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Mortenax Blade is a 5-star Fire unit on the Path of The Nihility, but instead of standard damage-over-time, he plays like a high-risk, high-reward bruiser. His entire kit revolves around burning his own HP to deal massive AoE damage that scales directly off his Max HP. Once he pops his burst, this carry drops a zone that shreds enemy defense and amplifies the damage they take. Because his main attacks cost zero Skill Points (SP), he slots in perfectly as a selfish hyper-carry or a crazy efficient sub-DPS for players who love living on the edge.
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Disclaimer: All data, stats, and mechanics mentioned in this guide are sourced from the beta test server and are subject to change upon official release.
How Do Mortenax Blade's Skills Work?
His kit is completely fueled by his health bar. Your main goal is managing his Infinite Fury stance to squeeze out every drop of DPS.
- Basic Attack (A Broken Blade Still Slays): Deals minor Fire damage scaling off his Max HP and Taunts for 1 turn. Handy in a pinch.
- Skill (A Rain of Blades Seals Fate): His bread and butter. Eats 15% of his Max HP to deal heavy AoE Fire damage, plus 4 random bounces. The kicker? It costs zero Skill Points.
- Ultimate (Fornax Ex Corpore): Slaps Balefire Bind on the whole enemy team (reducing DEF by 30% and increasing DMG taken by 50%). He then chunks 30% of his own HP to drop a Zone and enter the Infinite Fury stance.
- Infinite Fury State: While this is active, he gets a free +20% CRIT Rate and +60% CRIT DMG. His Ultimate turns into a massive nuke called Tenax Per Ignem. If he takes a fatal hit here, he doesn't die—he just cancels the stance and heals for 50% of his Max HP. It's a built-in cheat death.
- Talent (All Karma Comes Due): While the Zone is up, every ally attack inflicts Balefire Bind and gives him 1 Charge. Hit 9 Charges, and he gets Energy back plus a free, follow-up version of his Skill that doesn't drain his health.
Best Combat Rotation:
- Set up your supports' buffs first.
- Drop his Ultimate right away to get the Zone up and apply that juicy Balefire Bind debuff.
- Spam his Skill for 0 SP while he is riding the Infinite Fury buffs.
- Let your fast teammates attack to quickly stack his Talent Charges for those free follow-up attacks.
- Cash in the enhanced nuke ultimate (Tenax Per Ignem) right before the stance times out.
What is the Best Weapon for Mortenax Blade?
You have to be careful picking a Light Cone here. This unit scales entirely on HP, so standard ATK% stat sticks are totally useless.
- Best-in-Slot (BiS): Reforged in Hellfire
His signature weapon is practically mandatory if you want to min-max. It gives a flat 24% Max HP and batteries 20 Energy at the start of every wave. Even better, using a Skill applies Purgatory, making enemies take 30% more CRIT DMG (plus an extra 30% from the wearer). It synergizes flawlessly with his innate CRIT buffs. - Budget / F2P Option: Lies Dance on the Breeze
Skipping the weapon banner? This 5-star alternative works well. You get a massive 18% SPD boost and a high chance to inflict Bamboozle, shredding 16% DEF. Push his SPD to 170+, and you get an extra 8% DEF shred on top. This stacks perfectly with his own kit's debuffs.
Which Gear and Stats Maximize Mortenax Blade's Damage?
To get this carry hitting like a truck, you need artifacts that heavily buff his health pool and crits.
Recommended Artifact Sets:
- Cavern Relic: Go with the 4-piece Divine-Querying Master Smith. The 2-piece is a nice +12% Max HP, but the 4-piece is where the magic happens: 28% CRIT DMG against DEF-reduced enemies (which he applies naturally). Plus, it gives the whole squad a 15% DMG buff.
- Planar Ornament: 2-piece Bone Collection's Serene Demesne. Gives another +12% Max HP, and once he breaks the 5,000 HP threshold, you get a permanent 28% CRIT DMG buff.
Main and Sub-Stat Priorities:
- Body: CRIT Rate or CRIT DMG (balance this around your weapon stats)
- Boots: SPD (You want him taking as many turns as possible during his burst window)
- Sphere: Fire DMG Boost or HP%
- Rope: HP%
- Sub-stats to target: HP% > CRIT Rate / CRIT DMG > SPD. (Again, ignore ATK% completely).
What Are the Best Team Comps for Mortenax Blade?
Since he is always bleeding out and needs allies to build his Talent charges, you want fast attackers and beefy HP buffers.
- Team 1: Ashveil + Mortenax Blade + Tribbie + Hyacine
This is his dream setup. Hyacine (Wind healer) boosts the team's Max HP by 30% + 600 flat HP. Tribbie (Harmony) buffs his Max HP even more based on total team health and gives crazy RES PEN. Ashveil (Hunt) attacks constantly with follow-ups, rapidly stacking charges for the Fire DPS's Talent so he can spam AoE nukes. - Team 2: Acheron + Mortenax Blade + Jiaoqiu + Hyacine
Because this guy applies Balefire Bind automatically via his Zone and costs 0 SP, he is an insane sub-DPS for Acheron. Every debuff he or Jiaoqiu lands feeds Acheron's Ultimate gauge. You still absolutely need Hyacine here to keep everyone alive, since the Nihility teammates are squishy and Mortenax is actively draining his own life.
(Side note: Leaks point to an upcoming version 4.4 character who might slot in perfectly here, so keep your eyes peeled.)
What Materials Are Needed to Upgrade Mortenax Blade?
Time to hit the grind. If you want to max out this Fire carry alongside his signature weapon (Reforged in Hellfire), here is your exact shopping list. Save up your pennies, because taking his Traces to the limit will drain your account fast.
| Material Name | Character Ascension (Lv. 80) | Skills & Traces (Max) | Signature Weapon (Lv. 80) |
|---|---|---|---|
| Credits | 308,000 | 2,197,500 | 385,000 |
| Radiant Prominence | 65 | - | - |
| Whimsy Wax | 15 | 33 | 20 |
| Dreamweave Steel | 15 | 46 | 20 |
| Lucid Awl | 15 | 28 | 14 |
| Tear of Phagousa | - | 12 | 4 |
| Wine of Phagousa | - | 53 | 12 |
| Heart of Phagousa | - | 101 | 15 |
| Tracks of Destiny | - | 6 | - |
| Weekly Boss Drop | - | 9 | - |
(Note: The exact name of the weekly boss material is currently unknown and will be updated later.)
Which Constellations (Awakenings) Are Worth Getting?
Going for dupes? Here’s how his Eidolons stack up.
| Level | Effect | Value/Verdict |
|---|---|---|
| E1 | Zone decreases all enemies' All-Type RES by 20%. Talent skill delays the stance countdown by 15%. | High. The extra RES shred is huge, and delaying his stance timeout gives you more time to spam 0-SP skills. Great stopping point. |
| E2 | Talent skill DMG +50%. Ally Ultimates count as Follow-Up attacks. Ally Follow-Ups give him Charge. | Very High. Completely breaks his rotation in the best way possible. With fast teammates, he will fire off his talent constantly. Best value stopping point. |
| E3 | Ultimate +2, Talent +2. | Moderate. Standard damage scaling bump. |
| E4 | His Bonus Ability gives allies an extra 50% DMG dealt. | High. Turns him into a god-tier sub-DPS and support for dual-carry teams. |
| E5 | Skill +2, Basic +1. | Moderate. Nice bump to his main spammable attack. |
| E6 | Taking DMG/consuming HP gives Charge. Stance Nuke multiplier increases to 150%. | Overpowered. Every time he hits himself, he charges his own follow-up. The damage ceiling here is just ridiculous. |
Is Mortenax Blade Worth Pulling?
Yes. 100%. He is easily one of the most self-sufficient and versatile damage dealers we've seen.
- Pros: He uses zero Skill Points during his main burst, buffs his own CRIT stats to the moon, shreds team-wide DEF/Vulnerability, and literally has a cheat death mechanic if you mess up a rotation.
- Cons: He is squishy by design because he is always hovering near 1 HP. You absolutely cannot run him without a top-tier healer (like Hyacine) to keep him functioning.
If you’ve got a premium healer ready to go and need a Fire carry who won't fight your supports for Skill Points, pull him. You won't regret it. If you need some extra resources to secure his pull, don't forget to grab the latest Honkai Star Rail codes for free Stellar Jades.
Frequently Asked Questions (FAQ)
Why does this character feel so squishy in endgame content?
Because his kit actively drains 15% to 30% of his health per rotation, this Fire carry spends half the fight on life support. To fix his squishiness, you have to pair him with a high-output, sustained healer. Don't bother with shielders; he needs raw HP regeneration to keep fueling his damage skills.
Should I slap some ATK% relics on him to boost his ultimate damage?
Absolutely not. Literally every damage multiplier in his kit scales off his Max HP. Any ATK% on your gear is a dead stat. Double down on HP%, SPD, and CRIT to maximize his damage output and ensure he doesn't accidentally one-shot himself.
Do I need an Energy Regeneration Rate (ERR) rope to keep his burst up?
Actually, no. Even though his rotation relies heavily on his burst window, he has fantastic built-in energy management. His Bonus Ability automatically bumps his energy to 50% if it drops too low when his stance ends. Plus, hitting 9 Talent charges refunds 25 Energy. Stick to an HP% Rope to push his damage ceiling higher.
What happens if he takes fatal damage during his Infinite Fury stance?
This is where his kit gets crazy. If an enemy lands a killing blow while his Zone is active, he will not die. Instead, his built-in cheat death triggers. He instantly dispels the Zone, exits his stance early, and heals for 50% of his Max HP. It gives you a massive safety net if you miscalculate his health drain.
Apr 15, 2026
Honkai: Star Rail (HSR)
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