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Mortenax Blade, Fire Nihility character | Honkai: Star Rail
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Stellaron Hunters

Mortenax Blade Build

Build guide · Honkai: Star Rail

5-star
FireNihilitySub DPS

English voice: Daman Mills

The best Mortenax Blade build in Honkai: Star Rail (Version 4.6) is Reforged in Hellfire with Divine-Querying Master Smith. Updated November 5, 2026

AbilitiesTracesMaterialsEidolons
Where these rankings come fromThe light cone order, relic sets and stat priorities on this tab are prydwen.gg’s, measured in play and rephrased. Relative damage figures are ratios against the bottom of each ranking, not absolute numbers, and each one holds only for the superimposition and team its row states. Everything else (base stats, passive text, material totals) is read from the game’s own data.

Light cones

Relics

Divine-Querying Master Smith, Cavern Relic set | Honkai: Star Rail
CoreDivine-Querying Master Smith

General best option for all Mortenax Blade's playstyle. This set is best for his personal damage and offers a team-wide 15% DMG boost.

2PCIncreases Max HP by 12%.

4PCIncreases the wearer's CRIT DMG dealt to enemy targets in the DEF reduction state by 28%. After the wearer inflicts the DEF reduction state on an enemy target, all allies gain "Comburent" for 2 turn(s). This effect cannot be stacked. The DMG dealt by ally targets with "Comburent" increases by 15%. This effect can be triggered again after the wearer uses an attack.

Planar ornaments

Sprightly Vonwacq, Planar Ornament set | Honkai: Star Rail
CoreSprightly Vonwacq

Provides him with some extra Energy Regeneration Rate, allows him to act first in combat to set up his Ultimate's Zone to begin accumulating Talent's Charges and applying debuffs to enemies.

2PCIncreases the wearer's Energy Regeneration Rate by 5%. When the wearer's SPD reaches 120 or higher, the wearer's action is Advanced Forward by 40% immediately upon entering battle.

Main stats

Body
CRIT Rate > Effect HIT Rate
Feet
Speed
Planar Sphere
HP% > Fire DMG
Link Rope
Energy Regen Rate > HP%

Substat priority

  1. 1CRIT Rate = CRIT DMGBest
  2. 2SPD
  3. 3HP%

Trace priority

  1. #1

    Ultimate

    Max first

  2. #2

    Skill = Talent

    Then

  3. #3

    Basic

    Next

Major traces, best first: Bone, Hardened ad Nauseam (A2) > Soul, Tempered ad Mortem (A4) > Heart, Refined ad Infinitum (A6)

Best Eidolons

  1. Mortenax Blade E1 Ere My Death, I Stood Unmade, Eidolon | Honkai: Star RailE1
  2. Mortenax Blade E2 Ash Was My Heart, Yet the Flame Stayed, Eidolon | Honkai: Star RailE2
  3. Mortenax Blade E3 Across the Shore, Wrath Laid Bare, Eidolon | Honkai: Star RailE3
  4. Mortenax Blade E4 Odium I've Smitten, Thence Came the Blade, Eidolon | Honkai: Star RailE4
  5. Mortenax Blade E5 I Severed My Woes, Knowing Death Begets Life, Eidolon | Honkai: Star RailE5
  6. Mortenax Blade E6 If Immortality Could Die, I Swore THEM Slain, Eidolon | Honkai: Star RailE6
  1. Mortenax Blade E1 Ere My Death, I Stood Unmade, Eidolon | Honkai: Star RailE1

    Ere My Death, I Stood Unmade

    Why it matters

    Provides a universal 20% All-Type RES reduction making this a great support Eidolon and also improves his Ultimate's Zone uptime through Countdown delay when he uses his extra Skill.

  2. Mortenax Blade E2 Ash Was My Heart, Yet the Flame Stayed, Eidolon | Honkai: Star RailE2

    Ash Was My Heart, Yet the Flame Stayed

    Why it matters

    Mortenax Blade's strongest Eidolon by far, making allies' Ultimates count as Follow-up attacks to open up new synergies such as with characters that buffs Follow-up attacks specifically like Ashveil, and more importantly reduces the required Charge for his extra Skill from 9 to 7 which can potentially let him chain much more Follow-up attacks and permanently maintain his Zone due to Eidolon 1's effect, while also buffing all allies' Follow-up attacks by a whopping 75% (applies to all Ultimates because of the first part of this Eidolon).

  3. Mortenax Blade E4 Odium I've Smitten, Thence Came the Blade, Eidolon | Honkai: Star RailE4

    Odium I've Smitten, Thence Came the Blade

    Why it matters

    Decent 50% DMG buff to all allies

  4. Mortenax Blade E6 If Immortality Could Die, I Swore THEM Slain, Eidolon | Honkai: Star RailE6

    If Immortality Could Die, I Swore THEM Slain

    Why it matters

    Accelerates his Follow-up attack frequency through extra Charges when Blade loses HP - can be through enemy attacks, using his Skill, or through teammates' HP drain, and increases his Ultimate DMG multipler by 1.5x altogether leading to a massive DPS increase.

Teams

Mortenax Blade team

Fire · NihilityLeads

He taunts, spends his own HP for a Zone that shreds DEF, and scales on Max HP: a carry that needs a healer more than it needs a second buffer.

  1. Mortenax Blade, Fire Nihility character | Honkai: Star RailMortenax Blade, this characterMain DPS
  2. The Dahlia, Fire Nihility character | Honkai: Star RailThe DahliaNihility partner
  3. Tribbie, Quantum Harmony character | Honkai: Star RailTribbieHarmony buffer
  4. Hyacine, Wind Remembrance character | Honkai: Star RailHyacineSustain

Aventurine • Waveflair team

Quantum · Elation dual carryPlays Off-turn attacker

The same "Fervor" engine fed by a Hunt carry and a Nihility unit whose off-turn hits count as attacks, with a Remembrance sustain whose memosprite keeps the counter moving between Waveflair's turns.

  1. Aventurine • Waveflair, Quantum Elation character | Honkai: Star RailAventurine • WaveflairMain DPS
  2. Ashveil, Lightning The Hunt character | Honkai: Star RailAshveilHunt carry
  3. Mortenax Blade, Fire Nihility character | Honkai: Star RailMortenax Blade, this characterOff-turn attacker
  4. Hyacine, Wind Remembrance character | Honkai: Star RailHyacineSustain

All teams, with every replacement

Honkai: Star Rail 5★ Fire Nihility Sub DPS

Mortenax Blade build summary

Updated November 5, 2026

Reforged in Hellfire tops the light cone ranking for Mortenax Blade at S1, ahead of Lies Dance on the Breeze, Before the Tutorial Mission Starts and Resolution Shines As Pearls of Sweat. That order is prydwen.gg's, measured in play and rephrased here; every row of it sits under Light cones below.

Run Divine-Querying Master Smith on Mortenax Blade, with Eagle of Twilight Line and Longevous Disciple behind it. The planar ornament is Sprightly Vonwacq. Main stats are CRIT Rate > Effect HIT Rate body, Speed feet, HP% > Fire DMG sphere, Energy Regen Rate > HP% rope. Roll substats in the order CRIT Rate = CRIT DMG > SPD > HP%.

Trace priority is Ultimate > Skill = Talent > Basic. The Ultimate costs 160 energy, which is what an Energy Regeneration Rate target has to clear.

The strongest team is Mortenax Blade, The Dahlia, Tribbie and Hyacine, built around Mortenax Blade: Fire · Nihility.

Role
Sub DPS / Support / Sustain
Best light cone
Reforged in Hellfire
Alternatives
Lies Dance on the Breeze, Before the Tutorial Mission Starts, Resolution Shines As Pearls of Sweat
Relic set
Divine-Querying Master Smith
Planar ornament
Sprightly Vonwacq
Main stats
CRIT Rate > Effect HIT Rate body, Speed feet, HP% > Fire DMG sphere, Energy Regen Rate > HP% rope
Substat priority
CRIT Rate = CRIT DMG > SPD > HP%
Trace priority
Ultimate > Skill = Talent > Basic
Best team
Mortenax Blade, The Dahlia, Tribbie, Hyacine
Ultimate energy cost
160 energy
Key ascension material
15× Lucid Awl
Last updated
November 5, 2026

Mortenax Blade build FAQ

What is the best Light Cone for Mortenax Blade?
Reforged in Hellfire is the closest fit on the data: it is a 5-star Nihility Light Cone with 423 base ATK at level 80, and its passive acts on HP. Boundless Choreo is the best 4-star alternative.
Which relic set should Mortenax Blade use?
Divine-Querying Master Smith. Its 2-piece bonus is: Increases Max HP by 12%. Its 4-piece bonus is: Increases the wearer's CRIT DMG dealt to enemy targets in the DEF reduction state by 28%. After the wearer inflicts the DEF reduction state on an enemy target, all allies gain "Comburent" for 2 turn(s). This effect cannot be stacked. The DMG dealt by ally targets with "Comburent" increases by 15%. This effect can be triggered again after the wearer uses an attack.
Which Planar Ornament should Mortenax Blade use?
Fleet of the Ageless. Its 2-piece bonus is: Increases the wearer's Max HP by 12%. When the wearer's SPD reaches 120 or higher, all allies' ATK increases by 8%. Planar Ornaments have no 4-piece bonus; the sphere and the rope are the whole set.
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