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 Targets turn green when poisoned, a state which stops unit damage regeneration and can apply poison damage to the target every frame of the state's length. While damage is displayed in points and length in seconds, both are calculated and applied using more precise units of measurement: damage is calculated and applied in bits, and length in frames. [1] Damage Length Points Bits Seconds Frames 1 256 1 25 Targets are poisoned if as little as 1 bit poison damage is applied per frame. Poison damage is displayed as the total damage applied over its length, but it's calculated by applying a bit rate (bit damage per frame) for a specified number of frames: a Toxic Small Charm applies 205 bit rate for 125 frames, which is displayed as 100 Poison Damage Over 5 Seconds (205*125/256 over 125/25). Poison damage from multiple attacks doesn't stack: 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] 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 hit life). [5] 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. [6] Source Poison Damage Bit Rate 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 damage are equipped, then the rates are added and the lengths are averaged. [7] Source Poison Damage Bit Rate Frames Min Max Seconds Min Max Toxic Small Charm of Anthrax 313 313 11.00 291 291 275 Blackbog's Sharp Cinquedeas 488 488 10.00 500 500 250 Perfect Emerald 100 100 7.16 143 143 179 Total 934 934 704 853 (934*234/256) poison damage over 9.36 ([704/3]/25) seconds is applied. Bits and frames are the smallest units of measurement, so calculations are rounded down to the nearest bit and frame. Gems, jewels and runes all count as separate items, even if they're socketed in a single item. [8] Length is calculated differently when multiple items applying poison damage are used with skills that apply a fraction of weapon damage. This applies to the following following skills: Multiple Shot Strafe Blade Sentinel Blade Fury Blade Shield [9] Two items will apply poison damage over the sum of their lengths, while three or more items will just apply poison damage over the longest length of any of those items. [10] Charm Small Charm Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max Septic Small Charm 15 15 3 52 52 75 13 18 Foul Small Charm 50 50 4 128 128 100 31 39 Toxic Small Charm 100 100 5 205 205 125 55 63 Pestilent Small Charm 175 175 6 299 299 150 80 88 Small Charm of Blight 6 6 3 21 21 75 6 9 Small Charm of Venom 15 15 4 39 39 100 15 20 Small Charm of Pestilence 25 25 5 52 52 125 24 32 Small Charm of Anthrax 50 50 6 86 86 150 36 44 Large Charm Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max Septic Large Charm 10 10 3 35 35 75 6 9 Foul Large Charm 30 30 4 77 77 100 19 26 Toxic Large Charm 90 90 5 185 185 125 38 46 Pestilent Large Charm 175 175 6 299 299 150 58 66 Large Charm of Blight 6 6 3 21 21 75 3 5 Large Charm of Venom 15 15 4 39 39 100 9 13 Large Charm of Pestilence 25 25 5 52 52 125 17 23 Large Charm of Anthrax 50 50 6 86 86 150 25 33 Grand Charm Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max Septic Grand Charm 5 5 3 18 18 75 1 1 Foul Grand Charm 15 15 4 39 39 100 9 12 Toxic Grand Charm 50 50 5 103 103 125 20 27 Pestilent Grand Charm 100 100 6 171 171 150 34 42 Grand Charm of Blight 6 6 3 21 21 75 1 1 Grand Charm of Venom 15 15 4 39 39 100 4 6 Grand Charm of Pestilence 25 25 5 52 52 125 10 14 Grand Charm of Anthrax 50 50 6 86 86 150 15 21 Any socket Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max Jewel of Envy 20 20 2 103 103 50 1 1 Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Rainbow Facet Jewel 37 37 2 187 187 50 49 No Helm Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Wormskull Bone Helm 80 80 8 102 102 200 21 No Circlet Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max Septic Circlet 6 6 2 31 31 50 1 1 Circlet of Blight 7 7 3 24 24 75 3 5 Circlet of Venom 21 21 4 54 54 100 11 15 Circlet of Pestilence 50 50 5 103 103 125 18 25 Amulet Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max Amulet of Blight 50 50 3 171 171 75 33 45 Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Atma's Scarab Amulet 40 40 4 102 102 100 60 No Body armor Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Dark Adherent Dusk Shroud 24 34 2 125 175 50 49 No Weapon Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max Septic Weapon 6 6 2 31 31 50 1 1 Foul Weapon 12 12 3 41 41 75 7 10 Corrosive Weapon 80 80 4 205 205 100 15 20 Toxic Weapon 150 150 5 308 308 125 26 35 Pestilent Weapon 275 275 6 470 470 150 37 50 Weapon of Blight 1 2 2 2 8 8 50 1 1-4 Weapon of Blight 2 7 7 3 24 24 75 3 5 Weapon of Venom 2 21 21 4 54 54 100 11 15 Weapon of Pestilence 2 50 50 5 103 103 125 18 25 Weapon of Anthrax 2 100 100 6 171 171 150 25 33 1 Excluding scepters, staves and orbs 2 Excluding rods (scepters, staves and wands) and orbs Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Chipped Emerald in weapon socket 10 10 3.00 34 34 75 1 No Flawed Emerald in weapon socket 20 20 4.00 51 51 100 5 No Emerald in weapon socket 40 40 5.00 82 82 125 12 No Flawless Emerald in weapon socket 60 60 6.08 101 101 152 15 No Perfect Emerald in weapon socket 100 100 7.16 143 143 179 18 No Tal Rune in weapon socket 75 75 5.00 154 154 125 17 No Venom weapon 273 273 6.00 466 466 150 49 No Missile weapon Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Ichorsting Crossbow 30 30 3 102 102 75 18 No Edge missile weapon 75 75 5 154 154 125 25 Yes Pus Spitter Siege Crossbow 150 150 8 192 192 200 36 No Axe Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Rakescar War Axe 38 38 3 128 128 75 27 No Guardian Naga Naga 250 250 10 256 256 250 48 No Dagger Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max The Jade Tan Do Kris 180 180 4 460 460 100 19 No Blackbog's Sharp Cinquedeas 488 488 10 500 500 250 38 No Hammer Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Immortal King's Stone Crusher Ogre Maul 5 items 204 204 6 349 349 150 76 No Javelin Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Gargoyle's Bite Winged Harpoon 293 293 10 300 300 250 70 No Polearm Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Insight polearm 75 75 5 154 154 125 27 Yes Scepter Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Holy Thunder scepter 75 75 5 154 154 125 21 No The Fetid Sprinkler Holy Water Sprinkler 160 160 4 409 409 100 38 No Spear Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Viperfork Mancatcher 325 325 10 333 333 250 71 No Arioc's Needle Hyperion Spear 394 394 10 403 403 250 81 No Staff Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Serpent Lord Long Staff 12 12 3 40 40 75 9 No Insight staff 75 75 5 154 154 125 27 Yes Sword Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Hellplague Long Sword 28 56 6 48 96 150 22 No Spirit sword 75 75 5 154 154 125 25 Yes Blacktongue Bastard Sword 113 113 6 192 192 150 26 No Bul-Kathos' Tribal Guardian Mythical Sword 50 50 2 255 255 50 66 No Plague Bearer Rune Sword 300 300 8 384 384 200 41 No The Vile Husk Tusk Sword 250 250 6 426 426 150 44 No Shield Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Radament's Sphere Ancient Shield 80 80 4 204 204 100 50 No Shrunken head Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max Shrunken head 2 7 3 8 24 75 - 1 Shrunken head 5 14 3 16 48 75 - 15 Shrunken head 13 28 4 32 72 100 - 25 Shrunken head 25 50 4 64 128 100 - 33 One of the above always spawns on any shrunken head which isn't Unique or Set quality. Ring Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Min Alvl Min Max Seconds Min Max Ring of Blight 50 50 3 171 171 75 33 45 Belt Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Snakecord Light Belt 12 12 3 40 40 75 12 No Gloves Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Sander's Taboo Heavy Gloves 9 11 3 30 36 75 28 No Venom Grip Demonhide Gloves 60 60 4 153 153 100 29 No Set bonus Poison Damage Frame Rate (1/256) Frames Source Min Rlvl Ladder Min Max Seconds Min Max Berserker's Arsenal Full 5 9 3 16 32 75 3 No Infernal Tools 2 items 8 8 3 25 25 80 5 No The Disciple 3 items 22 22 3 75 75 75 49 No Missile Raise Skeletal Mage summons Necromages which fire missiles with lvl = if(slvl<4,0,[(slvl-2)/2])+Skeleton Mastery.lvl). Missile Bit Rate at Level Frames 1-8 9-16 17-22 23-28 >28 Necromage1 lvl+5 (2*lvl)-3 (4*lvl)-35 (6*lvl)-79 (8*lvl)-135 250+(250*lvl) 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 the poison. Skill Bit Rate at Level +% Poison Damage Frames 1-8 9-16 17-22 23-28 >28 Poison Javelin Min (16*slvl)+16 (32*slvl)-112 (48*slvl)-368 (64*slvl)-720 (96*slvl)-1616 12*Plague Javelin.blvl 150+(50*slvl) Max (16*slvl)+32 (36*slvl)-128 (52*slvl)-384 (68*slvl)-736 (84*slvl)-1184 Plague Javelin Min (48*slvl)+32 (96*slvl)-352 (160*slvl)-1376 (320*slvl)-4896 (480*slvl)-9376 10*Poison Javelin.blvl 65+(10*slvl) Max (48*slvl)+80 (96*slvl)-304 (160*slvl)-1328 (320*slvl)-4848 (480*slvl)-9328 Venom Min (384*slvl)+1152 (512*slvl)+128 (640*slvl)-1920 (768*slvl)-4736 (896*slvl)-8320 10 Max (384*slvl)+1664 (512*slvl)+640 (640*slvl)-1408 (768*slvl)-4224 (896*slvl)-7808 Poison Creeper Min (7*slvl)+5 (12*slvl)-35 (15*slvl)-83 (17*slvl)-127 (19*slvl)-183 100 Max (7*slvl)+9 (12*slvl)-31 (15*slvl)-79 (17*slvl)-123 (19*slvl)-179 Rabies Min (32*slvl)+16 (40*slvl)-48 (56*slvl)-304 (88*slvl)-1008 (128*slvl)-2128 18*Poison Creeper.blvl 90+(10*slvl) Max (32*slvl)+80 (40*slvl)+16 (56*slvl)-240 (88*slvl)-944 (128*slvl)-2064 Poison Dagger Min (20*slvl)+16 (30*slvl)-64 (40*slvl)-224 (46*slvl)-356 (52*slvl)-524 20*(PE.blvl+PN.blvl) 40+(10*slvl) Max (20*slvl)+60 (30*slvl)-20 (40*slvl)-180 (46*slvl)-312 (52*slvl)-480 Poison Explosion Min (32*slvl)+96 (64*slvl)-160 (96*slvl)-672 (128*slvl)-1376 (160*slvl)-2272 15*(PD.blvl+PN.blvl) 40+(10*slvl) Max (32*slvl)+352 (64*slvl)+96 (96*slvl)-416 (128*slvl)-1120 (160*slvl)-2016 Poison Nova Min (64*slvl)+192 (96*slvl)-64 (144*slvl)-832 (224*slvl)-2592 (256*slvl)-3488 10*(PD.blvl+PE.blvl) 50 Max (64*slvl)+400 (96*slvl)+144 (144*slvl)-624 (224*slvl)-2384 (256*slvl)-3280 Level >36 Poison Javelin displays higher minimum than maximum damage because the minimum bit rate added per level for level >28 is higher than the maximum bit rate added. When this occurs, the minimum damage becomes the maximum and the maximum damage becomes the minimum. [11] Level 30 Poison Dagger with 20 skill points each in Poison Explosion and Poison Nova applying a +800% (20*(20+20)) poison damage synergy bonus applies the following: Min bit rate = ((52*30)-524)*(100+800)/100 = (1560-524)*900/100 = 1036*9 = 9324 Min poison = 9324*340/256 = 12,383 Max bit rate = ((52*30)-480)*(100+800)/100 = (1560-480)*900/100 = 1080*9 = 9720 Max poison = 9720*340/256 = 12,909 Frames = 40+(10*30) = 40+300 = 340 0 Seconds = 340/25 = 13.6 Skill and items While most skills are 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 and Plague Javelins combine the skill's rate with any item rates. Length is calculated by summing skill and item lengths and dividing by the number of items. [12] Source Poison Damage Bit Rate Frames Min Max Seconds Min Max Toxic Small Charm of Anthrax 313 313 11.00 291 291 275 Blackbog's Sharp Cinquedeas 488 488 10.00 500 500 250 Perfect Emerald 100 100 7.16 143 143 179 Level 30 Poison Dagger 12,383 12,909 13.60 9324 9720 340 Total 10258 10654 1044 Min poison = 10258*348/256 = 13,944 Max poison = 10654*348/256 = 14,482 Seconds = [1,044/3]/25 = 13.92 If the only item used were Blackbog's Sharp Cinquedeas, 9824-10220 bit 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. Venom Venom's rate is applied to any weapon's attack made between its casting and expiration, and adds to any rate applied by items. However, its 10 frame length overrides those of any items. Source Poison Damage Bit Rate Frames Min Max Seconds Min Max Toxic Small Charm of Anthrax 313 313 11.00 291 291 275 Blackbog's Sharp Cinquedeas 488 488 10.00 500 500 250 Perfect Emerald 100 100 7.16 143 143 179 Level 15 Venom 305 325 0.40 7808 8320 10 Total 8742 9254 10 Min poison = 8742*10/256 = 341 Max poison = 9254*10/256 = 361 Seconds = 10/25 = 0.4 Venom's length does not override those of the skills Poison Dagger and Poison and Plague Javelins. 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. [13] Source Poison Damage Bit Rate Frames Min Max Seconds Min Max Toxic Small Charm of Anthrax 313 313 11.00 291 291 275 Blackbog's Sharp Cinquedeas 488 488 10.00 500 500 250 Perfect Emerald 100 100 7.16 143 143 179 Level 30 Poison Dagger 12,383 12,909 13.60 9324 9720 340 Level 15 Venom 305 325 0.40 7808 8320 10 Total 18066 18974 350 Min poison = 18066*350/256 = 24,699 Max poison = 18974*350/256 = 25,941 Seconds = 350/25 = 14 +% Poison Skill Damage Certain items apply a percentage increase to the rate which is applied after any +% poison damage synergy bonus to skill damage, and melee attack poison damage. Character screen displays +% PSD being applied to ranged attack poison damage as well, but this is not actually the case. When using two weapons +% PSD of both is applied to skill damage, or attack damage of either weapon when using a melee attack. Applies to damage when applied and missiles when created: if there is a delay between skill usage and damage or missile creation (as there can be with Poison and Plague Javelin clouds, and Rabies contagion missiles), switching weapons or other equipment to apply more +% PSD may result in more damage. Does not apply to pets summoned by the user, so it does not apply to Poison Creeper or Necromage missiles. [14] Applies to Venom attack damage before it is added, then again when using a melee attack. Equipping Trang-Oul's Claws Heavy Bracers applies +25% PSD to level 15 Venom when cast: Min bit rate = 7808*(100+25)/100 = 7808*1.25 = 9760 Max bit rate = 8320*(100+25)/100 = 8320*1.25 = 10400 Source Poison Damage Bit Rate Frames Min Max Seconds Min Max Toxic Small Charm of Anthrax 313 313 11.00 291 291 275 Blackbog's Sharp Cinquedeas 488 488 10.00 500 500 250 Perfect Emerald 100 100 7.16 143 143 179 Level 15 Venom 305 325 0.40 9760 10400 10 Total 10694 11334 10 Level 30 Poison Dagger 12,383 12,909 13.60 9324 9720 340 +25% PSD is now applied, resulting in the following poison damage over 14 ((340+10)/25) seconds: Min bit rate = (10694*(100+25)/100)+(9324*(100+25)/100) = (10694*1.25)+(9324*1.25) = 13367+11655 = 25022 Min poison = 25022*350/256 = 34,209 Max bit rate = (11334*(100+25)/100)+(9720*(100+25)/100) = (11334*1.25)+(9720*1.25) = 14167+12150 = 26317 Max poison = 26317*350/256 = 35,980 Lower Resist Target's Poison Resist reduces poison's rate, and PR >99% makes a monster Immune to Poison. Players and mercenaries normally have a PR 75% ceiling, although this can be increased to PR 95% by applying +% Maximum Poison Resist. Lower Resist applies PR -%, although it's applied at 1/5 effectiveness against Immune to Poison monsters: level 10 LR's PR -55% is reduced to PR -11% [55/5]. PR -100% is the floor. 25,022-26,317 bit rate for 350 frames results in 34,209-35,980 poison damage being applied over 14 seconds to a PR 0% target. Casting level 10 LR (PR -55%) results in the following: Min bit rate = 25022*(100-(0-55))/100 = 25022*(100+55)/100 = 25022*1.55 = 38784 Min poison = 38784*350/256 = 53,025 Max bit rate = 26317*(100-(0-55))/100 = 26317*(100+55)/100 = 26317*1.55 = 40791 Max poison = 40791*350/256 = 55,768 Frames = 350 0 0 0 Seconds = 350/25 = 14 LR is applied when the target is poisoned, so it can be overwritten by another curse immediately afterwards: even if LR is required to break immunity, once poison has been applied its rate and length remain unchanged, even if the monster becomes Immune to Poison again. [15] -% Enemy Poison Resistance Reduces a target's PR % like LR, but only if PR < 100% i.e. not Immune to Poison. However, unlike LR -% EPR also applies to length, effectively applying Poison Length Reduced by -%. [16] Monsters have no PLR % so -% EPR increases poison length by the displayed amount: PLR -100% is the floor. The only exceptions are the Ancients, whose equipment can spawn with PLR % suffixes: Korlic and Talic can spawn with PLR >99%, which always reduces poison length to a single frame. [17] Players and mercenaries have a PLR 75% ceiling, although the same difficulty level penalties that apply to Resist % apply (-40% in Nightmare and -100% in Hell). [18] Like LR, -% EPR is applied when the target is poisoned. Once poison has been applied its rate and length remain unchanged, so -% EPR can be removed afterwards without affecting damage or length. [19] 25,022-26,317 bit rate for 350 frames results in 34,209-35,980 poison damage being applied over 14 seconds to a PR 0% target. Casting level 10 LR (PR -55%) and equipping Trang-Oul's Wing Cantor Trophy with two other items from the set to apply its -25% EPR partial set bonus results in the following: Min bit rate = 25022*(100-(0-55-25))/100 = 25022*(100+80)/100 = 25022*1.8 = 45039 Min poison = 45039*437/256 = 76,882 Max bit rate = 26317*(100-(0-55-25))/100 = 26317*(100+80)/100 = 26317*1.8 = 47370 Max poison = 47370*437/256 = 80,862 Frames = 350*(100-(0-25))/100 = 350*(100+25)/100 = 350*1.25 = 437 Seconds = 437/25 = 17.48 Calculation Download Poison damage calculator.xls (onderduiker) Updated 24 March 2010 Online D2.de Skill Calc (inDiablo.de) 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 outlined in the preceding sections. 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 length + item lengths)/items Items + Venom = Venom length Skill + Venom = skill length + Venom length 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 bits and length in frames. It's also possible to calculate damage measuring rate in poison damage/second and length in seconds, which can be derived directly from displayed damage. 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. +% 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 a fraction of weapon damage. Two items will apply poison damage over the sum of their lengths, while three or more items will just apply poison damage over the longest length of any of those items. References Open Wounds (Technical Discussion) Schadensunterbrechung: Giftnova und anderer Schaden (inDiablo.de) Wiki Progress (Technical Discussion) Bkelly, The Tao of Poison (web.archive.org) Librarian, poison damage (FAQtoids) Meej, Clarifications on 1.10 Poison needed (Technical Discussion) Onderduiker, ANY damage stops unit damage regeneration (Technical Discussion) Onderduiker, Monster Resistances and Immunities Guide (Technical Discussion) Onderduiker, Poison and Plague Javelins (Javazon Room) Othin, Poison Basics (D2library)