Mydei | Honkai: Star Rail

Overview

Mydei is an HP-scaling Destruction DPS who converts HP loss into Charge and automatic enhanced attacks during Vendetta. His protection can prevent a killing blow, but outside Vendetta he still needs healing and careful sustain.

Role

Main DPS / HP-Scaling

Playstyle

Use Skill to lose HP and build Charge until reaching 100 Charge, which activates Vendetta. From there, Mydei mostly plays automatically while you use Ultimate to heal, gain Charge, taunt enemies, and control the target of his strongest attack.

Why It Works

Every 1% HP lost grants 1 Charge, while being attacked also accelerates his rotation. Vendetta dramatically increases his Max HP, letting him repeatedly sacrifice enormous amounts of HP without actually becoming fragile.

Watch For

Vendetta forces most of Mydei's actions into automatic targeting, so target-sensitive fights can be awkward. Use Ultimate to mark the enemy you want his next Godslayer Be God to prioritize.

Playstyle

Combat Flow

Skill / lose HP → 100 Charge → Vendetta → Enhanced Skill → build 150 Charge → Godslayer Be God → Ultimate/heal + Charge → repeat.

Key Notes

Aim for 8000 HP outside combat, around 90–100% CRIT Rate in combat, and 160%+ CRIT DMG. Either base SPD or 134+ SPD works depending on the setup.
Ultimate heals 20% Max HP, grants 20 Charge, and Taunts enemies.
Vendetta increases his Max HP by 50% but sets DEF to 0.

Build & Investment

Light Cones

Primary

Flame of Blood, Blaze My Path

Signature option built for HP consumption and Mydei's damage conversion.

Alternative

The Unreachable Side

Strong HP and CRIT premium alternative.

Relics

Primary

Scholar Lost in Erudition

Strong Skill/Ultimate damage set for his Vendetta sequence.

Alternative

Longevous Disciple

HP and CRIT alternative with easy activation from self-damage.

Planars

Primary

Bone Collection's Serene Demesne

Adds Max HP and grants CRIT DMG at 5000 Max HP, matching Mydei's HP-scaled attacks.

Alternative

Rutilant Arena

Skill-damage alternative after meeting the CRIT threshold.

Main Stats

Body

CRIT DMG
AlternativeCRIT Rate

Preferred when the build has enough CRIT Rate.

Use for ratio consistency.

Feet

SPD
AlternativeHP%

Default for more self-driven cycles.

Slower high-HP alternative with action support.

Sphere

Imaginary DMG Boost
AlternativeHP%

Default offensive sphere.

Close alternative with stronger substats.

Rope

HP%

Core scaling rope.

Recommended Substats

HP%
CRIT Rate
CRIT DMG
SPD

Build HP toward Bloodied Chiton's entry-HP cap before balancing the remaining CRIT. Count its conditional CRIT Rate bonus to avoid overcapping, and choose SPD around support action order. His main damage scales with Max HP, so ATK is not a substitute.

Eidolon Investment

E0 supplies Vendetta and the HP-loss Charge loop. Establish reliable healing and Charge generation first; extra Eidolons change his damage coverage or add healing-based Charge without removing those needs.

Flame of Blood, Blaze My Path adds Max HP and incoming healing, then consumes HP to strengthen Skill and Ultimate attacks. The extra damage condition checks the amount of HP consumed, so his HP build matters.

Godslayer Be God's primary multiplier increases, and the attack applies its primary-target multiplier to every enemy.

During Vendetta, adds DEF ignore and converts part of healing into Charge, with a conversion cap that resets after a unit acts.

Teams

Recommended Teammates

HP hypercarry

Sunday advances Mydei and Tribbie amplifies his HP-scaled damage. Luocha heals through Mydei's attacks; maintain his Zone and reserve manual healing for dangerous HP-loss sequences.

MydeiCore character
Sunday
Tribbie
Luocha

HP shared core

Mydei and Castorice turn HP loss into their respective resources, with Hyacine restoring HP and raising Max HP. Cyrene adds damage support and a targeted Mydei or Castorice enhancement.

MydeiCore character
Hyacine
Cyrene
Castorice

Best Mydei Teams

2,311 observed teams36 recent contexts

Most Played With

Most Played Teams

#120.8%481 teams
- Mydei
- Tribbie
- Hyacine
- Cyrene
#215.0%347 teams
- Mydei
- Hyacine
- Cyrene
- Trailblazer (Remembrance)
#38.9%205 teams
- Mydei
- Hyacine
- Cyrene
- Robin • Summeretto
#45.8%135 teams
- Mydei
- Hyacine
- Cerydra
- Cyrene

Explore full Team Comp Finder

Skills

Basic ATK

Vow of Voyage

Single AttackLv. 6

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

Lv. 6

Skill

Deaths are Legion, Regrets are None

BlastLv. 10

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.

Skill sequence

Kingslayer Be King

BlastLv. 10

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.

Godslayer Be God

BlastLv. 10

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.

Lv. 10

Ultimate

Throne of Bones

BlastLv. 10

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.

Lv. 10

Talent

Blood for Blood

EnhanceLv. 10

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.

Lv. 10

Technique

Cage of Broken Lance

ImpairLv. 1

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.

Traces

Major Traces

Earth and Water

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.

Bloodied Chiton

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.

Minor Traces

CRIT DMG Boost+37.3%
HP Boost+18%
SPD Boost+5

Eidolons

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.

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.