Honkai Star Rail Mortenax Blade Build: Support, DPS and Teams

Mortenax Blade is not built from one universal sheet. His Acheron support build values early Energy, Speed, and reliable Zone timing; his hybrid build balances those requirements with HP and CRIT; a personal-DPS build moves further into HP and offensive stats only after the Zone is already stable. The best starting point is 4-piece Divine-Querying Master Smith, CRIT Rate body, Speed boots, HP sphere, Energy Regeneration Rate rope, and either Sprightly Vonwacq or Bone Collection’s Serene Demesne.

Choose Your Mortenax Blade Build First

The support lane is for Acheron teams that need the Zone and repeated debuffs as early as possible. The hybrid lane is the best general recommendation because his personal damage is meaningful even when he occupies a support slot. The main-DPS lane is an account-specific choice; it sacrifices some consistency and should only be used when the team supplies enough Energy, action control, and amplification.

Mortenax Blade Skills and Trace Priority

Icon	Trace	Type	Priority
	Fornax Ex Corpore	Basic ATK	Level after core traces
	All Karma Comes Due	Skill	Starts the damage and Charge loop
	A Rain of Blades Seals Fate	Ultimate	Deploys the Zone and Balefire Bind
	Blade's Reach Spares None	Talent	Core Zone and extra-action value

How the Zone, Balefire Bind and Charge Work

His Ultimate applies Balefire Bind, reducing enemy DEF and increasing damage received, then consumes HP to deploy a Zone and enter Infinite Fury. During the Zone, allied attacks refresh Balefire Bind and generate Charge. At 18 Charge, Mortenax Blade restores Energy and gains an extra Skill use that counts as a follow-up attack. The loop rewards teams that attack frequently rather than teams that wait for one slow burst.

Use the enhanced Ultimate before the countdown removes the Zone. If you hold it too long, you lose both damage and team amplification. His kit also increases aggro and sharply reduces incoming damage during the Zone, so enemy turns become part of his Charge and debuff engine.

Best Relics, Planars and Stat Targets

Use Divine-Querying Master Smith for all three roles. Vonwacq is the clean support planar because it gives Energy Regeneration and opening action advance. Bone Collection is better when the opener already works and you want HP plus CRIT DMG. Target 6,000+ HP, close to 100% CRIT Rate in combat, 130%+ CRIT DMG, and one deliberate Speed tier: 134 for general play, 160 for fast support, or 170 only when a specific Light Cone requires it.

Effect Hit Rate is conditional. Standard signature and CRIT builds do not need a large EHR investment. Raise it only when Resolution or Lies Dance needs application accuracy. ATK% is a weak roll because his important damage scales from Max HP.

Best Mortenax Blade Light Cones by Role

Icon	Light Cone	Use	Why
	Reforged in Hellfire	Best overall	HP, opening Energy, and smoother Zone setup
	Before the Tutorial Mission Starts	Accessible support	Energy recovery when DEF reduction is active
	Resolution Shines As Pearls of Sweat	Debuff support	Extra DEF reduction when Effect Hit Rate is sufficient

• Reforged in Hellfire: best overall for HP, opening Energy, and smooth Zone setup.
• Lies Dance on the Breeze: specialized fast-support choice; only worth the heavy Speed/EHR requirement when the rotation uses it.
• Before the Tutorial Mission Starts: best accessible Energy option when DEF reduction is active before he attacks.
• Resolution Shines As Pearls of Sweat: support option when its DEF reduction is not overcapped and EHR is sufficient.
• Holiday Thermae Escapade: balanced long-term Battle Pass alternative.

Mortenax Blade Teams and Acheron Synergy

Team	Lineup	Why it works
Acheron safe shell	AcheronMortenax BladeJiaoqiuorPelasustain	Preserves Nihility and adds frequent debuffs
Frequent attackers	AshveilMortenax BladeTribbieDan Heng PT	Builds Charge quickly
Elation flex	EvanesciaElation TrailblazerYao GuangMortenax Blade	High amplification, low safety
HP team	CastoriceMortenax BladeTribbieHyacine	HP movement supports both kits

For E0 Acheron, check whether the second Nihility slot is needed to preserve her full Trace multiplier. Mortenax Blade is valuable because he supplies frequent debuffs, DEF reduction, damage-taken amplification, and Ultimate support at the same time. In non-Acheron teams, pair him with frequent attackers who can fill Charge quickly.

Rotation for Reliable First-Turn Zone

1. Use DEF reduction first if Tutorial or Resolution needs it.
2. Act with Mortenax Blade early, preferably through Speed or Vonwacq.
3. Deploy the Zone before the main burst window.
4. Let frequent allied attacks build Charge and trigger extra Skill uses.
5. Use Tenax Per Ignem before the countdown ends.

Trace Priority, Materials and Farming

Prioritize Ultimate, Talent, and the major Zone-related traces, followed by Skill and Basic ATK. Level Mortenax Blade and his Light Cone before optimizing relic substats, and pin him in the in-game material tracker so every farming run matches your client language.

Pull Value: E0, S1 or E1?

E0 is complete and is the right stop for most players. S1 is the comfort upgrade when first-turn Zone consistency and easier gearing are the goal. E1 is attractive if you already own a strong alternative Light Cone and want deeper RES reduction and Zone value. Accounts without a compatible carry or reliable sustain should solve those gaps before vertical investment.

Plan your Honkai: Star Rail pullsChoose the build and stopping point before buying Oneiric Shards.

Check HSR top-up

Mortenax Blade Build Mistakes

• Building 67% EHR without checking the actual Light Cone and enemy resistance.
• Forcing 170 Speed on a build that does not use Lies Dance.
• Using an HP rope before confirming Zone uptime.
• Overcapping CRIT Rate after Infinite Fury’s bonus.
• Holding the enhanced Ultimate until the Zone expires.

Mortenax Blade Build FAQ

More Honkai Star Rail Guides

Mortenax Blade Build Summary

Build Mortenax Blade for the job the team needs. Support and hybrid setups should establish the Zone first; personal damage only becomes the priority after Energy, Speed, and debuff timing are reliable.