Mortenax Blade build
Mortenax Blade
Mortenax Blade turns enemy and ally actions into a nearly continuous field of DEF reduction, vulnerability and HP-scaled Follow-Up damage.
Fire
Nihility- Role
- Fire HP-scaling Nihility debuffer and Follow-Up sub-DPS
- Version
- 4.4
- Reviewed on
- August 12, 2026
Recommended build
Light Cone
Reforged in HellfireReforged in Hellfire is the unique general best: 30% Max HP raises every damaging multiplier, the opening Energy accelerates the Zone, and Purgatory amplifies team and personal CRIT DMG taken.
When to use it : Use the Skill during Infinite Fury to place Purgatory for two turns; the fixed 20 Energy is granted only once per wave.
Before the Tutorial Mission StartsBefore the Tutorial Mission Starts S5 supplies 40% Effect Hit Rate and regenerates 8 Energy whenever Mortenax Blade attacks an enemy whose DEF he has reduced, favoring Zone uptime over signature-only HP and CRIT amplification.
It is permanently redeemable and superimposable through Herta's Store, so it needs no limited Light Cone Warp.
Boundless ChoreoBoundless Choreo adds CRIT Rate and raises CRIT DMG against Slowed or DEF-reduced targets.
When to use it : Use only when the team reliably Slows enemies or reduces their DEF.
Relics
Divine-Querying Master Smith adds Max HP, 28% CRIT DMG against DEF-reduced targets and a refreshable 15% team DMG buff, matching both halves of Mortenax Blade's role.
When to use it : Cast the Ultimate before the damage window and keep attacking so Balefire Bind repeatedly satisfies the DEF-reduction trigger and refreshes Comburent.
Two-piece Longevous Disciple plus two-piece Scholar Lost in Erudition is a transition mix: Increases Max HP by 12%. Increases CRIT Rate by 8%.
It reuses strong pieces from two sets while a complete four-piece configuration with equivalent main stats and substats is still being farmed.
Planar Ornaments
Bone Collection's Serene Demesne is the strongest general personal-damage ornament because both of its stats scale Mortenax Blade's HP-based attacks.
When to use it : Reach 5,000 Max HP before combat effects so both the 12% Max HP and 28% CRIT DMG portions remain active.
Inert Salsotto is a ranked alternative with this two-piece effect: Increases the wearer's CRIT Rate by 8%. When the wearer's current CRIT Rate reaches 50% or higher, the DMG dealt by the wearer's Ultimate and Follow-Up ATK increases by 15%.
When to use it : Reach 50% CRIT Rate to activate the Ultimate and Follow-Up ATK bonus.
Team lineup
Acheron converts Mortenax Blade and Jiaoqiu's dense debuff stream into Slashed Dream, while Aventurine sustains the group and adds attacks without competing for Skill Points.
When to use it : Place Mortenax Blade's Zone before Acheron's Ultimate, maintain Jiaoqiu's Ashen Roast and let Aventurine's frequent Follow-Up attacks accelerate the 9-Charge loop.
Trace priority
- Ultimate
- Skill
- Talent
- Basic ATK
Mortenax Blade spends HP to maintain Infinite Fury, holds a universal damage Zone and repeatedly reapplies Balefire Bind while ally attacks charge a free Follow-Up Skill.
How to play it
- 1Open with Technique or a taunting Basic, let Bone, Hardened ad Nauseam raise Energy to 75% if needed, then cast Fornax Ex Corpore before the team's main damage window.
- 2During Infinite Fury, every allied attack grants one Charge; at 9 Charge, the Talent spends the stack, restores 30 Energy and launches one Skill as a Follow-Up ATK without consuming a Skill Point.
- 3Keep Balefire Bind's 35% DEF reduction and 60% DMG taken increase active. Preserve enough Energy to recast the base Ultimate when the fixed-70-SPD countdown removes the Zone instead of spending Tenax Per Ignem at the cost of uptime.
Sources and methodology
Editorial recommendations are written from released game data, then cross-checked against specialist calculations. They are not copied from a single tier list.
Review method
Prydwen and Icy Veins were read independently after Mortenax Blade's Version 4.3 release, then checked against the exact local 4.4 snapshot. The maxed E0 Trace-level-15 model treats every allied attack as one Charge event, spends exactly 9 Charge for the 30-Energy Follow-Up Skill, and keeps the fixed-70-SPD Zone countdown distinct from Mortenax Blade's sheet SPD. It applies the released 35% DEF reduction and 60% vulnerability for two turns, caps his own CRIT at 100% after the Ultimate's 20%, and keeps the maxed 75% CRIT DMG bonus outside sheet targets. Effect Hit Rate is not assigned unless a selected cone needs it. Official 4.3 notes and the immutable 4.0-to-4.4 delta establish the release baseline and subsequent catalog state.
- Prydwen — direct released mortenax-blade build analysisChecked 2026-08-12
- Icy Veins — independent released mortenax-blade build analysisChecked 2026-08-12
- TurnBasedGameData — Version 4.4 exact snapshotChecked 2026-08-12
- TurnBasedGameData — released Version 4.0 to 4.4 deltaChecked 2026-08-12
- HoYoLAB — Version 4.3 update detailsChecked 2026-08-12
Independent E0 recommendations. The 80% sheet CRIT Rate ceiling assumes the Ultimate's own 20% and stops at 100% effective; Effect Hit Rate is listed only when the equipped cone requires it.