What each boss actually hits you with, and which rune answers it. Every attack in this game carries a list of damage types, and those types are what your damage reduction runes key off. Pick the ones that match what you are fighting and you take measurably less; pick the wrong one and the slot does nothing.

Built from 108 boss encounters in the 0630 game files. There are no HP or ATK numbers here on purpose: boss stats scale with your chapter and account, so any single figure would be wrong for almost everyone.

1What every boss doesthe two runes that are almost always right

Damage type	Bosses		Rune that reduces it
WeaponAttack	108 of 108	100%	no rune reduces this
BasicAttack	107 of 108	99%	Basic Attack DMG Reduction
PhysicalDamage	100 of 108	93%	Physical DMG Reduction
RageAttack	93 of 108	86%	no rune reduces this
MagicalDamage	30 of 108	28%	no rune reduces this
Skill	29 of 108	27%	no rune reduces this
CounterAttack	12 of 108	11%	Counter Attack DMG Reduction
Fire	11 of 108	10%	Fire DMG Reduction
ComboAttack	9 of 108	8%	Combo Attack DMG Reduction
Ice	9 of 108	8%	Ice DMG Reduction
Icicle	2 of 108	2%	no rune reduces this
Poison	2 of 108	2%	no rune reduces this
Wound	2 of 108	2%	no rune reduces this

The default pair. Basic Attack DMG Reduction works on 107 of 108 bosses and Physical DMG Reduction on 100. If you are not building for a specific fight, those two are the safe slots.

Lightning DMG Reduction is dead weight against bosses. Not one of the 108 bosses deals Lightning damage, so that rune reduces nothing in a boss fight. It can still matter against ordinary enemies.

2What no rune stopsplan around these instead

Behaviour	Bosses	What it means
Restoration	9	heals itself
TrueDamage	8	skips your DEF and every damage reduction
Lifesteal	7	heals from the damage it deals
Shield	6	shields itself
Thorns	5	damages you when you hit it
IgnoreShield	4	goes through shields
RampantRage	1	builds rage faster

Damage reduction will not save you from these. A boss that heals needs you to out-damage the healing, and one that hits through shields makes shield skills a waste of a slot in that fight.

3Crimson Nightmarethe saga event, stage by stage

The event runs three stages, 9 boss fights in all. Only 7 of them are against a creature the game itself tags as a Boss, so DMG vs Boss does nothing in the other 2. The badge on each fight says which is which. Ice only comes from Stage 1, so Ice DMG Reduction earns its slot there and nowhere else in this event.

Stage 13 boss fights, 10 encounters

Boss fights

Clown FreakBOSSBasicAttackPhysicalDamageRageAttackSkeleton DragonBOSSBasicAttackIceMagicalDamagePhysicalDamageRageAttackVallatioBOSSBasicAttackPhysicalDamageRageAttackWound

Also in this stage

Zombie ClownBasicAttackPhysicalDamageGhost KnightBasicAttackCleavePhysicalDamageSkeleton RingmasterBasicAttackMagicalDamageRageAttack

Stage 23 boss fights, 12 encounters

Boss fights

KitsuraBOSSBasicAttackPhysicalDamageRageAttackStumpyBOSSBasicAttackPhysicalDamageRageAttackThe MonsterELITEBasicAttackPhysicalDamageRageAttack

Also in this stage

Living TreeBasicAttackPhysicalDamageWolf SpiderBasicAttackPhysicalDamageSkeleton ArcherBasicAttackPhysicalDamage

Stage 33 boss fights, 12 encounters

Boss fights

HydraNORMALBasicAttackPhysicalDamageTrueDamageRed DemonBOSSBasicAttackIgnoreShieldPhysicalDamageTrueDamageDemon Lord VallatioBOSSBasicAttackPhysicalDamageRageAttackWound

Also in this stage

Fallen AdventurerBasicAttackPhysicalDamageShurikenSkeleton KnightBasicAttackPhysicalDamageImpBasicAttackPhysicalDamage

4Crystal Expeditionthe saga event, stage by stage

The event runs three stages, 9 boss fights in all. Only 7 of them are against a creature the game itself tags as a Boss, so DMG vs Boss does nothing in the other 2. The badge on each fight says which is which. Ice only comes from Stage 3, so Ice DMG Reduction earns its slot there and nowhere else in this event.

Stage 13 boss fights, 10 encounters

Boss fights

Giant SlimeBOSSBasicAttackComboAttackCounterAttackPhysicalDamageCorvusBOSSBasicAttackPhysicalDamageRageAttackGoblin OgreBOSSBasicAttackPhysicalDamageRageAttack

Also in this stage

SlimeBasicAttackPhysicalDamageWolfBasicAttackPhysicalDamageCave SpiderBasicAttackPhysicalDamage

Stage 23 boss fights, 13 encounters

Boss fights

Haunted TreeBOSSBasicAttackPhysicalDamageRageAttackBansheeELITEBasicAttackMagicalDamagePhysicalDamageRageAttackAncient MyconidBOSSBasicAttackPhysicalDamage

Also in this stage

ShroomBasicAttackPhysicalDamageLiving TreeBasicAttackPhysicalDamageDesert HornetBasicAttackPhysicalDamage

Stage 33 boss fights, 12 encounters

Boss fights

Crystal ConstructBOSSBasicAttackPhysicalDamageRageAttackThe First SeekerELITEBasicAttackPhysicalDamageRageAttackCrysalith WyrmBOSSBasicAttackIceMagicalDamagePhysicalDamageRageAttack

Also in this stage

Crystal SlimeBasicAttackIceIcicleMagicalDamagePhysicalDamageFallen AdventurerBasicAttackPhysicalDamageShurikenGhost KnightBasicAttackCleavePhysicalDamage

5City of Goldthe saga event, stage by stage

The event runs three stages, 9 boss fights in all. Only 5 of them are against a creature the game itself tags as a Boss, so DMG vs Boss does nothing in the other 4. The badge on each fight says which is which. Fire only comes from Stage 1, so Fire DMG Reduction earns its slot there and nowhere else in this event.

Stage 13 boss fights, 10 encounters

Boss fights

IlluminaBOSSBasicAttackMagicalDamagePhysicalDamageRageAttackTrueDamageRedbeard, also called BlackbeardELITEBasicAttackPhysicalDamageRageAttackGoblin MageBOSSBasicAttackFireMagicalDamageRageAttack

Also in this stage

WolfBasicAttackPhysicalDamagePirateBasicAttackPhysicalDamageGoblin GruntBasicAttackPhysicalDamage

Stage 23 boss fights, 12 encounters

Boss fights

Stone ElementalELITEBasicAttackCounterAttackPhysicalDamageThornsGoblin BallistaELITEPhysicalDamageRageAttackHydra TyrantNORMALBasicAttackPhysicalDamageTrueDamage

Also in this stage

Water SpriteBasicAttackPhysicalDamageGoblin HunterBasicAttackPhysicalDamageSkyshroomBasicAttackPhysicalDamage

Stage 33 boss fights, 12 encounters

Boss fights

MinotaurBOSSBasicAttackPhysicalDamageRageAttackCity GuardianBOSSBasicAttackPhysicalDamageRageAttackThe Golden KingBOSSBasicAttackComboAttackCounterAttackPhysicalDamageRageAttack

Also in this stage

ScorpionBasicAttackPhysicalDamageGolden WarriorBasicAttackPhysicalDamageMummy WarriorBasicAttackPhysicalDamage

6Magma Mountain: Eruptionthe saga event, stage by stage

The event runs three stages, 9 boss fights in all. Only 5 of them are against a creature the game itself tags as a Boss, so DMG vs Boss does nothing in the other 4. The badge on each fight says which is which. All three stages carry Fire, so Fire DMG Reduction is the event pick on top of your usual Physical.

Stage 13 boss fights, 12 encounters

Boss fights

Undead CommanderELITEBasicAttackComboAttackCounterAttackPhysicalDamageRageAttackDracoBOSSBasicAttackFireMagicalDamagePhysicalDamageRageAttackRampantRageSkeleton KingBOSSBasicAttackComboAttackCounterAttackPhysicalDamageRageAttack

Also in this stage

Skeleton WarriorBasicAttackPhysicalDamageSkeleton MageBasicAttackMagicalDamageRageAttackSkeleton ArcherBasicAttackPhysicalDamageFire SpriteBasicAttackFireMagicalDamage

Stage 23 boss fights, 14 encounters

Boss fights

Big FootELITEBasicAttackPhysicalDamageRageAttackTribal ChiefELITEBasicAttackFireMagicalDamagePhysicalDamageRageAttackMagma ElementalBOSSBasicAttackCounterAttackPhysicalDamageThorns

Also in this stage

Cave SpiderBasicAttackPhysicalDamageDesert HornetBasicAttackPhysicalDamageTribal WarriorBasicAttackPhysicalDamageScorpionBasicAttackPhysicalDamage

Stage 33 boss fights, 14 encounters

Boss fights

Goblin MageBOSSBasicAttackFireMagicalDamageRageAttackRed SlimeELITEBasicAttackLifestealPhysicalDamageRageAttackRestorationMolten ConstructBOSSBasicAttackFireMagicalDamagePhysicalDamageRageAttack

Also in this stage

Goblin GruntBasicAttackPhysicalDamageSkeleton MinerBasicAttackPhysicalDamageFire SpriteBasicAttackFireMagicalDamageScorpionBasicAttackPhysicalDamage

7Every boss108 encounters flagged as a boss

DMG vs Boss only works on the ones tagged BOSS. The rune checks the creature you are hitting, not whether the fight is a boss fight, and only 61 of these 108 encounters contain a creature the game tags as a Boss. In the other 47 the rune adds nothing at all, and neither does it against a boss's escorts: an ELITE does not count. The same is true in reverse for DMG Reduction vs Boss, which only reduces damage from a BOSS-tagged attacker.

Boss	Tagged	Also deals	Runes that help
Akkorokamui	ELITE	PhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Akkorokamui (Hard)	ELITE	PhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Ancient Construct	BOSS	PhysicalDamageRageAttackShield	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Ancient Construct (Chaos)	BOSS	PhysicalDamageRageAttackShield	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Ancient Construct (Hard)	BOSS	PhysicalDamageRageAttackShield	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Ancient Myconid (Crystal Expedition)	BOSS	PhysicalDamage	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Anubis	BOSS	IgnoreShieldPhysicalDamageTrueDamage	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Anubis (Chaos)	BOSS	IgnoreShieldLifestealPhysicalDamageRestorationTrueDamage	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Anubis (Hard)	BOSS	IgnoreShieldLifestealPhysicalDamageRestorationTrueDamage	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Banshee	ELITE	MagicalDamagePhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Banshee (Crystal Expedition)	ELITE	MagicalDamagePhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Banshee (Hard)	ELITE	MagicalDamagePhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Bastet	ELITE	ComboAttackPhysicalDamageRageAttack	Basic Attack DMG Reduction, Combo Attack DMG Reduction, Physical DMG Reduction
Bastet (Hard)	ELITE	ComboAttackPhysicalDamageRageAttack	Basic Attack DMG Reduction, Combo Attack DMG Reduction, Physical DMG Reduction
Big Foot (Magma Mountain)	ELITE	PhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
City Guardian	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Clown Freak (Crimson Nightmare)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Corvus (Crystal Expedition)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Crysalith Wyrm (Crystal Expedition)	BOSS	IceMagicalDamagePhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Ice DMG Reduction, Physical DMG Reduction
Crystal Construct (Crystal Expedition)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Demon Lord Vallatio (Crimson Nightmare)	BOSS	PhysicalDamageRageAttackWound	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Draco (Magma Mountain)	BOSS	FireMagicalDamagePhysicalDamageRageAttackRampantRage	DMG vs Boss, Basic Attack DMG Reduction, Fire DMG Reduction, Physical DMG Reduction
Drowned Captain	ELITE	PhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Drowned Captain (Hard)	ELITE	PhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Gecko Dinosaur 1	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Gecko Dinosaur 2	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Gecko Dinosaur 3	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Giant Slime (Crystal Expedition)	BOSS	ComboAttackCounterAttackPhysicalDamage	DMG vs Boss, Basic Attack DMG Reduction, Combo Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Goblin Ballista (City of Gold)	ELITE	PhysicalDamageRageAttack	Physical DMG Reduction
Goblin Engineer Goblin Ballista	ELITE	PhysicalDamageRageAttackRestoration	Basic Attack DMG Reduction, Physical DMG Reduction
Goblin Engineer Goblin Ballista (Hard)	ELITE	PhysicalDamageRageAttackRestoration	Basic Attack DMG Reduction, Physical DMG Reduction
Goblin Mage	ELITE	FireMagicalDamageRageAttack	Basic Attack DMG Reduction, Fire DMG Reduction
Goblin Mage (City of Gold)	BOSS	FireMagicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Fire DMG Reduction
Goblin Mage (Hard)	ELITE	FireMagicalDamageRageAttack	Basic Attack DMG Reduction, Fire DMG Reduction
Goblin Ogre	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Goblin Ogre (Chaos)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Goblin Ogre (Crystal Expedition)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Goblin Ogre (Hard)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Haunted Tree (Crystal Expedition)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Hydra (Crimson Nightmare)	NORMAL	PhysicalDamageTrueDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Hydra Tyrant (City of Gold)	NORMAL	PhysicalDamageTrueDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Hydra Tyrant (Hard)	NORMAL	PhysicalDamageTrueDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Ice Dragon	BOSS	IceMagicalDamagePhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Ice DMG Reduction, Physical DMG Reduction
Ice Dragon (Chaos)	BOSS	IceIcicleMagicalDamagePhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Ice DMG Reduction, Physical DMG Reduction
Ice Dragon (Hard)	BOSS	IceIcicleMagicalDamagePhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Ice DMG Reduction, Physical DMG Reduction
Ifrit	BOSS	FireMagicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Fire DMG Reduction
Ifrit (Chaos)	BOSS	FireMagicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Fire DMG Reduction
Ifrit (Hard)	BOSS	FireMagicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Fire DMG Reduction
Illumina (City of Gold)	BOSS	MagicalDamagePhysicalDamageRageAttackTrueDamage	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Kitsura (Crimson Nightmare)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Kraken	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Kraken (Chaos)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Kraken (Hard)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Leviathan	BOSS	PhysicalDamageRageAttackShield	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Leviathan (Chaos)	BOSS	PhysicalDamageRageAttackShield	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Leviathan (Hard)	BOSS	PhysicalDamageRageAttackShield	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Magma Elemental (Hard)	BOSS	CounterAttackPhysicalDamageThorns	DMG vs Boss, Basic Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Magma Elemental (Magma Mountain)	BOSS	CounterAttackPhysicalDamageThorns	DMG vs Boss, Basic Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Magma Elemental (Magma Mountain)	BOSS	CounterAttackPhysicalDamageThorns	DMG vs Boss, Basic Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Medusa	ELITE	MagicalDamagePhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Medusa (Hard)	ELITE	MagicalDamagePhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Minotaur (Chaos)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Minotaur (City of Gold)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Minotaur (Hard)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Molten Construct (Hard)	BOSS	FireMagicalDamagePhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Fire DMG Reduction, Physical DMG Reduction
Molten Construct (Magma Mountain)	BOSS	FireMagicalDamagePhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Fire DMG Reduction, Physical DMG Reduction
Molten Construct (Magma Mountain)	BOSS	FireMagicalDamagePhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Fire DMG Reduction, Physical DMG Reduction
Mummy General Mummy Warrior x2	ELITE	PhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Mummy General Mummy Warrior x2 (Hard)	ELITE	PhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Pirate Captain	ELITE	PhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Pirate Captain (Hard)	ELITE	PhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Red Demon (Crimson Nightmare)	BOSS	IgnoreShieldPhysicalDamageTrueDamage	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Red Slime	ELITE	LifestealPhysicalDamageRageAttackRestoration	Basic Attack DMG Reduction, Physical DMG Reduction
Red Slime (Hard)	ELITE	LifestealPhysicalDamageRageAttackRestoration	Basic Attack DMG Reduction, Physical DMG Reduction
Red Slime (Magma Mountain)	ELITE	LifestealPhysicalDamageRageAttackRestoration	Basic Attack DMG Reduction, Physical DMG Reduction
Redbeard, also called Blackbeard (City of Gold)	ELITE	PhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Siren	ELITE	MagicalDamagePhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Siren (Hard)	ELITE	MagicalDamagePhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
Skeleton Commander (Hard) x2	ELITE	ComboAttackCounterAttackPhysicalDamageRageAttack	Basic Attack DMG Reduction, Combo Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Skeleton Commander (Undead Commander in Magma Mountain)	ELITE	ComboAttackCounterAttackPhysicalDamageRageAttack	Basic Attack DMG Reduction, Combo Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Skeleton Dragon (Crimson Nightmare)	BOSS	IceMagicalDamagePhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Ice DMG Reduction, Physical DMG Reduction
Skeleton King	BOSS	ComboAttackCounterAttackPhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Combo Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Skeleton King (Chaos)	BOSS	ComboAttackCounterAttackPhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Combo Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Skeleton King (Hard)	BOSS	ComboAttackCounterAttackPhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Combo Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Stone Elemental	ELITE	CounterAttackPhysicalDamageThorns	Basic Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Stone Elemental (Hard)	ELITE	CounterAttackPhysicalDamageRageAttackThorns	Basic Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Stumpy	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Stumpy (Chaos)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Stumpy (Crimson Nightmare)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Stumpy (Hard)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
The Abomination	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
The Abomination (Chaos)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
The Abomination (Hard)	BOSS	PhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
The First Seeker (Crystal Expedition)	ELITE	PhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
The Golden King (City of Gold)	BOSS	ComboAttackCounterAttackPhysicalDamageRageAttack	DMG vs Boss, Basic Attack DMG Reduction, Combo Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
The Monster (Crimson Nightmare)	ELITE	PhysicalDamageRageAttack	Basic Attack DMG Reduction, Physical DMG Reduction
The Sewer Dweller	ELITE	MagicalDamagePoisonRageAttack	Basic Attack DMG Reduction
The Sewer Dweller (Hard)	ELITE	MagicalDamagePoisonRageAttack	Basic Attack DMG Reduction
The Sludge	ELITE	LifestealPhysicalDamageRageAttackRestoration	Basic Attack DMG Reduction, Physical DMG Reduction
The Sludge (Hard)	ELITE	LifestealPhysicalDamageRageAttackRestoration	Basic Attack DMG Reduction, Physical DMG Reduction
Tribal Chief (Magma Mountain)	ELITE	FireMagicalDamagePhysicalDamageRageAttack	Basic Attack DMG Reduction, Fire DMG Reduction, Physical DMG Reduction
Troll Cultist x3	ELITE	IceMagicalDamagePhysicalDamageRageAttack	Basic Attack DMG Reduction, Ice DMG Reduction, Physical DMG Reduction
Troll Cultist x3 (Hard)	ELITE	IceMagicalDamagePhysicalDamageRageAttack	Basic Attack DMG Reduction, Ice DMG Reduction, Physical DMG Reduction
Vallatio	BOSS	PhysicalDamageRageAttackWound	DMG vs Boss, Basic Attack DMG Reduction, Physical DMG Reduction
Wolf Pack	ELITE	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Wolf Pack (Hard)	ELITE	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Yeti	ELITE	IceMagicalDamagePhysicalDamageRageAttack	Basic Attack DMG Reduction, Ice DMG Reduction, Physical DMG Reduction
Yeti (Hard)	ELITE	IceMagicalDamagePhysicalDamageRageAttack	Basic Attack DMG Reduction, Ice DMG Reduction, Physical DMG Reduction

8Guild Raid and Dojoone opponent, and it is not a boss

These two modes put you in front of a single enemy, and the game files treat that enemy as an ordinary creature: not one of them is tagged Boss, and neither mode flags its fight as a boss fight. So DMG vs Boss and DMG Reduction vs Boss are both worth nothing here, however much the enemy looks the part.

Guild Raidthree targets, one per season

Chain WardenNORMALTrueDamageHydraNORMALTrueDamageOgre OppressorNORMALTrueDamage

Damage reduction does nothing in a raid. All six of their attacks are TrueDamage, and that tag skips the whole mitigation step: your DEF is never read and not one damage reduction applies, the boss ones included. What still works is anything that stops a hit rather than shrinking it: a shield absorbs it and an active mount takes it for you, because none of these attacks ignore shields or mounts, and first hit immunity zeroes it outright.

Dojofive training enemies

Black BeltNORMALno attacks at allSenseiNORMALno attacks at allStraw DummyNORMALno attacks at allWhite BeltNORMALno attacks at allWood DummyNORMALno attacks at all

The Dojo opponent does not fight back. Not one of the five carries a single attack or skill, so it deals no damage at all. The Dojo is scored on the damage you deal, so a defensive slot is wasted there.

9Every normal enemy44 creatures outside the boss fights

The same damage types decide what your runes do here. One row per creature, not per encounter: the game spawns most of these in ones, twos and threes and that changes nothing about what they hit you with. None of these is tagged Boss, so DMG vs Boss is worth nothing against any of them.

Enemy	Also deals	Runes that help
Cave Spider	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Crystal Slime	IceIcicleMagicalDamagePhysicalDamage	Basic Attack DMG Reduction, Ice DMG Reduction, Physical DMG Reduction
Dead Sailor	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Desert Hornet	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Drowned Sailor	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Fallen Adventurer	PhysicalDamageShuriken	Basic Attack DMG Reduction, Physical DMG Reduction
Fire Sprite	FireMagicalDamage	Basic Attack DMG Reduction, Fire DMG Reduction
Fish Monster	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Ghost Knight	CleavePhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Goblin Grunt	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Goblin Hunter	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Golden Warrior	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Hero Spirit	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Imp	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Living Tree	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Marine Fungus	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Mummy Warrior	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Pirate	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Plague Stinger	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Red Slime	LifestealPhysicalDamageRageAttackRestoration	Basic Attack DMG Reduction, Physical DMG Reduction
Sahagin	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Satyr	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Scorpion	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Shroom	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Skeleton Archer	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Skeleton Commander	ComboAttackCounterAttackPhysicalDamageRageAttack	Basic Attack DMG Reduction, Combo Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Skeleton Hoplite	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Skeleton Knight	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Skeleton Mage	MagicalDamageRageAttack	Basic Attack DMG Reduction
Skeleton Miner	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Skeleton Ringmaster	MagicalDamageRageAttack	Basic Attack DMG Reduction
Skeleton Warrior	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Skyshroom	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Slime	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Snow Spider	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Snow Wolf	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Stone Elemental	CounterAttackPhysicalDamageThorns	Basic Attack DMG Reduction, Counter Attack DMG Reduction, Physical DMG Reduction
Tribal Warrior	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Troll Warrior	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Vile Fungus	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Water Sprite	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Wolf	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Wolf Spider	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction
Zombie Clown	PhysicalDamage	Basic Attack DMG Reduction, Physical DMG Reduction

Every boss listed here is flagged as a boss encounter in the game files. Damage types come from each attack's own tag list, including the skills a boss carries, not just its basic attack. The BOSS, ELITE and NORMAL tags are the creature's own rank in the game files, which is what DMG vs Boss reads, and it is not the same thing as the fight being a boss fight. Rebuilt from game version 0630.