Stellaron Hunters
Build guide · Honkai: Star Rail
English voice: Daman Mills
The best Mortenax Blade build in Honkai: Star Rail (Version 4.4) is Reforged in Hellfire with Divine-Querying Master Smith. Updated August 28, 2026
Also works
#1
Ultimate
Max first
#2
Skill = Talent
Then
#3
Basic
Next
Major traces, best first: Bone, Hardened ad Nauseam (A2) > Soul, Tempered ad Mortem (A4) > Heart, Refined ad Infinitum (A6)
E1Ere My Death, I Stood Unmade
E2Ash Was My Heart, Yet the Flame Stayed
E3Level bump
E4Odium I've Smitten, Thence Came the Blade
E5Level bump
E6If Immortality Could Die, I Swore THEM SlainE1Provides 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.
E2Mortenax 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).
E4Decent 50% DMG buff to all allies
E6Accelerates 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.
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.
Mortenax Blade — this characterMain DPS
The DahliaNihility partner
TribbieHarmony buffer
HyacineSustainThe 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.
Aventurine • WaveflairMain DPS
AshveilHunt carryMortenax Blade — this characterOff-turn attackerHyacineSustainHonkai: Star Rail 5★ Fire Nihility Sub DPS
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.
Deals Fire DMG equal to 50% of Mortenax Blade's Max HP to one designated enemy, and causes the target to enter the Taunt state for 1 turn.
Ability level
6 is the cap from trace materials; Eidolons add the rest.
| Attribute | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Basic ATK DMG | 25% | 30% | 35% | 40% | 45% | 50% | 55% | 60% | 65% | 70% |
Deals Fire DMG equal to 100% of Mortenax Blade's Max HP to one designated enemy, and causes the target to enter the Taunt state for 1 turn.
Ability level
6 is the cap from trace materials; Eidolons add the rest.
| Attribute | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Basic ATK DMG | 50% | 60% | 70% | 80% | 90% | 100% | 110% | 120% | 130% | 140% |
Consumes HP equal to 10.0% of Mortenax Blade's Max HP and deals Fire DMG equal to 72% of Mortenax Blade's Max HP to all enemies, and additionally deals 4 instance(s) of DMG, with each instance dealing Fire DMG equal to 24.0% of Mortenax Blade's Max 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.
Ability level
10 is the cap from trace materials; Eidolons add the rest.
| Attribute | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AoE DMG | 36% | 40% | 43% | 47% | 50% | 54% | 59% | 63% | 68% | 72% | 76% | 79% | 83% | 86% | 90% |
| Skill DMG | 12.0% | 13.2% | 14.4% | 15.6% | 16.8% | 18.0% | 19.5% | 21.0% | 22.5% | 24.0% | 25.2% | 26.4% | 27.6% | 28.8% | 30.0% |
Inflicts "Balefire Bind" on all enemies. Enemy targets in the "Balefire Bind" state have their DEF reduced by 30.0% and the DMG they receive increases by 50.0%, lasting for 2 turn(s). Then, consumes HP equal to 20% of Mortenax Blade's Max 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 20%, increases CRIT DMG by 60.0%, 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 50% of this unit's Max HP. When gaining the "Infinite Fury" state, a corresponding countdown appears on the Action Order. The countdown has a fixed SPD of 70. At the start of the countdown's turn, dispels the Zone and exits the "Infinite Fury" state. If the current HP is insufficient, Mortenax Blade's current HP will be reduced to 1 when he uses this ability.
Ability level
10 is the cap from trace materials; Eidolons add the rest.
| Attribute | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ultimate DMG | 20.0% | 21.0% | 22.0% | 23.0% | 24.0% | 25.0% | 26.3% | 27.5% | 28.7% | 30.0% | 31.0% | 32.0% | 33.0% | 34.0% | 35.0% |
| Ultimate DMG (2) | 30.0% | 32.0% | 34.0% | 36.0% | 38.0% | 40.0% | 42.5% | 45.0% | 47.5% | 50.0% | 52.0% | 54.0% | 56.0% | 58.0% | 60.0% |
| Ultimate DMG (3) | 30.0% | 33.0% | 36.0% | 39.0% | 42.0% | 45.0% | 48.8% | 52.5% | 56.3% | 60.0% | 63.0% | 66.0% | 69.0% | 72.0% | 75.0% |
Deals Fire DMG equal to 350.0% of Mortenax Blade's Max HP to all enemies.
Ability level
10 is the cap from trace materials; Eidolons add the rest.
| Attribute | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AoE DMG | 210.0% | 224.0% | 238.0% | 252.0% | 266.0% | 280.0% | 297.5% | 315.0% | 332.5% | 350.0% | 364.0% | 378.0% | 392.0% | 406.0% | 420.0% |
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 9 points and the current HP is more than 1, consumes 9 Charge, regenerates 25.0 Energy, and enables Mortenax Blade to use Skill 1 extra time. This extra Skill use is considered as Follow-Up ATK.
Ability level
10 is the cap from trace materials; Eidolons add the rest.
| Attribute | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Energy Regenerated | 15.0 | 16.0 | 17.0 | 18.0 | 19.0 | 20.0 | 21.3 | 22.5 | 23.8 | 25.0 | 26.0 | 27.0 | 28.0 | 29.0 | 30.0 |
Immediately attacks all enemies within a certain range. After entering combat, inflicts the Taunt state on all enemies for 1 turn and decreases DMG taken by this unit by 90% for 2 turn(s).
A2Mortenax Blade can accumulate up to 80 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 75%, it is immediately regenerated to 75%. When Energy is regenerated to its maximum, dispels all debuffs from this unit.
A4While the Zone is active, increases the chance of being attacked by enemies, decreases DMG taken by this unit by 50%, and increases Incoming Healing by 50%. After being attacked, inflicts the "Balefire Bind" state on the corresponding target, and enables Mortenax Blade to gain 1 Charge.
A6While the Zone is active, ally targets deal 50% increased DMG. If there are other Nihility characters aside from Mortenax Blade in the team, Ultimate DMG dealt by ally targets increases by 75%. Otherwise, DMG dealt by Mortenax Blade additionally increases by 75%.
Totals at full unlock, summed across every node of that stat. Ascension rank gates the nodes as it gates the Bonus Abilities above.
Level 80 and every ability maxed
2,918,000
Credits 12 material lines
Ascension to 80
308,000
Credits 4 materials · 6 steps
All 4 abilities maxed
2,610,000
Credits 4× the single-ability bill
Whimsy Wax ×54,000Credits
Whimsy Wax ×108,000Credits
Radiant Prominence ×3
Dreamweave Steel ×616,000Credits
Radiant Prominence ×7Dreamweave Steel ×940,000Credits
Lucid Awl ×6Radiant Prominence ×2080,000Credits
Lucid Awl ×9Radiant Prominence ×35160,000Credits
Total to level 80
308,000 Credits
Lucid Awl ×15Radiant Prominence ×65Dreamweave Steel ×15Whimsy Wax ×15Whimsy Wax ×32,500Credits
Tear of Phagousa ×3Whimsy Wax ×65,000Credits
Dreamweave Steel ×3
Wine of Phagousa ×310,000Credits
Dreamweave Steel ×4Wine of Phagousa ×520,000Credits
Dreamweave Steel ×6Wine of Phagousa ×730,000Credits
Heart of Phagousa ×3Lucid Awl ×345,000Credits
Heart of Phagousa ×5Lucid Awl ×4
Vanquished Flow's Reticence ×180,000Credits
Tracks of Destiny ×1Heart of Phagousa ×8Vanquished Flow's Reticence ×1160,000Credits
Tracks of Destiny ×1Heart of Phagousa ×14Vanquished Flow's Reticence ×1300,000Credits
One ability maxed
652,500 Credits
Tracks of Destiny ×2Heart of Phagousa ×30Lucid Awl ×7Vanquished Flow's Reticence ×3Dreamweave Steel ×13Wine of Phagousa ×15Tear of Phagousa ×3Whimsy Wax ×9All 4 abilities maxed
2,610,000 Credits
Tracks of Destiny ×8Heart of Phagousa ×120Lucid Awl ×28Vanquished Flow's Reticence ×12Dreamweave Steel ×52Wine of Phagousa ×60Tear of Phagousa ×12Whimsy Wax ×36E1While the Zone is active, decreases all enemies' All-Type RES by 20%. After using the extra Skill from Talent, the "Infinite Fury" countdown has its action delayed by 15%.
E2When an ally character uses Ultimate to deal DMG, it is considered as having launched Follow-Up ATK. And the Follow-Up ATK DMG dealt by ally targets increases by 75%. The upper limit of Mortenax Blade's Charge decreases to 7.
E3Ultimate Lv. +2, up to a maximum of Lv. 15. Talent Lv. +2, up to a maximum of Lv. 15.
E4"Heart, Refined ad Infinitum" additionally increases ally targets' DMG dealt by 50%.
E5Skill Lv. +2, up to a maximum of Lv. 15. Basic ATK Lv. +1, up to a maximum of Lv. 10.
E6As the Zone persists, when Mortenax Blade takes DMG or consumes HP, he gains 1 Charge. This effect can trigger again after any target's turn ends. The DMG multiplier of "Tenax Per Ignem" increases to 150% of its original value.
Fire
Nihility
