Mydei Honkai: Star Rail fighter artwork
Honkai: Star Rail Move & Ability Guide

Mydei moves, skills and special abilities

Move & Ability Guide

Mydei: 5-Star, Imaginary, The Destruction. Faction: Amphoreus (Location).

24 ability entries1 Ultimate1 Talent4 Bonus Trace10 Stat Trace1 Technique1 Basic Atk6 Eidolon

Ultimates

1
Throne of Bones
Ultimate

Toughness Break: 20 Recovers HP by 15% of Mydei's maximum HP and accumulates 20 Talent's Charge point(s). Inflicts Imaginary damage equal to 96% of Mydei's maximum HP to one designated enemy, and inflicts Imaginary damage equal to 60% of Mydei's maximum 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.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Talent

1
Blood for Blood
Talent

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, recovers HP equal to 15% of Mydei's maximum HP, and advances action by 100%. While the "Vendetta" state is active, maximum HP increases by 50% of the current maximum 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 recovers HP by 50% of his maximum HP.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Bonus Trace

4
Bloodied Chiton
Bonus Trace

When battle starts, if Mydei's maximum HP exceeds 4000, for every 100 excess HP, Mydei's CRIT Rate increases by 1.2%, his Charge ratio from enemy targets' damage 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.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Deaths are Legion, Regrets are None
Bonus Trace

Consumes HP by an amount equal to 50% of Mydei's current HP. Inflicts Imaginary damage equal to 45% of Mydei's maximum HP to one designated enemy and Imaginary damage equal to 25% of Mydei's maximum HP to adjacent targets. If the current HP is not sufficient, using Skill reduces Mydei's current HP to 1. Kingslayer Be King Toughness Break: 15 Consumes HP by an amount equal to 35% of Mydei's current HP. Inflicts Imaginary damage equal to 55% of Mydei's maximum HP to one enemy and Imaginary damage equal to 33% of Mydei's maximum HP to adjacent targets. If the current HP is not sufficient, using Skill reduces Mydei's current HP to 1.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Thirty Tyrants
Bonus Trace

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

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Earth and Water
Bonus Trace

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.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Stat Trace

10
SPD Boost
Stat Trace

SPD increases by 3

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
CRIT DMG Boost
Stat Trace

CRIT damage increases by 10.7%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
HP Boost
Stat Trace

maximum HP increases by 8.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
CRIT DMG Boost
Stat Trace

CRIT damage increases by 5.3%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
CRIT DMG Boost
Stat Trace

CRIT damage increases by 8.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
HP Boost
Stat Trace

maximum HP increases by 6.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
CRIT DMG Boost
Stat Trace

CRIT damage increases by 8.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
HP Boost
Stat Trace

maximum HP increases by 4.0%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
CRIT DMG Boost
Stat Trace

CRIT damage increases by 5.3%

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
SPD Boost
Stat Trace

SPD increases by 2

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Technique

1
Cage of Broken Lance
Technique

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, inflicts Imaginary damage equal to 80% of Mydei's maximum HP to all enemies, and Taunts the targets, lasting for 1 turn(s). This unit accumulates 50 point(s) of Talent's Charge.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Basic Atk

1
Vow of Voyage
Basic ATK

Toughness Break: 10 Inflicts Imaginary damage equal to 25% of Mydei's maximum HP to one designated enemy.

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.

Eidolon

6
Frost Hones Spine of Steel
Eidolon

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

Requirements / unlock: Eidolon 1

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Strife Beholds Cry of Dead
Eidolon

During "Vendetta," the damage 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.

Requirements / unlock: Eidolon 2

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Honor Exalts Feast of Faith
Eidolon

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

Requirements / unlock: Eidolon 3

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Siren Jolts the Laconic Lion
Eidolon

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

Requirements / unlock: Eidolon 4

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
War Chisels Flesh of Flame
Eidolon

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

Requirements / unlock: Eidolon 5

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.
Legacy Scales Mound of Blood
Eidolon

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

Requirements / unlock: Eidolon 6

Source details & verification
HoYoWiki mechanics reference (community-editable), reviewed October 29, 2026. This is a concise mechanics index; the source contains full conditions and level-dependent scaling. Not independently tested in-game.