DEF

OverviewData

This article is about the stat. For the Light Cone, see Defense.

DEF
Type	Combat Stats

DEF is one of the stats in Honkai: Star Rail, used by both characters and enemies. It is a stat that decreases DMG taken. Some character skills will also deal DMG or create shields based on DEF.

It multiplies incoming DMG by the following:

$\text{DEF Multiplier} = 1 - (\frac{\text{DEF}}{\text{DEF} + 200 + 10 \times \text{Level}_\text{Attacker}})$

When a unit's DEF becomes 0 due to DEF Reduction/Ignore, the DEF Multiplier will reach the cap of 100%.

Character DEF

Characters' Base DEF is determined by their level and their equipped Light Cone's level, while percentage and additive DEF bonuses can be obtained from Relics, Light Cone abilities, character skills, etc.

$\text{Base DEF} = (\text{DEF}_\text{Character} + \text{DEF}_\text{Light Cone})$

$\text{Total DEF} = \text{Base DEF} \times (1 + \% \text{DEF Bonus} - \% \text{DEF Reduction}) + \text{Additive DEF Bonus}$

Enemy DEF

Enemies' Base DEF is determined by their level:

$\text{Base DEF}_\text{Enemy} = 200 + 10 \times \text{Level}$

Therefore:

$\text{DEF Multiplier}_\text{Enemy} = \frac{\text{Level}_\text{Attacker} + 20}{(\text{Level}_\text{Enemy} + 20) \times (1 + \% \text{DEF Bonus} - \% \text{DEF Reduction} - \% \text{DEF Ignore}) + \text{Level}_\text{Attacker} + 20}$

The only exceptions to this are Trotters (e.g. Warp Trotter, Sequence Trotter, Trotter of Destruction), where:

$\text{Base DEF}_\text{Trotter} = 300 + 15 \times \text{Level}$

Abilities

Toggle Descriptions
1 ability increase DEF of characters:

Character	Name	Description	Type	Tag
Aventurine Aventurine	The Red or the Black The Red or the Black	After using the Technique, 1 of the following effects will be granted: There is a chance for DEF to increase by 24%. There is a high chance for DEF to increase by 36%. There is a small chance for DEF to increase by 60%. When this Technique is used repeatedly, the acquired effect with the highest buff value is retained. When the next battle starts, increases all allies' DEF by the corresponding value, lasting for 3 turn(s).	Technique	Defense

Toggle Descriptions
7 abilities reduce DEF of enemies:

Character	Name	Description	Type	Tag
Silver Wolf Silver Wolf	Awaiting System Response... Awaiting System Response...	Silver Wolf can create three types of Bugs: reduce ATK by 5%–11%, reduce DEF by 4%–8.8%, and reduce SPD by 3%–6.6%. Every time Silver Wolf attacks, she has a 60%–74.4% base chance to implant a random Bug that lasts for 3 turn(s) in the enemy target.	Talent	Impair
Black Swan Black Swan	Decadence, False Twilight Decadence, False Twilight	Deals Wind DMG equal to 45%—99% of Black Swan's ATK to a single target enemy and any adjacent targets. At the same time, there is a 100% base chance of inflicting 1 stack of Arcana on the target enemy and the adjacent targets. And there is a 100% base chance of reducing the DEF of the target enemy and the adjacent targets by 14.8%—22%, lasting for 3 turn(s).	Skill	Blast
Fugue Fugue	Percipient Shine Percipient Shine	After using Technique, inflicts Daze on enemies within a certain area, lasting for 10 second(s). While Dazed, enemies will not actively attack ally targets. After entering battle via actively attacking Dazed enemies, Fugue's action advances by 40%, with a 100% base chance to inflict each enemy target with the same DEF Reduction state as that applied by Fugue's Skill, lasting for 2 turn(s).	Technique	Impair
Pela Pela	Preemptive Strike Preemptive Strike	Immediately attacks the enemy. Upon entering battle, Pela deals Ice DMG equal to 80% of her ATK to a random enemy, with a 100% base chance of lowering the DEF of all enemies by 20% for 2 turn(s).	Technique
Silver Wolf Silver Wolf	User Banned User Banned	There's a 85%–103% base chance to decrease the target enemy's DEF by 36%–46.8% for 3 turn(s). And at the same time, deals Quantum DMG equal to 228%–410.4% of Silver Wolf's ATK to the target enemy.	Ultimate	Single Target
Fugue Fugue	Virtue Beckons Bliss Virtue Beckons Bliss	Grants one designated ally "Foxian Prayer". Enters the "Torrid Scorch" state, lasting for 3 turn(s). The duration reduces by 1 at the start of Fugue's every turn. "Foxian Prayer" only takes effect on the most recent target of Fugue's Skill. The ally target with "Foxian Prayer" increases their Break Effect by 15%—33% and can also reduce Toughness even when attacking enemies that don't have the corresponding Weakness Type, with the effect equivalent to 50% of the original Toughness Reduction value. This cannot stack with other Toughness Reduction effects that also ignore Weakness Type. While in the "Torrid Scorch" state, Fugue enhances her Basic ATK. Every time an ally target with "Foxian Prayer" attacks, Fugue has a 100% base chance to reduce the attacked enemy target's DEF by 8%—20%, lasting for 2 turn(s).	Skill	Support
Pela Pela	Zone Suppression Zone Suppression	Deals Ice DMG equal to 60%–108% of Pela's ATK to all enemies, with a 100% base chance to inflict Exposed on all enemies. When Exposed, enemies' DEF is reduced by 30%–42% for 2 turn(s).	Ultimate	AoE

Toggle Descriptions
1 ability ignore DEF of enemies:

Character	Name	Description	Type	Tag
Black Swan Black Swan	Loom of Fate's Caprice Loom of Fate's Caprice	Every time an enemy target receives DoT at the start of each turn, there is a 50%—68% base chance for it to be inflicted with Arcana. While afflicted with Arcana, enemy targets receive Wind DoT equal to 96%—264% of Black Swan's ATK at the start of each turn. Each stack of Arcana increases this DoT DMG multiplier by 4.8%—13.2%. Then Arcana resets to 1 stack. Arcana can stack up to 50 times. Only when Arcana causes DMG at the start of an enemy target's turn, Black Swan triggers additional effects based on the number of Arcana stacks inflicted on the target: When there are 3 or more Arcana stacks, deals Wind DoT equal to 72%—198% of Black Swan's ATK to adjacent targets, with a 50%—68% base chance of inflicting 1 stack of Arcana on adjacent targets. When there are 7 or more Arcana stacks, enables the current DoT dealt this time to ignore 20% of the target's and adjacent targets' DEF.	Talent	Impair

Bonus Abilities

Toggle Descriptions
3 Bonus Abilities increase DEF of characters:

Character	Name	Description	Ascension Requirement
Bronya Bronya	Battlefield Battlefield	At the start of the battle, all allies' DEF increases by 20% for 2 turn(s).	4
Trailblazer (Destruction) Trailblazer (Destruction)	Perseverance Perseverance	Each Talent stack increases the Trailblazer's DEF by 10%.	4
Asta Asta	Constellation Constellation	Asta's DEF increases by 6% for every current Charging stack she possesses.	6

Eidolons

Toggle Descriptions
2 Eidolons increase DEF of characters:

Character	Name	Description	Level
Aventurine Aventurine	Unexpected Hanging Paradox Unexpected Hanging Paradox	When triggering his Talent's follow-up attack, first increases Aventurine's DEF by 40% for 2 turn(s), and additionally increases the Hits Per Action for his talent's follow-up attack by 3.	4
Trailblazer (Preservation) Trailblazer (Preservation)	City-Forging Bulwarks City-Forging Bulwarks	After the Trailblazer use enhanced Basic ATK or Ultimate, their DEF increases by 10%. Stacks up to 3 time(s).	6

Toggle Descriptions
2 Eidolons reduce DEF of enemies:

Character	Name	Description	Level
Lingsha Lingsha	Bloom on Vileward Bouquet Bloom on Vileward Bouquet	Lingsha's Weakness Break Efficiency increases by 50%. When an enemy unit's Weakness is Broken, reduces their DEF by 20%.	1
Misha Misha	Yearning of Youth Yearning of Youth	Before each hit of the Ultimate lands, there is a 24% base chance of reducing the target's DEF by 16% for 3 turn(s).	2

Toggle Descriptions
9 Eidolons ignore DEF of enemies:

Character	Name	Description	Level
Boothill Boothill	File:Eidolon Dusty Trail's Lone Star (Eidolon).png Dusty Trail's Lone StarFile:Eidolon Dusty Trail's Lone Star (Eidolon).png Dusty Trail's Lone Star	When the battle starts, obtains 1 stack of Pocket Trickshot. When Boothill deals DMG, ignores 16% of the enemy target's DEF.	1
Firefly Firefly	In Reddened Chrysalis, I Once Rest In Reddened Chrysalis, I Once Rest	When using the Enhanced Skill, ignores 15% of the target's DEF. The Enhanced Skill does not consume Skill Points.	1
Sunday Sunday	Millennium's Quietus Millennium's Quietus	When Sunday uses Skill, the target character can ignore 16% of enemy target's DEF to deal DMG and their summon can ignore 40% of enemy target's DEF to deal DMG, lasting for 2 turn(s).	1
Ruan Mei Ruan Mei	Neuronic Embroidery Neuronic Embroidery	While the Ultimate's field is deployed, the DMG dealt by all allies ignores 20% of the target's DEF.	1
Rappa Rappa	Returned Is the Revenant With No Ferry Toll Returned Is the Revenant With No Ferry Toll	During the "Sealform" state entered by using Ultimate, DMG dealt by Rappa ignores 15% of the targets' DEF. After exiting the "Sealform" state, regenerates 20 Energy.	1
Yunli Yunli	First Luster Breaks Dawn First Luster Breaks Dawn	When dealing DMG via Counter, ignores 20% of the target's DEF.	2
Sparkle Sparkle	Purely Fictitious Purely Fictitious	Each Talent stack allows allies to ignore 8% of the enemy target's DEF when dealing DMG to enemies.	2
Jade Jade	Sincerity? Put Option Only Sincerity? Put Option Only	When using Ultimate, the DMG Jade deals ignores 12% of enemy targets' DEF, lasting for 3 turn(s).	4
Argenti Argenti	"Your" Resplendence "Your" Resplendence	When using Ultimate, ignores 30% of enemy targets' DEF.	6

Relic Sets

Toggle Set Bonuses
2 Relic Sets increase DEF of characters:

Icon	Set	Pieces	Bonuses
	Belobog of the Architects		2 Piece: Increases the wearer's DEF by 15%. When the wearer's Effect Hit Rate is 50% or higher, the wearer gains an extra 15% DEF.
	Knight of Purity Palace		2 Piece: Increases DEF by 15%. 4 Piece: Increases the max DMG that can be absorbed by the Shield created by the wearer by 20%.

Toggle Set Bonuses
3 Relic Sets ignore DEF of enemies:

Icon	Set	Pieces	Bonuses
	Genius of Brilliant Stars		2 Piece: Increases Quantum DMG by 10%. 4 Piece: When the wearer deals DMG to the target enemy, ignores 10% DEF. If the target enemy has Quantum Weakness, the wearer additionally ignores 10% DEF.
	Iron Cavalry Against the Scourge		2 Piece: Increases Break Effect by 16%. 4 Piece: If the wearer's Break Effect is 150% or higher, the Break DMG dealt to the enemy target ignores 10% of their DEF. If the wearer's Break Effect is 250% or higher, the Super Break DMG dealt to the enemy target additionally ignores 15% of their DEF.
	Prisoner in Deep Confinement		2 Piece: ATK increases by 12%. 4 Piece: For every DoT the target enemy is afflicted with, the wearer will ignore 6% of its DEF when dealing DMG to it. This effect is valid for a max of 3 DoTs.

Light Cones

Toggle Columns:
RarityPathStatsPassives
7 Light Cones increase DEF of characters:

Icon & Name	Rarity	Path	Stats	Passive
Amber		Preservation	Unknown	Stasis Increases the wearer's DEF by 16~32%. If the wearer's current HP is lower than 50%, increases their DEF by a further 16~32%.
Concert for Two		Preservation	HP: 43~952 ATK: 16~370 DEF: 21~463	Inspire Increases the wearer's DEF by 16~32%. For every on-field character that has a Shield, the DMG dealt by the wearer increases by 4~8%.
Day One of My New Life		Preservation	HP: 43~952 ATK: 16~370 DEF: 21~463	At This Very Moment Increases the wearer's DEF by 16~24%. After entering battle, increases All-Type RES of all allies by 8~12%. Abilities of the same type cannot stack.
Inherently Unjust Destiny		Preservation	HP: 48~1,058 ATK: 19~423 DEF: 30~661	All-In Increases the wearer's DEF by 40~64%. When the wearer provides a Shield to an ally, the wearer's CRIT DMG increases by 40~64%, lasting for 2 turn(s). When the wearer's follow-up attack hits an enemy target, there is a 100~160% base chance to increase the DMG taken by the attacked enemy target by 10.0~16.0%, lasting for 2 turn(s).
Moment of Victory		Preservation	HP: 48~1,058 ATK: 21~476 DEF: 27~595	Verdict Increases the wearer's DEF by 24~40% and Effect Hit Rate by 24~40%. Increases the chance for the wearer to be attacked by enemies. When the wearer is attacked, increase their DEF by an extra 24~40% until the end of the wearer's turn.
This Is Me!		Preservation	HP: 38~846 ATK: 16~370 DEF: 24~529	New Chapter Increases the wearer's DEF by 16~32%. Increases the DMG of the wearer when they use their Ultimate by 60~120% of the wearer's DEF. This effect only applies 1 time per enemy target during each use of the wearer's Ultimate.
Trend of the Universal Market		Preservation	HP: 48~1,058 ATK: 16~370 DEF: 18~396	A New Round of Shuffling Increases the wearer's DEF by 16~32%. When the wearer is attacked, there is a 100~120% base chance to Burn the enemy. For each turn, the wearer deals DoT that is equal to 40~80% of the wearer's DEF for 2 turn(s).

Toggle Columns:
RarityPathStatsPassives
1 Light Cone reduce DEF of enemies:

Icon & Name	Rarity	Path	Stats	Passive
Resolution Shines As Pearls of Sweat		Nihility	HP: 43~952 ATK: 21~476 DEF: 15~330	Glance Back When the wearer hits an enemy and if the hit enemy is not already Ensnared, then there is a 60~100% base chance to Ensnare the hit enemy. Ensnared enemies' DEF decreases by 12~16% for 1 turn(s).

Toggle Columns:
RarityPathStatsPassives
6 Light Cones ignore DEF of enemies:

Icon & Name	Rarity	Path	Stats	Passive
Baptism of Pure Thought		The Hunt	HP: 43~952 ATK: 26~582 DEF: 24~529	Mental Training Increases the wearer's CRIT DMG by 20~32%. For every debuff on the enemy target, the wearer's CRIT DMG dealt against this target additionally increases by 8~12%, stacking up to 3 times. When using Ultimate to attack the enemy target, the wearer receives the Disputation effect, which increases DMG dealt by 36~60% and enables their follow-up attacks to ignore 24~40% of the target's DEF. This effect lasts for 2 turns.
I Shall Be My Own Sword		Destruction	HP: 52~1,164 ATK: 26~582 DEF: 18~396	With This Evening Jade Increases the wearer's CRIT DMG by 20~32%. When an ally (excluding the wearer) gets attacked or loses HP, the wearer gains 1 stack of Eclipse, up to a max of 3 stack(s). Each stack of Eclipse increases the DMG of the wearer's next attack by 14.0~24.0%. When 3 stack(s) are reached, additionally enables that attack to ignore 12~20% of the enemy's DEF. This effect will be removed after the wearer uses an attack.
I Venture Forth to Hunt		The Hunt	HP: 43~952 ATK: 28~635 DEF: 21~463	Intimidation Increases the wearer's CRIT Rate by 15~25%. When the wearer launches a follow-up attack, gains 1 stack of "Luminflux," stacking up to 2 time(s). Each stack of "Luminflux" enables the Ultimate DMG dealt by the wearer to ignore 27~39% of the target's DEF. When the wearer's turn ends, removes 1 stack of "Luminflux."
Reforged Remembrance		Nihility	HP: 48~1,058 ATK: 26~582 DEF: 21~463	Crystallize Increases the wearer's Effect Hit Rate by 40~60%. When the wearer deals DMG to an enemy inflicted with Wind Shear, Burn, Shock, or Bleed, each respectively grants 1 stack of Prophet, stacking up to 4 time(s). In a single battle, only 1 stack of Prophet can be granted for each type of DoT. Every stack of Prophet increases wearer's ATK by 5~9% and enables the DoT dealt to ignore 7.2~10.0% of the target's DEF.
Sailing Towards a Second Life		The Hunt	HP: 48~1,058 ATK: 26~582 DEF: 21~463	Rough Water Increases the wearer's Break Effect by 60~100%. The Break DMG dealt by the wearer ignores 20~32% of the target's DEF. When the wearer's Break Effect in battle is at 150% or greater, increases their SPD by 12~20%.
Yet Hope Is Priceless		Erudition	HP: 43~952 ATK: 26~582 DEF: 24~529	Promise Increases the wearer's CRIT Rate by 16~28%. While the wearer is in battle, for every 20% CRIT DMG that exceeds 120%, the DMG dealt by follow-up attack increases by 12~20%. This effect can stack up to 4 time(s). When the battle starts or after the wearer uses their Basic ATK, enables the DMG dealt by Ultimate or follow-up attack to ignore 20~36% of the target's DEF, lasting for 2 turn(s).

Enemies

9 Enemies can reduce the DEF of an Enemy:

Enemy	Tier	Damage	Weakness
Dreamjolt Troupe's Beyond Overcooked	Elite
Dreamjolt Troupe's Beyond Overcooked (Bug)	Elite
Dreamjolt Troupe's Beyond Overcooked (Projection)	Elite
Dreamjolt Troupe's Sweet Gorilla	Elite
Dreamjolt Troupe's Sweet Gorilla (Bug)	Elite
Dreamjolt Troupe's Sweet Gorilla (Projection)	Elite
Entranced Ingenium: Illumination Dragonfish	Normal
Frigid Prowler	Elite
Frigid Prowler (Bug)	Elite

2 Enemies can increase the DEF of an Enemy:

Enemy	Tier	Damage	Weakness
Abundant Ebon Deer	Boss
Abundant Ebon Deer (Complete)	Boss

6 Enemies can reduce the DEF of characters:

Enemy	Tier	Damage	Weakness
"Present Inebriated in Revelry" (Bug)	Elite
"Present Inebriated in Revelry" (Complete)	Elite
Entranced Ingenium: Illumination Dragonfish	Normal
Silvermane Soldier	Normal
Svarog	Boss
Svarog (Complete)	Boss

3 Enemies can ignore the DEF of characters:

Enemy	Tier	Damage	Weakness
"Harmonious Choir" The Great Septimus	Echo of War
Destruction Lotus (Phase 2)	Normal
Destruction Lotus (Phase 3)	Normal

Consumables

There are 6 consumables:

Name	Effect	Type	Source	Recipe
Disposable Shield	When used, increase DEF of all allies by 15%, and Effect RES by 10% for the next battle.	Defense Consumables	Omni-Synthesizer	Available by default
High-Tech Protective Gear	Upon use, increases DEF of all allies by 15% and enhances the max DMG that can be absorbed by Shields cast on allies by 18% in the next battle.	Defense Consumables	Omni-Synthesizer	Supreme Guardian's desk in Qlipoth Fort after completion of Trailblaze Mission No Time for Me, My Friend
Inferior Protective Gear	Upon use, immediately causes all allies to lose HP equal to 15% of their Max HP, and increases their DEF by 15% for the next battle.	Defense Consumables	Omni-Synthesizer	Fidora
Sanctity of the Trashcan	Increase DEF of all allies by 20% in the next battle.	Defense Consumables	Trash Cans in Administrative District
Simple Protective Gear	Increase DEF of all allies by 25% in the next battle.	Defense Consumables	Omni-Synthesizer	Available by default
Sweet Dreams Holographic Ticket	Upon use, one of the following effects will be randomly applied to all allies in the next battle: Mirror Princess Edition — DEF increases by 36%. Miss Note Edition — Max HP increases by 30%.	Defense Consumables	Sold by Dreamville-Themed Restaurant

Other Languages

Language	Official Name
English	DEF
Chinese (Simplified)	防御力
Chinese (Traditional)	防禦力
Japanese	防御力
Korean	방어력
Spanish	DEF
French	DÉF
Russian	Защита
Thai	DEF
Vietnamese	Phòng Thủ
German	VTD
Indonesian	DEF
Portuguese	DEF

Change History

Released in Version 1.0

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