HSR 4.3 Mortenax Blade Ascension & Trace Materials List

Harness the hellfire with Mortenax Blade, the new 5-star Fire Nihility character in Honkai Star Rail 4.3! Our complete build guide covers his high-risk HP-consumption kit, the devastating "Infinite Fury" state, and the best team comps featuring Ashveil and Acheron. Master his dual-form support/DPS playstyle and optimize your Relics today.

🔥 Hellfire Reborn: Honkai Star Rail Mortenax Blade Build & Meta Guide 🗡️

If your gameplay philosophy is “lose HP, gain damage, repeat,” then Mortenax Blade fits perfectly into your roster. Arriving in Version 4.3, this Fire Nihility powerhouse often called SP Blade or Nihilux Blade reinterprets the Stellaron Hunter's classic high-risk style into a sophisticated dual-form kit. Mortenax Blade acts as a premier universal support before transcending into a terrifying AoE Main DPS during his "Infinite Fury" window.

This guide breaks down his "Infinite Fury" mechanics, essential materials, and the best equipment to ensure you dominate the battlefield without speedrunning your own defeat.

⚔️ Combat Mechanics: The Dual-Form Nihilist

Mortenax Blade shifts between a Support Zone and a Main DPS State based on his Ultimate usage.

Zone Support: Before his transformation, he reduces enemy DEF by 30% and increases the DMG they take by 50%. His "Balefire Bind" debuff makes him a top-tier amplifier for Nihility and Follow-up teams.
Infinite Fury (Main DPS): Activating his Ultimate, Fornax Ex Corpore, consumes 30% of his Max HP to deploy a Zone. He gains 20% CRIT Rate and 60% CRIT DMG, gaining access to the high-scaling Tenax Per Ignem ultimate.
HP Scaling: Every part of his kit scales with Max HP, meaning you can build him as a "tanky" damage dealer who thrives on the edge of death.

⚙️ Best Light Cones & Gear

Mortenax Blade’s signature weapon is a significant power spike, but there are strong alternatives for F2P players.

Light Cone Tier Key Effects Reforged in Hellfire S+ (BiS) Increases Max HP by 24% and inflicts "Purgatory," boosting CRIT DMG taken by enemies. Lies Dance on the Breeze S (Alternative) Massive SPD boost and up to 24% DEF reduction on enemies. Before Tutorial Mission A (F2P) Increases Effect Hit Rate and regenerates Energy when attacking DEF-reduced foes.

🖼️ Recommended Relics & Stat Priority

Since he scales with Max HP and rewards debuffing, his relic selection is quite specific.

Best Relic Sets:

4-Pc Divine-Querying Master Smith: The definitive choice. It buffs Max HP and grants a team-wide DMG boost whenever Mortenax inflicts DEF reduction.
4-Pc Pioneer Diver of Dead Waters: A strong offensive alternative that capitalizes on his high debuff frequency to boost CRIT stats.

Best Planar Ornaments:

2-Pc Bone Collection's Serene Demesne: Perfect synergy. It buffs Max HP and grants extra CRIT DMG once you cross the 5,000 HP threshold.

Stat Priority:

Body: CRIT DMG
Feet: SPD
Sphere: Fire DMG Boost
Rope: HP%

Sub-stats: HP% > CRIT Rate > CRIT DMG > SPD

👥 Top Tier Team Compositions

Mortenax Blade is incredibly versatile, fitting into both dedicated Nihility "DoT" teams and Follow-up Attack (FUA) cores.

The "Burning Sky" Comp: Mortenax Blade + Ashveil + Tribbie + Dan Heng • PT. (Focuses on high-frequency follow-up triggers and massive zone buffs).
The Nihility Nuke: Mortenax Blade + Acheron + Sparkle + Cyrene. (Provides the debuff stacks Acheron needs while acting as a secondary carry).
The Remembrance Synergy: Mortenax Blade + Cyrene + Sunday + Hyacine.

🛠️ Mortenax Blade Materials

Don't be caught unprepared! Start farming these materials early to max out your SP Blade on day one.

Ascension: Credits (308k), Radiant Prominence (65), Whimsy Wax (15), Dreamweave Steel (15), Lucid Awl (15).
Traces (Nihility): Obsidian Series (Dread, Desolation, Obsession), Tear/Wine/Heart of Phagousa.

💎 Master the 4.3 Meta

Mortenax Blade anchors the early progression of Version 4.3, representing a new tier of "Support-Carry" hybrids equivalent to Ruan Mei or Sparkle. Travelers aiming to maximize their pulling power can explore trusted Honkai Star Rail Accounts, optimize their relic grind with expert Honkai Star Rail Hourly Services, or secure a full clear of the latest Memory of Chaos stages through reliable Honkai Star Rail Boosting as the Fire-Nihility meta heats up.

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