Honkai: Star Rail character

Mydei (Honkai: Star Rail)

Build and skills

  • 5-star
  • Combat type Imaginary
  • Path Destruction
  • Game data 4.6.0

HP-consuming damage dealer

Download Kaption How quick translate works
Mydei from Honkai: Star Rail with a Kaption Polish subtitle
How Kaption shows Mydei in Polish: ""Największy strach w głębi serca wojownika," co? ...Więc to jest to, czego boi się najbardziej?"

At a glance

  • Deaths are Legion, Regrets are None spends current HP; every 1% HP lost gives Mydei 1 Charge.
  • At 100 Charge, Mydei enters Vendetta and automatically uses Kingslayer Be King at the start of his turns.
  • At 150 Charge in Vendetta, Godslayer Be God fires on an extra turn; Charge can't build during the attack.
  • Use Throne of Bones for healing and 20 Charge; its target is prioritized by the next Godslayer Be God.
  • Vendetta leaves Mydei at 0 DEF; a killing blow clears Charge and heals 50% Max HP, and he stays in Vendetta the first 3 times per battle.

Video guide

*3.7 UPDATED* Mydei FULL In-Depth Guide | Kit, Best LC's, & Relic Sets (Honkai: Star Rail)

Video by Prеtender on YouTube · 16 min · 12K views · November 2025

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Build

From the game data

4× Scholar Lost in Erudition + 2× Bone Collection's Serene Demesne · Body HP% or CRIT DMG · Feet SPD or HP% · Planar sphere Imaginary DMG Boost or HP% · Link rope HP% · substats CRIT Rate > CRIT DMG > HP% > SPD

Relics and planar ornaments

4 pieces · Cavern relics

Pick one. The game lists them in this order.

  1. Scholar Lost in Erudition
    Scholar Lost in Erudition
    • 2-piece bonus: Increases CRIT Rate by 8%.
    Show effect
    • 4-piece bonus: Increases DMG dealt by Skill and Ultimate by 20%. After using Ultimate, additionally increases the DMG dealt by the next Skill by 25%.
  2. Longevous Disciple
    Longevous Disciple
    • 2-piece bonus: Increases Max HP by 12%.
    Show effect
    • 4-piece bonus: When the wearer is hit or has their HP consumed by an ally or themselves, their CRIT Rate increases by 8% for 2 turn(s) and up to 2 stacks.
  3. Wastelander of Banditry Desert
    Wastelander of Banditry Desert
    • 2-piece bonus: Increases Imaginary DMG by 10%.
    Show effect
    • 4-piece bonus: When dealing DMG to debuffed enemy targets, the wearer has their CRIT Rate increased by 10%. And when they deal DMG to Imprisoned enemy targets, their CRIT DMG increases by 20%.

2 pieces · Planar ornaments

Pick one. The game lists them in this order.

  1. Bone Collection's Serene Demesne
    Bone Collection's Serene Demesne
    • 2-piece bonus: Increases the wearer's Max HP by 12%. When the wearer's Max HP is 5000 or higher, increases the wearer's and their memosprite's CRIT DMG by 28%.
  2. Rutilant Arena
    Rutilant Arena
    • 2-piece bonus: Increases the wearer's CRIT Rate by 8%. When the wearer's current CRIT Rate reaches 70% or higher, DMG dealt by Basic ATK and Skill increases by 20%.
  3. Fleet of the Ageless
    Fleet of the Ageless
    • 2-piece bonus: Increases the wearer's Max HP by 12%. When the wearer's SPD reaches 120 or higher, all allies' ATK increases by 8%.

Main stats

Body
HP% or CRIT DMG
Feet
SPD or HP%
Planar sphere
Imaginary DMG Boost or HP%
Link rope
HP%

Substats

  1. CRIT Rate
  2. CRIT DMG
  3. HP%
  4. SPD

Target stats

Totals to aim for on the character's stat screen.

StatTarget
CRIT Rate 90–100% This target applies during combat.
CRIT DMG 150%+
SPD 134 Aim for 135 SPD or any higher SPD breakpoint.

Recommended light cones

  1. Flame of Blood, Blaze My Path
    Flame of Blood, Blaze My Path 5-star
    Vista Show effect

    Increases the wearer's Max HP by 18% and Incoming Healing by 20%. When using Skill or Ultimate, consumes HP equal to 6.0% of the wearer's Max HP and increases the DMG dealt by this attack by 30%. If this effect's consumed HP is greater than 500, the DMG additionally increases by 30%. If the current HP is not sufficient, this effect reduces the wearer's current HP down to 1.

  2. The Unreachable Side
    The Unreachable Side 5-star
    Unfulfilled Yearning Show effect

    Increases the wearer's CRIT Rate by 18% and increases their Max HP by 18%. When the wearer is attacked or consumes their own HP, their DMG increases by 24%. This effect is removed after the wearer uses an attack.

  3. Ninja Record: Sound Hunt
    Ninja Record: Sound Hunt 4-star
    Curtains Up! Show effect

    Increases the wearer's Max HP by 12%. When losing or restoring this unit's HP, increases CRIT DMG by 18%, lasting for 2 turn(s). This effect can only trigger once per turn.

Have this character? Make a card of your own build from your UID Stats, artifacts, weapon and talents from your in-game showcase, as a PNG in a dozen layouts.

Teams

Show more teams (4)Show less

Also plays in

Other characters' teams with a place for Mydei.

  • Summon/Memosprite

    Castorice

    • Castorice
    • Mydei
    • Tribbie
    • Gallagher

    HP-consuming damage dealer

  • Hypercarry

    Lynx

    • Lynx
    • Mydei
    • Sunday
    • Tribbie

    HP consuming primary attacker

  • Hypercarry

    Luocha

    • Luocha
    • Mydei
    • Sunday
    • Tribbie

    Main damage dealer

Skills

Names in English, as in the game · underlined ones open their card · Priority = level-up order (from the game data)

  1. Basic attack

    Vow of VoyageBasic

    Level priority 3 of 4

    Deals Imaginary DMG equal to 50% of Max HP to one enemy.

    Deals minor Imaginary DMG to one enemy.

    Full description

    Deals Imaginary DMG equal to 50% of Mydei's Max HP to one designated enemy.

  2. Skill

    Deaths are Legion, Regrets are NoneSkill

    Level priority 1 of 4

    Consumes 50% of current HP to deal 90% Max HP as Imaginary DMG to one enemy and 50% to adjacent targets. Leaves at least 1 HP.

    Consumes HP and deals Imaginary DMG to one designated enemy unit and minor Imaginary DMG to adjacent targets.

    Full description

    Consumes HP by an amount equal to 50% of Mydei's current HP. Deals Imaginary DMG equal to 90% of Mydei's Max HP to one designated enemy and Imaginary DMG equal to 50% of Mydei's Max HP to adjacent targets. If the current HP is not sufficient, using Skill reduces Mydei's current HP to 1.

  3. Ultimate

    Throne of BonesUlt

    Level priority 2 of 4

    Heals 20% Max HP, gains 20 Charge and deals 160%/100% Max HP as Imaginary DMG to the target and adjacent enemies. Taunts them for 2 turns.

    Restores HP and accumulates Talent's Charge. Deals massive Imaginary DMG to one designated enemy and Imaginary DMG to adjacent targets, then Taunts the target and their adjacent targets.

    Full description

    Restores HP by 20.0% of Mydei's Max HP and accumulates 20 Talent's Charge point(s). Deals Imaginary DMG equal to 160% of Mydei's Max HP to one designated enemy, and deals Imaginary DMG equal to 100% of Mydei's Max HP to adjacent targets. Additionally, Taunts the target and targets adjacent to it, lasting for 2 turn(s). The next use of "Godslayer Be God" prioritizes attacking one designated enemy, and this effect only works on the latest target.

  4. Talent

    Blood for BloodTalent

    Level priority 4 of 4

    At 100 Charge, consumes it to enter Vendetta: heals 25% Max HP, advances action by 100%, gains 50% Max HP and drops to 0 DEF.

    When losing HP, accumulates Charge. When Charge is at 100, enters the "Vendetta" state, restores HP and advances action. During "Vendetta," Max HP increases and DEF remains at 0. At the start of this unit's turn, automatically uses "Kingslayer Be King." When Charge reaches 150 during "Vendetta," Mydei immediately gains 1 extra turn and automatically uses "Godslayer Be God." When Mydei receives a killing blow, he exits the "Vendetta" state.

    Full description

    For each 1% of HP lost, accumulates 1 point of Charge (up to 200 points). When Charge reaches 100, consumes 100 points of Charge to enter the "Vendetta" state, restores HP equal to 25% of Mydei's Max HP, and advances action by 100%. While the "Vendetta" state is active, Max HP increases by 50% of the current Max HP and DEF remains at 0. At the start of this unit's turn, automatically uses "Kingslayer Be King." When Charge reaches 150 points during the "Vendetta" state, Mydei immediately gains 1 extra turn and automatically uses "Godslayer Be God." When receiving a killing blow during the "Vendetta" state, Mydei will not be knocked down, but will clear his Charge, exits the "Vendetta" state, and restores HP by 50% of his Max HP.

  5. Technique

    Cage of Broken LanceTechnique

    Pulls and Dazes enemies for 10s. Attacking them starts battle with 80% Max HP as Imaginary DMG to all, 1-turn Taunt and 50 Charge.

    Pulls in enemies within a certain area and inflicts Daze on them. After attacking Dazed enemies and entering battle, deals minor Imaginary DMG to all enemies and Taunts the targets. This unit accumulates Talent's Charge.

    Full description

    After using Technique, pulls in enemies within a certain area and inflicts Daze on them for 10 second(s). Dazed enemies will not actively attack ally targets. If actively attacking Dazed enemies, when entering battle, deals Imaginary DMG equal to 80% of Mydei's Max HP to all enemies, and Taunts the targets, lasting for 1 turn(s). This unit accumulates 50 point(s) of Talent's Charge.

  6. Skill

    Kingslayer Be KingSkill

    Used automatically in Vendetta. Consumes 35% of current HP to deal 110%/66% Max HP as Imaginary DMG to the target and adjacent enemies.

    Consumes HP. Deals Imaginary DMG to one designated enemy and Imaginary DMG to adjacent targets. This ability will be automatically used.

    Full description

    Consumes HP by an amount equal to 35% of Mydei's current HP. Deals Imaginary DMG equal to 110% of Mydei's Max HP to one enemy and Imaginary DMG equal to 66% of Mydei's Max HP to adjacent targets. If the current HP is not sufficient, using Skill reduces Mydei's current HP to 1. This ability will be automatically used.

  7. Skill

    Godslayer Be GodSkill

    At 150 Charge in Vendetta, takes an extra turn and automatically spends 150 Charge to deal 280%/168% Max HP as Imaginary DMG.

    Consumes Charge. Deals massive Imaginary DMG to one designated enemy and massive Imaginary DMG to adjacent targets. This ability will be automatically used.

    Full description

    Consumes 150 point(s) of Charge. Deals Imaginary DMG equal to 280% of Mydei's Max HP to one enemy and Imaginary DMG equal to 168% of Mydei's Max HP to adjacent targets. This ability will be automatically used. While this ability is in use, Charge cannot be accumulated.

Passives

  1. Passive

    Earth and WaterPassive

    Up to 3 times per battle, a killing blow doesn't end Vendetta.

    During the "Vendetta" state, Mydei will not exit the "Vendetta" state when receiving a killing blow. This effect can trigger 3 time(s) per battle.

  2. Passive

    Thirty TyrantsPassive

    During Vendetta, Mydei is immune to Crowd Control debuffs.

    While in the "Vendetta" state, Mydei is immune to Crowd Control debuffs.

  3. Passive

    Bloodied ChitonPassive

    At battle start, each 100 Max HP above 4,000 gives 1.2% CRIT Rate, 2.5% enemy DMG Charge ratio and 0.75% healing received, up to 4,000 excess HP.

    When battle starts, if Mydei's Max HP exceeds 4000, for every 100 excess HP, Mydei's CRIT Rate increases by 1.2%, his Charge ratio from enemy targets' DMG increases by 2.5%, and his HP restored when receiving healing increases by 0.75%. Up to 4000 excess HP can be taken into account for this effect.

Eidolons

  1. E1

    Frost Hones Spine of Steel

    Increases the DMG multiplier dealt by "Godslayer Be God" to the primary target by 30%. This ability now deals to all enemies Imaginary DMG equal to the DMG multiplier dealt to the primary target.

  2. E2

    Strife Beholds Cry of Dead

    During "Vendetta," the DMG dealt by Mydei ignores 15% of enemy targets' DEF. After he receives healing, converts 40% of the healed amount to Charge. The tally of the converted Charge cannot exceed 40 point(s). Resets this tally of Charge after any unit takes action.

  3. E3

    Honor Exalts Feast of Faith

    Skill Lv. +2, up to a maximum of Lv. 15. Basic ATK Lv. +1, up to a maximum of Lv. 10.

  4. E4

    Siren Jolts the Laconic Lion

    While in "Vendetta," increases CRIT DMG by 30% and restores HP by 10% of this unit's Max HP after receiving attacks from enemy targets.

  5. E5

    War Chisels Flesh of Flame

    Ultimate Lv. +2, up to a maximum of Lv. 15. Talent Lv. +2, up to a maximum of Lv. 15.

  6. E6

    Legacy Scales Mound of Blood

    When entering battle, immediately enters the "Vendetta" state, and lowers the Charge required for "Godslayer Be God" to 100 point(s).

Materials

Ascension, to max level

  • Credit Credit × 308,000
  • Harbinger of Strife Harbinger of Strife × 65
  • Fear-Stomped Flesh Fear-Stomped Flesh × 15
  • Courage-Torn Chest Courage-Torn Chest × 15
  • Glory-Aspersed Torso Glory-Aspersed Torso × 15

All skills to max

  • Credit Credit × 3,000,000
  • Tracks of Destiny Tracks of Destiny × 8
  • Borisin Teeth Borisin Teeth × 18
  • Lupitoxin Sawteeth Lupitoxin Sawteeth × 69
  • Moon Rage Fang Moon Rage Fang × 139
  • Auspice Sliver Auspice Sliver × 12
  • Fear-Stomped Flesh Fear-Stomped Flesh × 41
  • Courage-Torn Chest Courage-Torn Chest × 56
  • Glory-Aspersed Torso Glory-Aspersed Torso × 58

Mydei in Polish

Story lines the way Kaption shows them in Polish, with the English original underneath.

  • Mydei · Strife, Dispel the Accompanying Fears "Największy strach w głębi serca wojownika," co? ...Więc to jest to, czego boi się najbardziej? "The greatest fear in the depths of a warrior's heart," huh? ...So, this is what he fears the most?
  • Mydei · Strife, Dispel the Accompanying Fears Dość tych bzdur. Powinieneś używać swojej broni jako bóg Walki! Walcz ze mną i zakończ to szybko! Enough of this nonsense. You should be wielding your weapon as the god of Strife! Battle me and put a swift end to this!
  • Mydei · Strife, Dispel the Accompanying Fears Jej tragiczna śmierć była spowodowana przez ciebie, ucieleśnienie Strife. Jak śmiesz mówić o jej przeszłości? Her tragic death was caused by you, the incarnation of Strife. How dare you talk about her past?
  • Mydei · Wasteland, Hark Back Glory of Old Te twoje urojenia naprawdę mnie denerwują! These delusions of yours are seriously getting on my nerves!
  • Mydei · Hero, Return to That Peace of Home Hm! I co z tego, że został tylko jeden świadek Ery Nova? Hmph! So what if there's only one person left to witness the Era Nova?
  • Mydei · Strife, Dispel the Accompanying Fears (Tam jest. Czy on toczy debatę z tym głupim lwem?) (There he is. Is he engaged in a debate with that foolish lion?)
  • Mydei · Ferryman, Ferry Me Across the Stream of Souls Czy masz... jakiś plan, by złamać kajdany naszego losu? Do you have... a strategy to shatter the shackles of our fate?
  • Mydei · Nemesis, Scorched by Golden Blood Chodź! Włócznia Kremnoan zawsze trafia w cel — Sam los ukształtuje moją końcówkę włóczni! Come! The Kremnoans' spear always finds their mark — Fate itself shall forge my speartip!

Frequently asked questions

What's the best build for Mydei?

Relics and planar ornaments: Scholar Lost in Erudition ×4 + Bone Collection's Serene Demesne ×2. Main stats: Body: HP% or CRIT DMG, Feet: SPD or HP%, Planar sphere: Imaginary DMG Boost or HP%, Link rope: HP%. Recommended light cones: Flame of Blood, Blaze My Path, The Unreachable Side or Ninja Record: Sound Hunt. That is what the game suggests.

What should I level first on Mydei?

Deaths are Legion, Regrets are NoneSkill first, then Throne of BonesUlt, Vow of VoyageBasic and Blood for BloodTalent. That is what the game suggests.

Who should Mydei team up with?

Good teammates: Cyrene, Robin • Summeretto and Hyacine.

Is Mydei in Polish in Honkai: Star Rail?

The game has no Polish language option. Kaption shows Polish subtitles for the dialogue right on the game screen, so Mydei's lines read in Polish. Skill and item names stay in English, as in the game.

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Game data version 4.6.0.

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