ancient Shield 50 No Shrunken head Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max 2 7 3 8 24 75 Shrunken head - 1 5 14 3 16 48 75 Shrunken head - 15 13 28 4 32 72 100 Shrunken head - 25 25 50 4 64 128 100 Shrunken head - 33 One of the above always spawns on any shrunken head which isn't Unique or Set quality. Required Level (Rlvl) only applies when a shrunken head is magic or rare quality. Ring Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max 50 50 3 171 171 75 Ring of Blight 33 45 Belt Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 12 12 3 40 40 75 Snakecord Light Belt 12 No Gloves Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 9 11 3 30 36 75 Sander's Taboo Heavy Gloves 28 No 60 60 4 153 153 100 Venom Grip Demonhide Gloves 29 No Set bonus Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max 5 9 3 16 32 75 Berserker's Arsenal (Full) 3 No 8 8 3 25 25 80 Infernal Tools (2 items) 5 No 22 22 3 75 75 75 The Disciple (3 items) 49 No Skill Skill level is set when the player uses the skill: adding or removing skill bonuses won't have any effect on rate or length if there's a delay between using the skill and applying poison damage. While skills are normally treated as separate sources of poison damage whose rates (and accompanying lengths) compete with those of other skills and items, Poison Dagger and the javelins (but not the clouds) of Poison Javelin and Plague Javelin combine skill damage rate with any item rates added to attack damage; the length for which this combined rate is applied is calculated by summing skill and item lengths, and dividing by the number of items. [14] Source Poison Damage Frame Rate (1/256) Frames Min Max Seconds Min Max Toxic Small Charm of Anthrax 313 313 11 291 291 275 Blackbog's Sharp Cinquedeas 488 488 10 500 500 250 Perfect Emerald 100 100 7.16 143 143 179 Level 30 Poison Dagger 12,383 12,909 13.6 9324 9720 340 Total 10258 10654 1044 Min poison0 = 348 * 10258/256 = 13,944 Max poison0 = 348 * 10654/256 = 14,482 Seconds0 = [1,044/3] /25 = 13.92 If the only item used were Blackbog's Sharp Cinquedeas, 9824-10220 rate for 590 ((250+340)/1) frames would apply 22,641-23,553 poison damage over 23.6 (590/25) seconds. Although the rate is lower with only one item, the length can be significantly longer and results in far more damage from a single stab. Character screen does not display total poison damage correctly when skill and item rates combine: it simply adds total poison damage from items to skill damage. [15] Amazon Skill Skill level Min Rlvl 1-8 9-16 17-22 23-28 > 28 Poison Javelin 1 2 Min 16*slvl + 16 32*slvl - 112 48*slvl - 368 64*slvl - 720 96*slvl - 1616 6 Max 16*slvl + 32 36*slvl - 128 52*slvl - 384 68*slvl - 736 84*slvl - 1184 +% 12*Plague Javelin.blvl Sec (50*slvl + 150) /25 Plague Javelin 2 Min 48*slvl + 32 96*slvl - 352 160*slvl - 1376 320*slvl - 4896 480*slvl - 9376 18 Max 48*slvl + 80 96*slvl - 304 160*slvl - 1328 320*slvl - 4848 480*slvl - 9328 +% 10*Poison Javelin.blvl Sec (10*slvl + 65) /25 1 Level > 36 Poison Javelin displays higher minimum than maximum damage because the minimum rate added per level for level > 28 is higher than the maximum rate added. When this occurs, the minimum damage effectively becomes the maximum and the maximum damage becomes the minimum. [16] 2 Javelins apply combined rates of skill and attack poison damage from items and Venom, over their combined lengths divided by the number of items (combined skill length only when Venom is cast). Character screen simply adds total attack poison damage to skill damage. [17] Assassin Skill Skill level Min Rlvl 1-8 9-16 17-22 23-28 > 28 Venom Min 384*slvl + 1152 512*slvl + 128 640*slvl - 1920 768*slvl - 4736 896*slvl - 8320 30 Max 384*slvl + 1664 512*slvl + 640 640*slvl - 1408 768*slvl - 4224 896*slvl - 7808 Sec 0.4 (10/25) Venom's damage rate is added to those from items added to attacks for its 4*slvl + 116 second duration. However, its 10 frame length overrides those of any items. Source Poison Damage Frame Rate (1/256) Frames Min Max Seconds Min Max Toxic Small Charm of Anthrax 313 313 11 291 291 275 Blackbog's Sharp Cinquedeas 488 488 10 500 500 250 Perfect Emerald 100 100 7.16 143 143 179 Level 15 Venom 305 325 0.4 7808 8320 10 Total 8742 9254 10 Min poison0 = 10 * 8742/256 = 341 Max poison0 = 10 * 9254/256 = 361 Seconds0 = 10/25 = 0.4 Venom's length does not override those of the skills Poison Dagger, Poison Javelin and Plague Javelin. Casting Venom can thus significantly increase the rate applied by these skills while not reducing length. Since Venom effectively creates a single source which sums the rates of Venom and items but which only applies for Venom's length, the length is the sum of the skill length and that of Venom. [18] Source Poison Damage Frame Rate (1/256) Frames Min Max Seconds Min Max Toxic Small Charm of Anthrax 313 313 11 291 291 275 Blackbog's Sharp Cinquedeas 488 488 10 500 500 250 Perfect Emerald 100 100 7.16 143 143 179 Level 30 Poison Dagger 12,383 12,909 13.6 9324 9720 340 Level 15 Venom 305 325 0.4 7808 8320 10 Total 18066 18974 350 Min poison0 = 350 * 18066/256 = 24,699 Max poison0 = 350 * 18974/256 = 25,941 Seconds = 350/25 = 14 Character screen does not display total poison damage correctly when skill, item and Venom rates combine: it correctly calculates total poison damage from items and Venom, but then simply adds this to skill damage. [19] Druid Skill Skill level Min Rlvl 1-8 9-16 17-22 23-28 > 28 Rabies Min 32*slvl + 16 40*slvl - 48 56*slvl - 304 88*slvl - 1008 128*slvl - 2128 18 Max 32*slvl + 80 40*slvl + 16 56*slvl - 240 88*slvl - 944 128*slvl - 2064 +% 18*Poison Creeper.blvl Sec (10*slvl + 90) /25 Necromancer Skill Skill level Min Rlvl 1-8 9-16 17-22 23-28 > 28 Poison Dagger 1 Min 20*slvl + 16 30*slvl - 64 40*slvl - 224 46*slvl - 356 52*slvl - 524 6 Max 20*slvl + 60 30*slvl - 20 40*slvl - 180 46*slvl - 312 52*slvl - 480 +% 20 * Poison Explosion.blvl+Poison Nova.blvl Sec (10*slvl + 40) /25 Poison Explosion Min 32*slvl + 96 64*slvl - 160 96*slvl - 672 128*slvl - 1376 160*slvl - 2272 18 Max 32*slvl + 352 64*slvl + 96 96*slvl - 416 128*slvl - 1120 160*slvl - 2016 +% 15 * Poison Dagger.blvl+Poison Nova.blvl Sec (10*slvl + 40) /25 Poison Nova Min 64*slvl + 192 96*slvl - 64 144*slvl - 832 224*slvl - 2592 256*slvl - 3488 30 Max 64*slvl + 400 96*slvl + 144 144*slvl - 624 224*slvl - 2384 256*slvl - 3280 +% 10 * Poison Dagger.blvl+Poison Explosion.blvl Sec 2 (50/25) 1 Poison Dagger applies combined rates of skill and attack poison damage from items and Venom, over their combined lengths divided by the number of items (combined skill length only when Venom is cast). Character screen simply adds total attack poison damage to skill damage. [20] Pet Druid Pet Skill level Min Rlvl 1-8 9-16 17-22 23-28 > 28 Poison Creeper Min 7*slvl + 5 12*slvl - 35 15*slvl - 83 17*slvl - 127 19*slvl - 183 1 Max 7*slvl + 9 12*slvl - 31 15*slvl - 79 17*slvl - 123 19*slvl - 179 Sec 4 (100/25) Necromancer Pet Missile level Min Rlvl 1-8 9-16 17-22 23-28 > 28 Necromage Min lvl+5 2*lvl - 3 4*lvl - 35 6*lvl - 79 8*lvl - 135 12 Max lvl+5 2*lvl - 3 4*lvl - 35 6*lvl - 79 8*lvl - 135 Sec (250*lvl + 250) /25 Lvl if(slvl < 4 , 0 , [slvl-2 /2] ) + Skeleton Mastery.slvl Monster Monster Normal Nightmare Hell Poison Enchanted monster Min [MonLvl*0.66] * (mlvl*10 + 300) /256 [MonLvl*0.66] * (mlvl*10 + 300) /256 [MonLvl*0.66] * (mlvl*10 + 300) /256 Max MonLvl * (mlvl*10 + 300) /256 MonLvl * (mlvl*10 + 300) /256 MonLvl * (mlvl*10 + 300) /256 Sec (mlvl*0.4 + 12) /25 (mlvl*0.4 + 12) /25 (mlvl*0.4 + 12) /25 Poison Enchanted minion Min [MonLvl*0.33] * (mlvl*10 + 300) /256 [MonLvl*0.33] * (mlvl*10 + 300) /256 Max [MonLvl*0.66] * (mlvl*10 + 300) /256 [MonLvl*0.66] * (mlvl*10 + 300) /256 Sec (mlvl*0.4 + 12) /25 (mlvl*0.4 + 12) /25 Spectral Hit Unique Min [MonLvl*0.66] * 40/256 [MonLvl*0.66] * 40/256 [MonLvl*0.66] * 40/256 Max MonLvl * 40/256 MonLvl * 40/256 MonLvl * 40/256 Sec 1.6 (40/25) 1.6 (40/25) 1.6 (40/25) [21] Poison Enchanted monster can also fire invisible missiles: Stat Value Minimum Poison Damage 6*mlvl * 800/256 Maximum Poison Damage (6*mlvl + 10) * 800/256 Length (Seconds) 32 (800/25) [22] Poison damage and length is added to attack damage of some monsters, while others can fire missiles or use skills applying it. Monster poison attack damage and length is calculated as follows: Stat Value Frame Rate (1/256) [ [MonLvl * ElD/100] * (15 + # players) /16] * 10 Frames [ElDur * (15 + # players) /16] * 2 ElD and ElDur are the entries in the relevant ElMin/MaxD and ElDur columns of MonStats.txt respectively. [23] Calculation Download Poison damage calculator.xls (onderduiker) Updated 24 November 2012 Online PlanetDiablo.eu Diablo 2 Skill-Calculator (PlanetDiablo.eu) Skills only Gift Kalkulator (D2Chars.de) Poison Dagger, Poison Explosion and Poison Nova with items, +% PSD, LR, -% EPR and PR % Skill Calculator (Dieter Gottwald) Poison Dagger, Poison Explosion and Poison Nova with +% PSD and PR % Kalkulatoren: Gift-Schaden (D2Wissen.de) Items with Venom, Poison Dagger, Poison Javelin or Plague Javelin and +% PSD Below is a summary of all the steps in the calculation of poison damage. To express total damage in points applied over a length in seconds: Points = [ Rate * Frames /256 ] Seconds = Frames /25 0 Rate = [ ( [ [B * S] * M] + [ (I + [V * M] ) * M] ) * R] Frames = [F * R] 0 [ ] Round down B Skill rate I Item rates V Venom rate M +X% Poison Skill Damage M = (100+X) /100 S +X% poison damage synergy S = (100+X) /100 R Resist R = (100-X) /100 If P >= 100 and P - [L/5] < 100 then X = P - [L/5] else R = 0 If P < 100 then X = max(P - (L+E) , -100) P Poison Resist X% P = X L Lower Resist (PR -X%) L = X E -X% EPR E = X F Items = item lengths / items Items + Skill = (skill + item lengths) / items Items + Venom = Venom length Skill + Venom = skill + Venom lengths R Resist R = (100-X) /100 If P < 100 then X = max(P-E , -100) else F = 1 P Poison Length Reduced by X% P = X E -X% Enemy Poison Resistance E = X Ideally damage is calculated measuring rate in 1/256ths and length in frames. It's also possible to calculate damage measuring rate in poison damage/second and length in seconds. However, the result will only be an approximation and rounding down should only be done at the end of the calculation for maximum accuracy. If a single item has both a prefix and a suffix applying poison damage, then the rates and lengths of both are simply added. Gems, jewels and runes all count as separate items, even if they're socketed in a single item. Item and Venom rate are only added to the skill rates of Poison Dagger and the javelins (but not the clouds) of Poison Javelin and Plague Javelin. Character screen does not display total poison damage correctly when skill, item and Venom rates combine: it correctly calculates total poison damage from items and Venom, but then simply adds this to skill damage. +% PSD isn't applied to item and Venom rate when applied by ranged attacks. Length is calculated differently when multiple items applying poison damage are used with skills that apply less than 100% weapon damage. Poison length = [sum of lengths / (sources - 1) ] Multiple Shot Strafe Blade Sentinel using one-handed weapon Blade Fury using one-handed weapon Poison length = sum of lengths Blade Sentinel using two-handed weapon Blade Fury using two-handed weapon Reference KKKKAAAAOOOOZZZZ (D2 Assassin) Open Wounds (D2 Technical) Poison Dagger and the character screen (D2 Necromancer) Schadensunterbrechung: Giftnova und anderer Schaden (PlanetDiablo.eu) Diablo II Basin Wiki (D2 Technical) Bkelly, The Tao of Poison (Internet Archive) LastCorpse, Giftdauer bei SrcDam <128 Missiles (PlanetDiablo.eu) Librarian, poison damage (FAQtoids) Meej, Clarifications on 1.10 Poison needed (D2 Technical) Onderduiker, ANY damage stops unit damage regeneration (D2 Technical) Onderduiker, Monster Bonuses, Death Damage and Corpse Explosion (D2 Technical) Onderduiker, Monster Resistances and Immunities Guide (D2 Technical) Onderduiker, Poison and Plague Javelins (D2 Javazon) Onderduiker, Poison Damage (D2 Technical) Othin, Poison Basics (D2library)