D2R Items With Open Wounds

Open Wounds is a D2R combat mechanic that appears as a Chance on Hit mod on several Unique, Set or Rune Word items. The game will roll for the chance for the mechanic to occur on every eligible melee or ranged attack. If the effect occurs, it causes the monster to bleed profusely, causing them to lose health. The effect lasts for 8 seconds.

Health Lost

The amount of health the monster loses is scaled with the player's level. It scales fairly linearly, doing about 800 damage over 8 seconds at level 50, and about 2135 damage over 8 seconds at level 90.
When triggered by a ranged attack, the bleed damage is divided by 2.
When targeted on a player, the bleed damage is divided by 4. (So 1/8 the damage for ranged attacks on players)
When targeted on Uniques or Bosses, the bleed damage is divided by 2 (Causes 1/4 damaged for ranged on bosses)
Item modifiers for Open Wounds generally stack, unless a character is wielding two weapons, the chances do not cross between weapons.

Health Regeneration

While under the effects of Open wounds, a Monster's natural health regeneration is set to a negative value. This means that monsters cannot regenerate health while affected by Open Wounds. This makes it a valuable stat for fighting monsters with high health regeneration.

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D2R Open Wounds

This is a chance of making a monster bleed uncontrollably. They lose health while bleeding. Open Wounds Items stack in most cases.

Duration: 200 frames (that is 8 seconds).

The damage per frame seems to be the following (where Clvl is the attackers level, that is the player's level usually):

Clvl=1-15: (9*Clvl+31)/256
Clvl=16-30: (18*Clvl-104)/256
Clvl=31-45: (27*Clvl-374)/256
Clvl=46-60: (36*Clvl-779)/256
Clvl=61-99: (45*Clvl-1319)/256

If you prefer per second, just multiply by 25:

Clvl=1-15: 25*(9*Clvl+31)/256
Clvl=16-30: 25*(18*Clvl-104)/256
Clvl=31-45: 25*(27*Clvl-374)/256
Clvl=46-60: 25*(36*Clvl-779)/256
Clvl=61-99: 25*(45*Clvl-1319)/256

Some examples:

Clvl 10: 11.8 per sec over 8 seconds for a total of 94.5 damage. Clvl 30: 42.6 per sec over 8 seconds for a total of 340.6 damage. Clvl 50: 99.7 per sec over 8 seconds for a total of 797.7 damage. Clvl 70: 178.8 per sec over 8 seconds for a total of 1430.5 damage. Clvl 90: 266.7 per sec over 8 seconds for a total of 2133.6 damage.

Also, the damage is divided by 4 for a player target. In addition, for a missile versus a player target one should divide the damage by 8 instead.

Finally, versus bosses and champions (could be just bosses or special bosses) the damage is divided by 2.

It is possible to get up to 100% chance for Open Wounds. Anything above 100% is discarded.

Um Rune

Name	Level	Weapon	Armor/Helm/Shields	Upgrade Recipes
Um Rune	47	25% Chance of Open Wounds	Armor: +15% Resist All Shield: +22 Resist All	2x Pul Rune, 1x Flawed Diamond

Open Wounds Runewords

Runewords	Allowed Items	Runewords Recipes	Level	Complete Stats
Steel	2 Socket Swords/ 2 Socket Axes/ 2 Socket Maces	Tir Rune + El Rune	13	20% Enhanced Damage +3 To Minimum Damage +3 To Maximum Damage +50 To Attack Rating 50% Chance Of Open Wounds 25% Increased Attack Speed +2 To Mana After Each Kill +1 To Light Radius
Malice	3 Socket Melee Weapons	Ith Rune + El Rune + Eth Rune	15	+33% Enhanced Damage +9 To Maximum Damage 100% Chance Of Open Wounds -25% Target Defense -100 To Monster Defense Per Hit Prevent Monster Heal +50 To Attack Rating Drain Life -5
Kingslayer	4 Socket Swords/ 4 Socket Axes	Mal Rune + Um Rune + Gul Rune + Fal Rune	53	+30% Increased Attack Speed +230-270% Enhanced Damage -25% Target Defense 20% Bonus To Attack Rating 33% Chance of Crushing Blow 50% Chance of Open Wounds +1 To Vengeance Prevent Monster Heal +10 To Strength 40% Extra Gold From Monsters
Fury	3 Socket Melee Weapons	Jah Rune + Gul Rune + Eth Rune	65	+209% Enhanced Damage 40% Increased Attack Speed Prevent Monster Heal 66% Chance Of Open Wounds 33% Deadly Strike Ignore Target's Defense -25% Target Defense 20% Bonus To Attack Rating 6% Life Stolen Per Hit +5 To Frenzy (Barbarian Only)
Duress	3 Socket Chest Armor	Shael Rune + Um Rune + Thul Rune	47	+40% Faster Hit Recovery +10-20% Enhanced Damage Adds 37-133 Cold Damage 2 sec. Duration (Normal) 15% Chance of Crushing Blow 33% Chance of Open Wounds +150-200% Enhanced Defense -20% Slower Stamina Drain Cold Resistance +45% Lightning Resistance +15% Fire Resistance +15% Poison Resistance +15%
Doom	5 Socket Axes/ 5 Socket Polearms/ 5 Socket Hammers	Hel Rune + Ohm Rune + Um Rune + Lo Rune + Cham Rune	67	5% Chance To Cast Level 18 Volcano On Striking Level 12 Holy Freeze Aura When Equipped +2 To All Skills +45% Increased Attack Speed +330-370% Enhanced Damage -(40-60)% To Enemy Cold Resistance 20% Deadly Strike 25% Chance of Open Wounds Prevent Monster Heal Freezes Target +3 Requirements -20%
Crescent Moon	3 Socket Axes/ 3 Socket Swords/ 3 Socket Polearms	Shael Rune + Um Rune + Tir Rune	47	10% Chance To Cast Level 17 Chain Lightning On Striking 7% Chance To Cast Level 13 Static Field On Striking +20% Increased Attack Speed +180-220% Enhanced Damage Ignore Target's Defense -35% To Enemy Lightning Resistance 25% Chance of Open Wounds +9-11 Magic Absorb +2 To Mana After Each Kill Level 18 Summon Spirit Wolf (30 Charges)
Chaos	3 Socket Claws	Fal Rune + Ohm Rune + Um Rune	57	9% Chance To Cast Level 11 Frozen Orb On Striking 11% Chance To Cast Level 9 Charged Bolt On Striking +35% Increased Attack Speed +290-340% Enhanced Damage Adds 216-471 Magic Damage 25% Chance of Open Wounds +1 To Whirlwind +10 To Strength +15 Life After Each Demon Kill
Beast	5 Socket Axes/ 5 Socket Scepters/ 5 Socket Hammers	Ber Rune + Tir Rune + Um Rune + Mal Rune + Lum Rune	63	Level 9 Fanaticism Aura When Equipped +40% Increased Attack Speed +240-270% Enhanced Damage 20% Chance of Crushing Blow 25% Chance of Open Wounds +3 To Werebear +3 To Lycanthropy Prevent Monster Heal +25-40 To Strength +10 To Energy +2 To Mana After Each Kill Level 13 Summon Grizzly (5 Charges)

Crafting Recipes

Crafted Item	Crafting Recipes	Fixed Effects
Blood Belt	Magic Belt/Mesh Belt/Mithril Coil Tal Rune Perfect Ruby Any Jewel	Open Wounds (5-10)% (1-3)% Life Stolen Per Hit +(10-20) To Life