Mydei
Last updated 2026-03-03
Mydei, full name Mydeimos, is a playable character in Honkai: Star Rail.
Kremnos, swallowed by mist! City riven between chaos and war! The blood of patricide flows through its royal line, and its god bears the title of calamity.
The undying Mydeimos, the lion apart from the rest. O Chrysos Heir that seeks the Coreflame of Strife, you must suffer a thousand deaths, be bathed in blood on the path home, and bear the madness of fate alone, for one was must slay a god to become one. Iron-hooves pound across the wilderness for the campaign, and must eventually soak in the blood of their homeland.[14]
Combat Info
Ascensions and Stats
| Ascension Phase | Level | Base HP | Base ATK | Base DEF | Base SPD | Ascension Costs |
|---|---|---|---|---|---|---|
| 0✦ | 1/20 | 211 | 58 | 26 | 95 | (0 → 1) |
| 20/20 | 411 | 113 | 51 | 95 | ||
| Ascension Cost (0 → 1) | ||||||
| 1✦ | 20/30 | 496 | 136 | 62 | 95 | (1 → 2) |
| 30/30 | 601 | 165 | 75 | 95 | ||
| Ascension Cost (1 → 2) | ||||||
| 2✦ | 30/40 | 686 | 188 | 85 | 95 | (2 → 3) |
| 40/40 | 792 | 217 | 99 | 95 | ||
| Ascension Cost (2 → 3) | ||||||
| 3✦ | 40/50 | 876 | 241 | 109 | 95 | (3 → 4) |
| 50/50 | 982 | 270 | 122 | 95 | ||
| Ascension Cost (3 → 4) | ||||||
| 4✦ | 50/60 | 1,066 | 293 | 133 | 95 | (4 → 5) |
| 60/60 | 1,172 | 322 | 146 | 95 | ||
| Ascension Cost (4 → 5) | ||||||
| 5✦ | 60/70 | 1,256 | 345 | 157 | 95 | (5 → 6) |
| 70/70 | 1,362 | 374 | 170 | 95 | ||
| Ascension Cost (5 → 6) | ||||||
| 6✦ | 70/80 | 1,446 | 397 | 180 | 95 | — |
| 80/80 | 1,552 | 426 | 194 | 95 | ||
308,000 CreditAbilities
| Icon | Type | Name | Tag | Energy | Toughness Reduction | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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 | Basic ATK | Vow of Voyage | Single Target | Generation: 20 | 10 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | Skill | Deaths are Legion, Regrets are None | Blast | Generation: 30 | 20 (Main) 10 (Adjacent) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Consumes HP by an amount equal to 50% of Mydei's current HP. Deals Imaginary DMG equal to 45%—99% of Mydei's Max HP to one designated enemy and Imaginary DMG equal to 25%—55% of Mydei's Max HP to adjacent targets.
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 | Skill | Kingslayer Be King | Blast | Generation: 30 | 20 (Main) 10 (Adjacent) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Consumes HP by an amount equal to 35% of Mydei's current HP. Deals Imaginary DMG equal to 55%—121% of Mydei's Max HP to one enemy and Imaginary DMG equal to 33%—72.6% of Mydei's Max HP to adjacent targets.
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 | Skill | Godslayer Be God | Blast | Generation: 10 | 30 (Main) 20 (Adjacent) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Consumes 150 point(s) of Charge. Deals Imaginary DMG equal to 140%—308% of Mydei's Max HP to one enemy and Imaginary DMG equal to 84%—184.8% of Mydei's Max HP to adjacent targets.
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 | Ultimate | Throne of Bones | Blast | Cost: 160 Generation: 5 | 20 (Main) 20 (Adjacent) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Restores HP by 15%—21% of Mydei's Max HP and accumulates 20 Talent's Charge point(s). Deals Imaginary DMG equal to 96%—172.8% of Mydei's Max HP to one designated enemy, and deals Imaginary DMG equal to 60%—108% 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.
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 | Talent | Blood for Blood | Enhance | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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 15%—27% 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."
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 | Technique | Cage of Broken Lance | Impair | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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.
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Traces
| Trace Level | Required Ascension | Credits [Subtotal] | Character Ascension Materials and Trace Materials [Subtotal] | Trace Materials [Subtotal] |
|---|---|---|---|---|
| 1 → 2 | 2✦ | 5,000 [5,000] |  6 [6] |  3 [3] |
| 2 → 3 | 3✦ | 10,000 [15,000] |  3 [3] |  3 [3] |
| 3 → 4 | 4✦ | 20,000 [35,000] | 4 [7] | 5 [8] |
| 4 → 5 | 5✦ | 45,000 [80,000] |  3 [3] |  3 [3] |
| 5 → 6 | 6✦ | 160,000 [240,000] | 4 [7] | 8 [11] |
240,000 Credit| Trace Level | Required Ascension | Credits [Subtotal] | Character Ascension Materials and Trace Materials [Subtotal] | Trace Materials [Subtotal] | ||
|---|---|---|---|---|---|---|
| 1 → 2 | 1✦ | 2,500 [2,500] | 3 [3] | |||
| 2 → 3 | 2✦ | 5,000 [7,500] | 6 [9] | 3 [3] | ||
| 3 → 4 | 3✦ | 10,000 [17,500] | 3 [3] | 3 [3] | ||
| 4 → 5 | 4✦ | 20,000 [37,500] | 4 [7] | 5 [8] | ||
| 5 → 6 | 30,000 [67,500] | 6 [13] | 7 [15] | |||
| 6 → 7 | 5✦ | 45,000 [112,500] | 3 [3] | 3 [3] | ||
| 7 → 8 | 80,000 [192,500] | 4 [7] | 5 [8] |  1 [1] | ||
| 8 → 9 | 6✦ | 160,000 [352,500] | 8 [16] | 1 [2] |  1 [1] | |
| 9 → 10 | 300,000 [652,500] | 14 [30] | 1 [3] | 1 [2] | ||
652,500 Credit CRIT DMG BoostCRIT DMG increases by 5.3% | |||
 Earth and WaterDuring the "Vendetta" state, Mydei will not exit the "Vendetta" state when receiving a killing blow. This effect can trigger 3 time(s) per battle. Req. Character Ascension 2 |
 HP BoostMax HP increases by 4.0% Req. Character Ascension 2 |
CRIT DMG Boost CRIT DMG increases by 5.3% Req. Character Ascension 3 |
 SPD BoostSPD increases by 2 Req. Character Ascension 3 |
 Thirty TyrantsWhile in the "Vendetta" state, Mydei is immune to Crowd Control debuffs. Req. Character Ascension 4 |
CRIT DMG Boost CRIT DMG increases by 8.0% Req. Character Ascension 4 |
HP Boost Max HP increases by 6.0% Req. Character Ascension 5 |
CRIT DMG Boost CRIT DMG increases by 8.0% Req. Character Ascension 5 |
 Bloodied ChitonWhen 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 Incoming Healing increases by 0.75%. Up to 4000 excess HP can be taken into account for this effect. Req. Character Ascension 6 |
SPD Boost SPD increases by 3 Req. Character Ascension 6 |
HP Boost Max HP increases by 8.0% Req. Character Lv. 75 | |
| CRIT DMG Boost CRIT DMG increases by 10.7% Req. Character Lv. 80 | |||
Eidolons
| Icon | Name | Level |
|---|---|---|
 | Frost Hones Spine of Steel | 1 |
| 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. | ||
 | Strife Beholds Cry of Dead | 2 |
| 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. | ||
 | Honor Exalts Feast of Faith | 3 |
| Skill Lv. +2, up to a maximum of Lv. 15. Basic ATK Lv. +1, up to a maximum of Lv. 10. | ||
 | Siren Jolts the Laconic Lion | 4 |
| 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. | ||
 | War Chisels Flesh of Flame | 5 |
| Ultimate Lv. +2, up to a maximum of Lv. 15. Talent Lv. +2, up to a maximum of Lv. 15. | ||
 | Legacy Scales Mound of Blood | 6 |
| When entering battle, immediately enters the "Vendetta" state, and lowers the Charge required for "Godslayer Be God" to 100 point(s). | ||
Achievements
There are 4 Achievements related to Mydei:
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Name | Category | Description | Hidden | Version | 
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The Gate of Fire, The Endless Might | Eager for Battle | In a single battle, have ally character Mydei cast "Kingslayer Be King" or "Godslayer Be God" 5 time(s) in 1 instance(s) of "Vendetta" | Yes | 3.1 | 5 |
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One Against Thousands | Eager for Battle | Defeat 1 Elite Enemy target(s) and achieve victory with only ally character Mydei surviving in the team | Yes | 3.1 | 5 |
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Who's the MVP? | Eager for Battle | Win 1 battle with a team comprising Phainon and Mydei, and have (Mydei defeat more enemies than Phainon/Phainon defeat more enemies than Mydei/Mydei and Phainon defeat the same number of enemies) | Yes | 3.4 | 5 |
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A Drop of the Soul Brew | The Memories We Share | Once the brewery is back in business, craft a fresh bottle of soul brew | Yes | 3.5 | 5 |
Availability
Event Warps
Mydei has been promoted or featured with a drop-rate boost in 2 Event Warps:
| Warp | Featured | Duration | Version |
|---|---|---|---|
 Fiery Lionheart 2025-03-19 |
  Mydei |
March 19, 2025 – April 8, 2025 | 3.1 |
 Indelible Coterie 2025-11-26 |
Mydei |
November 26, 2025 – December 16, 2025 | 3.7 |
Other Languages
Mydei
| Language | Official Name |
|---|---|
| English | Mydei |
| Chinese (Simplified) | 万敌 |
| Chinese (Traditional) | 萬敵 |
| Japanese | モーディス |
| Korean | 마이데이 |
| Spanish | Midei |
| French | Mydei |
| Russian | Мидей |
| Thai | Mydei |
| Vietnamese | Mydei |
| German | Mydei |
| Indonesian | Mydei |
| Portuguese | Mydei |
Mydeimos
| Language | Official Name |
|---|---|
| English | Mydeimos |
| Chinese (Simplified) | 迈德谟斯 |
| Chinese (Traditional) | 邁德謨斯 |
| Japanese | メデイモス |
| Korean | 마이데이모스 |
| Spanish | Mideimos |
| French | Mydeimos |
| Russian | Мидеймос |
| Thai | Mydeimos |
| Vietnamese | Mydeimos |
| German | Mydeimos |
| Indonesian | Mydeimos |
| Portuguese | Mydeimos |
Change History
- Updates to character voice-overs:
- New voice-over for All Languages:
- "About Hysilens"
- "About Cerydra"
- "About March 7th"
- "About Dan Heng • Permansor Terrae"
- "About Cyrene"
- "Added to Team With Hysilens"
- "Added to Team With Cerydra"
- "Added to Team With March 7th"
- "Added to Team With Dan Heng • Permansor Terrae"
- "Added to Team With Cyrene"
- Updated text for English:
- "Added to Team With Tribbie"
- Old: "Stay back — I alone am enough."
- New: "Stay back. I alone am enough."
- "Added to Team With Tribbie"
- New voice-over for All Languages:
- Updates to character voice-overs:
- Updated text for English:
- "Annoyances"
- Old: Castrum Kremnos and Okhema have long been at odds. A spear can pierce the enemy king, but it cannot resolve the deep grudges of the people.
- New: Castrum Kremnos and Okhema have long been at odds. A spear can pierce through the enemy king, but it cannot resolve the deep grudges of the people.
- "Annoyances"
- Updated text for English:
- Updates to character voice-overs:
- New voice-over for All Languages:
- "Added to Team With Phainon"
- New voice-over for All Languages:
- Updates to character voice-overs:
- New voice-over for All Languages:
- "About Hyacine"
- "About Cipher"
- "Added to Team With Hyacine"
- "Added to Team With Cipher"
- New voice-over for All Languages:
- Updates to character voice-overs:
- New voice-over for All Languages:
- "About Anaxa"
- "Added to Team With Castorice"
- "Added to Team With Anaxa"
- New voice-over for All Languages:
- Mydei was released as a playable character.
- Mydei was released as an overworld NPC in "Eternal Holy City" Okhema.
- Mydei was introduced as an upcoming playable character.
- Mydei was introduced in Golden Epic Trailer — "Amphoreus' Saga of Heroes."
References
- ↑ Trailblaze Mission, Light Slips the Gate, Shadow Greets the Throne: Throne, End Those Long Years Forlorn
- ↑ Honkai: Star Rail (September 24, 2025). Myriad Celestia Trailer — "Amphoreus' Saga of Heroes". YouTube. Retrieved September 24, 2025.
- ↑ Relic, World-Remaking Deliverer: Deliverer's Boots of Pioneering
- ↑ Trailblaze Mission, As Tomorrow Became Yesterday: Hero, Return to Dawn in Mortality
- ↑ Mission Item: Imperial Ring of Strife
- ↑ 6.0 6.1 As I've Written, δ-me13.exe, Experiment Progress: Eternal Recurrence, Electrical Signal Sequence (Active): PoleMos600
- ↑ Trailblaze Mission, Before Their Deaths: Time, Ferry Me Through Ages
- ↑ Trailblaze Mission, For the Sun is Set to Die: Hero, Shatter That Woeful Effigy
Lygus: The golden blood flowing in your veins... It comes from The Blemished One, whose name is "Destruction" itself. And Amphoreus's Chrysos Heirs were, from the very beginning, fuel for the Aeon to burn the universe. - ↑ Trailblaze Mission, Light Slips the Gate, Shadow Greets the Throne: Nemesis, Scorched by Golden Blood
- ↑ Trailblaze Mission, Light Slips the Gate, Shadow Greets the Throne: Throne, End Those Long Years Forlorn
- ↑ Mydei's Voice-Over: Something to Share
- ↑ Honkai: Star Rail (February 14, 2025). Version 3.1 "Light Slips the Gate, Shadow Greets the Throne" Trailer. YouTube. Retrieved February 14, 2025.
- ↑ 13.0 13.1 13.2 Chinese Character Reveal, Honkai: Star Rail Weibo. Retrieved December 28, 2024.
- ↑ 14.0 14.1 Character Reveal, Honkai: Star Rail Twitter. Retrieved December 28, 2024.
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