Mortenax Blade Build Guide (HSR 4.3) — Charge Loop + E0 Optimization: Best Relics, Light Cones & Teams

Mortenax Blade Isn’t a Normal Nihility Character

When Mortenax Blade was first revealed, most players expected a standard Nihility debuffer built mainly for Acheron teams.

Post-launch testing quickly changed that narrative.

He has emerged as one of the most versatile units in the entire 4.x cycle, functioning as:

Debuffer
Sub-DPS
Follow-Up Attack enabler
Acheron support
Team-wide damage amplifier
Energy engine

Most importantly, he delivers this full kit without requiring heavy investment.

At E0, Mortenax Blade already performs at a near-complete level — something rare for modern high-impact units.

While many hypercarries rely on Eidolons or signature Light Cones to reach full potential, he provides immediate, usable value straight from unlock.

This flexibility is why theorycrafters now refer to him as an “Account Glue Unit.”

Instead of supporting a single archetype, he strengthens multiple teams at once through:

Universal damage amplification
Consistent debuff application
Follow-Up synergy scaling
HP-based damage contribution

If you’ve already pulled him—or are planning to—this guide breaks down his best relics, Light Cones, teams, stat priorities, and E0 optimization based on current community testing.

TL;DR — Best Mortenax Blade Build

Quick Build Recommendation

Relic Set

Divine-Querying Master Smith (4-Piece)

Planar Ornament

Bone Collection

Main Stats

Slot	Main Stat
Body	Crit Rate
Boots	SPD
Sphere	HP%
Rope	Energy Regeneration Rate

Best Light Cone

Reforged in Hellfire

Best 4-Star Light Cone

Resolution Shines As Pearls of Sweat

Best F2P Light Cone

Before the Tutorial Mission Starts

Talent Priority

Ultimate > Skill > Talent > Basic Attack

Recommended Endgame Stat Goals

Stat	Goal
HP	5,000+
Crit Rate	80%
Crit Damage	120%+
Speed	134+

Effect Hit Rate	LC dependent

Best Teams

Acheron Team
Ashveil Team
Follow-Up Attack Team
Hypercarry Team

Understanding Mortenax Blade's Build Philosophy

Before discussing relics, Light Cones, and stat priorities, players need to understand what actually makes Mortenax Blade powerful.

Many guides focus on his DEF shred.

Others focus on his HP scaling.

Neither is the real answer.

Everything revolves around one mechanic.

The 9-Point Charge Loop

When Mortenax Blade activates his Ultimate, he enters Infinite Fury and deploys the Bounded Field.

This field is the heart of his entire kit.

Inside the Bounded Field:

Balefire Bind spreads continuously
Enemies suffer 30% DEF Reduction
Enemies suffer 50% Vulnerability
Team damage increases dramatically

Most importantly:

Every ally attack generates Charge.

Once Mortenax Blade reaches 9 Charges:

He immediately triggers a Skill attack
Restores 25 Energy
Consumes no Skill Points
Deals massive HP-scaling damage
Counts as a Follow-Up Attack

This is why fast-action teams perform so well with him.

More ally actions create:

More Charges
More bonus Skills
More Energy
More Ultimate uptime
More Balefire Bind applications

The entire character scales through action frequency.

That's the core reason Mortenax Blade performs so well alongside Follow-Up teams and aggressive dual-DPS compositions.

Why His 160 Energy Ultimate Isn't As Scary As It Looks

One of the first things players notice is his massive 160 Energy Ultimate requirement.

On paper, that looks restrictive.

In practice, it's far less problematic than many expected.

Why?

Because his kit contains multiple forms of Energy recovery.

The 9-Point Charge Loop refunds 25 Energy every time it activates.

His signature Light Cone grants 20 fixed Energy at the start of each wave.

Before the Tutorial Mission Starts provides additional Energy generation.

Energy Regeneration Rope significantly smooths rotations.

As a result, most community testing has concluded that Mortenax Blade's Energy economy feels much better in real gameplay than it initially appears.

Best Relics for Mortenax Blade

Divine-Querying Master Smith (Best in Slot)

Community testing strongly favors Divine-Querying Master Smith as the safest and strongest farming destination.

The set feels almost tailor-made for Mortenax Blade.

Why It Wins

The set simultaneously improves:

HP scaling
Crit Damage
Team damage
Debuff synergy
Personal DPS

Because Balefire Bind constantly applies DEF reduction, maintaining its bonuses is extremely easy.

For most players, this should be the default recommendation.

Best Planar Ornament

Bone Collection

Currently considered his strongest general-use Planar Ornament.

Benefits include:

HP%
Crit Damage
Excellent scaling with HP-focused builds

Since Mortenax Blade naturally aims for 5,000+ HP, activating its bonuses is effortless.

Best Main Stats

Body

Crit Rate

Aim for roughly:

80% Crit Rate before combat buffs

His kit already provides additional Crit Rate and Crit Damage.

Reaching 80% generally pushes him close to 100% effective Crit Rate during combat.

Boots

Speed Boots (Recommended)

Post-launch testing increasingly favors Speed Boots.

Why?

Because Speed directly impacts:

Charge generation
Energy generation
Ultimate uptime
Debuff frequency

More turns mean more opportunities to maintain the 9-Point Charge Loop.

HP Boots

Still viable.

Particularly strong in:

Hypercarry teams
Low-Speed support setups
Sparkle-based compositions

However, Speed Boots generally provide more total account value.

Another reason F2P players are gravitating toward Mortenax Blade is that HP-focused relic farming is generally more forgiving than chasing perfect ATK/Crit hypercarry relics, making his endgame build path relatively accessible.

Sphere

HP%

Community consensus strongly favors HP%.

His kit already provides enormous amounts of damage amplification.

Additional HP scales more efficiently in most situations.

Rope

Energy Regeneration Rate

Best-in-slot for most builds.

This significantly improves Ultimate consistency and helps maintain Infinite Fury uptime.

Best Substats

Priority order:

Crit Rate
Crit Damage
HP%
Speed

Aim for:

80% Crit Rate
5,000+ HP
120%+ Crit Damage
134+ Speed

Once those thresholds are reached, additional HP becomes surprisingly valuable.

Talent Priority Explained

Ultimate > Skill > Talent > Basic Attack

Ultimate is the highest priority because it activates Infinite Fury, Bounded Field, Balefire Bind application, and the entire 9-Point Charge Loop.

Skill comes next because both manual and automatic Charge-triggered Skill activations scale directly from it.

Talent improves Charge generation efficiency and overall Energy flow throughout combat.

Basic Attack remains the lowest priority despite still appearing in some rotations.

Players should eventually level everything, but Ultimate and Skill provide the biggest performance gains first.

Best Light Cones for Mortenax Blade

S-Tier — Reforged in Hellfire

His signature remains the strongest option.

Key Benefits

HP%
Team amplification
Crit Damage vulnerability
20 fixed Energy at wave start

The Energy bonus is especially important because it enables Turn 0 Ultimate setups.

S-Tier — Resolution Shines As Pearls of Sweat

Many theorycrafters consider this his best non-signature option.

Benefits:

Additional DEF shred
Better team amplification
Strong Acheron synergy
Excellent overall account value

A-Tier — Before the Tutorial Mission Starts

Arguably the best free-to-play option.

Provides:

Strong Energy generation
Comfortable rotations
Easier Ultimate uptime

Especially useful for E0 players.

A-Tier — Good Night and Sleep Well

The strongest personal DPS-focused alternative.

If your goal is maximizing Mortenax Blade's individual damage, this remains an excellent choice.

Why Mortenax Blade Feels Surprisingly Tanky

One underrated aspect of his kit is survivability.

Many players now describe him as a pseudo-sustain character.

While he isn't a true healer or shielder, he provides:

Enemy taunts
Damage reduction
Increased healing received
Self-revival during Infinite Fury

This allows him to absorb pressure that would normally threaten more fragile supports.

It's one of the reasons sustainless and aggressive compositions feel so comfortable with him.

Best Teams for Mortenax Blade

Team 1 — Acheron Team

Core Setup

Mortenax Blade
Acheron
Nihility Support
Sustain

Why It Works

This remains one of the strongest partnerships in Version 4.3.

The Bounded Field constantly spreads Balefire Bind whenever allies attack.

That creates:

Reliable debuff generation
Faster Acheron stacks
Higher team damage
Exceptional Ultimate frequency

Many players consider him Acheron's best Fire Nihility partner.

Team 2 — Ashveil Team

Core Setup

Mortenax Blade
Ashveil
Tribbie
Sustain

This is currently one of the most discussed post-launch teams.

Ashveil benefits from:

Follow-Up interactions
Frequent ally actions
Universal damage amplification

Meanwhile Ashveil helps accelerate Mortenax Blade's Charge generation.

The synergy works in both directions.

Community Optimization Note

Post-launch testing suggests Mortenax Blade generally performs best alongside Abundance sustains rather than high-aggro Preservation characters.

Because parts of his kit encourage enemies to target him, sustaining through healers such as Hyacine can allow him to absorb more attacks, generate Charges more consistently, and maintain smoother Energy flow. Preservation units can still work, but they may reduce some of the natural value gained from his taunt and aggro-related mechanics.

Team 3 — Follow-Up Attack Team

This archetype fully exploits the 9-Point Charge Loop.

Fast attackers continuously feed Charges.

Each Charge cycle generates:

More Follow-Up attacks
More Energy
More debuffs
More damage

A major reason these teams perform so well is that Mortenax Blade's automatic Charge-triggered Skill counts as a Follow-Up Attack. This allows him to benefit from Follow-Up buffs while simultaneously feeding action-based teammates.

This is where Mortenax Blade's action-frequency scaling becomes most visible.

Team 4 — Hypercarry Mortenax Blade

Core Setup

Mortenax Blade
Sparkle
Tribbie
Sustain

A surprisingly strong alternative.

When built around directly, Mortenax Blade can function as a legitimate HP-scaling carry.

HP Boots become significantly more attractive in this setup.

E0 vs Signature Light Cone Reality Check

Does Mortenax Blade Need His Signature?

No.

His signature is excellent.

But unlike many modern DPS units, he remains highly functional without it.

Pull S1 If

You want Turn 0 Ultimate setups
You want smoother rotations
You want maximum optimization

Skip S1 If

You own Resolution Shines As Pearls of Sweat
You own Before the Tutorial Mission Starts
You're saving for future banners

For most players, E0 Mortenax Blade already delivers exceptional value.

Future Meta Potential

This is where Mortenax Blade separates himself from many traditional carries.

Damage dealers rise and fall based on numbers.

Mortenax Blade scales through systems.

His value comes from:

Debuffs
Team amplification
Follow-Up interactions
Action economy
Charge generation

Every future action-heavy character has the potential to improve him.

That's why many theorycrafters now describe him as an Account Glue Unit rather than simply another DPS.

He doesn't just benefit from future releases.

He helps future releases become stronger.

Final Verdict

Mortenax Blade is one of the safest investments in HSR 4.3 and one of the easiest characters to recommend building.

He offers:

Strong E0 performance
Powerful debuffs
Excellent HP-scaling damage
Acheron synergy
Follow-Up synergy
Energy utility
Long-term account value

His strongest builds focus on three core principles:

Maintain Ultimate uptime.
Feed the 9-Point Charge Loop.
Pair him with frequent-action teammates.

Master those fundamentals, and you'll unlock the full potential of one of the most versatile characters released in the entire 4.x era.

What separates Mortenax Blade from many recent releases is that he doesn't force players into a single archetype. Whether you're building Acheron teams, Follow-Up compositions, dual-DPS setups, or preparing for future action-heavy characters, he consistently provides value. That's why post-launch community sentiment has shifted from "strong debuffer" to "one of the most flexible account investments in Version 4.3."

❓ FAQ — Mortenax Blade Build Guide (HSR 4.3)

❓ Is Mortenax Blade worth building at E0?
Yes. He performs extremely well at E0 and already provides strong debuffs, Follow-Up synergy, and team-wide utility without needing Eidolons.

❓ Does Mortenax Blade need his signature Light Cone?
No. His signature is strong for optimization, but F2P and 4-star options like Resolution Shines As Pearls of Sweat work very well.

❓ What is the Charge Loop in Mortenax Blade’s kit?
It is his 9-Point system where ally actions generate Charges, triggering bonus Skills that deal HP-scaling Follow-Up damage and restore Energy.

❓ What stats are most important for Mortenax Blade?
Prioritize 80% Crit Rate, 5,000+ HP, solid Crit Damage, and 134+ Speed for consistent Charge generation and Ultimate uptime.

❓ Which teams work best with Mortenax Blade?
He performs best in Acheron teams, Follow-Up Attack teams, Ashveil synergy teams, and flexible Hypercarry setups.

👉 Next recommended reads: