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Mortenax Blade Honkai: Star Rail fighter artwork
Honkai: Star Rail Move & Ability Guide

Mortenax Blade moves, skills and special abilities

Move & Ability Guide

Mortenax Blade: 5-Star, Fire, Nihility. Faction: Stellaron Hunter — ???.

23 ability entries1 Skill2 Ultimates1 Talent3 Bonus Trace9 Stat Trace1 Basic Atk6 Eidolon

Skills

1
A Rain of Blades Seals Fate
Skill

Consumes HP equal to 20% of Mortenax Blade's maximum HP and inflicts Fire damage equal to 36% of Mortenax Blade's maximum HP to all enemies, and additionally inflicts 8 instance(s) of damage, with each instance dealing Fire damage equal to 12% of Mortenax Blade's maximum HP to one random enemy. If the current HP is insufficient, Mortenax Blade's current HP will be reduced to 1 when he uses Skill. While not in the "Infinite Fury" state or when the current HP is 1 or lower, Mortenax Blade cannot use his Skill. Using Skill does not consume Skill Points.

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.

Ultimates

2
Fornax Ex Corpore
Ultimate

Inflicts "Balefire Bind" on all enemies. Enemy targets in the "Balefire Bind" state have their DEF reduced by 20% and the damage they receive increases by 30% , lasting for 4 turn(s). Then, consumes HP equal to 40% of Mortenax Blade's maximum HP to deploy a Zone. While the Zone is active, Mortenax Blade enters the "Infinite Fury" state. During the "Infinite Fury" state, increases CRIT Rate by 40%, increases CRIT damage by 30% , enhances Basic ATK, unlocks Skill, and gains a new Ultimate "Tenax Per Ignem." When receiving a killing blow, this unit will not be knocked down, but will dispel the Zone, exit the "Infinite Fury" state, and restore HP equal to 100% of this unit's 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.
Bone, Hardened ad Nauseam
Ultimate

Mortenax Blade can accumulate up to 160 overflow Energy. After using Ultimate, clears it and regenerates a corresponding amount of Energy. When the battle starts or when the Zone is dispelled, if Energy is below 150%, it is immediately regenerated to 150%. When Energy is regenerated to its maximum, dispels all debuffs from this unit.

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
All Karma Comes Due
Talent

While the Zone is active, after each attack an ally target uses on an enemy, inflicts the "Balefire Bind" state on the corresponding enemy target and grants 1 Charge to Mortenax Blade. When Charge reaches 18 points and the current HP is more than 1, consumes 18 Charge, regenerates 15 Energy, and enables Mortenax Blade to use Skill 1 extra time. This extra Skill use is considered as Follow-Up ATK.

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

3
Heart, Refined ad Infinitum
Bonus Trace

While the Zone is active, ally targets deal 100% increased damage. If there are other Nihility characters aside from Mortenax Blade in the team, Ultimate damage dealt by ally targets increases by 150%. Otherwise, damage dealt by Mortenax Blade additionally increases by 150%.

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.
Soul, Tempered ad Mortem
Bonus Trace

While the Zone is active, increases the chance of being attacked by enemies, decreases damage taken by this unit by 100%, and increases Incoming Healing by 100%. After being attacked, inflicts the "Balefire Bind" state on the corresponding target, and enables Mortenax Blade to gain 1 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.
Blade's Reach Spares None
Bonus Trace

Immediately attacks all enemies within a certain range. After entering combat, inflicts the Taunt state on all enemies for 1 turn and decreases damage taken by this unit by 180% for 4 turn(s).

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

9
CRIT Rate Boost
Stat Trace

CRIT Rate 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.
HP Boost
Stat Trace

maximum HP increases by 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.
DMG Boost: Fire
Stat Trace

Fire damage increases by 4.8%

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 Rate Boost
Stat Trace

CRIT Rate increases by 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.
DMG Boost: Fire
Stat Trace

Fire damage increases by 4.8%

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.
DMG Boost: Fire
Stat Trace

Fire damage increases by 6.4%

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.
CRIT Rate Boost
Stat Trace

CRIT Rate increases by 2.7%

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.
DMG Boost: Fire
Stat Trace

Fire damage increases by 3.2%

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.
HP Boost
Stat Trace

maximum HP increases by 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.

Basic Atk

1
A Broken Blade Still Slays
Basic ATK

Inflicts Fire damage equal to 25% of Mortenax Blade's maximum HP to one designated enemy, and causes the target to enter the Taunt state for 1 turn. A Tempered Blade Severs Souls Inflicts Fire damage equal to 50 % of Mortenax Blade's maximum HP to one designated enemy, and causes the target to enter the Taunt state for 1 turn.

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
Ere My Death, I Stood Unmade
Eidolon

While the Zone is active, decreases all enemies' All-Type RES by 40%. After using the extra Skill from Talent, the "Infinite Fury" countdown has its action delayed by 30%.

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.
Ash Was My Heart, Yet the Flame Stayed
Eidolon

When an ally character uses Ultimate to deal damage, it is considered as having launched Follow-Up ATK. And the Follow-Up ATK damage dealt by ally targets increases by 150%. The upper limit of Mortenax Blade's Charge decreases to 14.

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.
Across the Shore, Wrath Laid Bare
Eidolon

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

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.
Odium I've Smitten, Thence Came the Blade
Eidolon

"Heart, Refined ad Infinitum" additionally increases ally targets' damage dealt by 100%.

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.
I Severed My Woes, Knowing Death Begets Life
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 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.
If Immortality Could Die, I Swore THEM Slain
Eidolon

As the Zone persists, when Mortenax Blade takes damage or consumes HP, he gains 1 Charge. This effect can trigger again after any target's turn ends. The damage multiplier of "Tenax Per Ignem" increases to 300% of its original value.

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.