Damage regeneration

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• Units other than players can regenerate damage automatically, based on a fraction of their maximum life:

Value	Maximum Life		0-100% Life (Seconds)
	/Frame	/Second
2	2/4096	50/4096 (~1.22%)	~82
3	3/4096	75/4096 (~1.83%)	~55
4	4/4096	100/4096 (~2.44%)	~41
5	5/4096	125/4096 (~3.05%)	~33
6	6/4096	150/4096 (~3.66%)	~28
10	10/4096	250/4096 (~6.10%)	~17
12	12/4096	300/4096 (~7.32%)	~14
15	15/4096	375/4096 (~9.15%)	~11

[1]

• Units do not regenerate in frames in which they take as little as 1 bit (1/256 point) damage. Consequently skills applying damage every frame (like Immolation Arrow pyres and Fire Wall) can stop regeneration entirely, those applying damage every other frame (like Inferno and Arctic Blast) effectively half regeneration, and attacking or casting more frequently will reduce regeneration. [2] [3]
• Units do not regenerate while poison damage or Open Wounds are being applied.
• Monsters do not regenerate after Prevent Monster Heal has been applied, with the exception of Pandemonium Event bosses.

Hireling

Damage Regen
4	10
Rogue Scout Desert Mercenary Iron Wolf	Barbarian

Pet

Damage Regen
2	3	4	5	12	15
Bone Prison Bone Wall Shadow Master	Blood Golem Carrion Vine Clay Golem Fire Golem Heart of Wolverine Iron Golem Oak Sage Poison Creeper Shadow Warrior Solar Creeper Spirit of Barbs	Dire Wolf Necromage Necroskeleton Spirit Wolf	Grizzly	Valkyrie	Decoy

Monster

• Super Unique monsters do not regenerate damage.

Damage Regen
0	2	3	4	5	6
Andariel Baal Baal clone Blood Raven Diablo Duriel Hephasto Izual Korlic Madawc Mephisto Nihlathak Radament The Smith The Summoner Talic Barricade Barricaded Door Barricaded Tower Catapult Council Member Diablo bone prison Evil Demon Hut Fire Tower Gargoyle Trap Lightning Spire Prison Door	Diablo clone Griswold Abominable Abyss Knight Baal's Minion Baboon Demon Bat Demon Blood Hawk Blood Hawk Nest Blood Lord Blow Pipe Fetish Bone Fetish Claw Viper Corrupt Rogue Corrupt Rogue Archer CR Spearwoman Death Mauler Demon Imp Doom Knight Fallen Fallen Shaman Festering Appendage Fetish Fetish Shaman Finger Mage Flying Scimitar Frog Demon Frozen Horror Giant Mosquito Goatman Guardian 6 Unraveler 7 Horadrim Ancients 8 9 Hell Bovine Leaper Megademon Minion of Destruction Mummy Mummy Sarcophagus Oblivion Knight Hell Whip 5 Pain Worm Putrid Defiler Reanimated Horde Regurgitator Sabre Cat Sand Maggot Sand Maggot Egg Sand Maggot Young Sand Raider Dung Soldier 1 1 1 Siege Beast Skeleton Skeleton Archer Skeleton Mage Slinger Spike Fiend Stygian Fury Succubus Suicide Minion Swarm Tainted Tentacle Beast Trapped Soul Vile Child Vile Mother Vulture Demon Wendigo Willowisp Window Wraith Zakarum Priest Zakarum Zealot Zombie	Blunderbore 5 Mauler 6 Giant Spider Greater Mummy Overseer Death Beetle 2 2 2 2 Vampire	Lilith Uber Baal Uber Diablo Uber Duriel Uber Izual Uber Mephisto Blunderbore Scarab 3 3 3 Thorned Hulk	Steel Scarab 4 4 Blood Lord 6 Ghoul Lord 7 Dark Lord 8 9	Scarab Demon Arach 6 7

Reference

• Schadensunterbrechung: Giftnova und anderer Schaden (inDiablo.de)
• Librarian, life regeneration of non-player units (FAQtoids)
• Onderduiker, ANY damage stops unit damage regeneration (Technical Discussion)