HSR SP Mortenax Blade Guide | High Support Value + Strong Damage! Strength Analysis

Rarity / Element / Path

5-star Fire・Nihility

Core Role

AoE main DPS, HP-consuming damage dealer, relies on field effects and follow-up attacks

Core Traits

Consumes HP to increase damage, enhances skills during field duration, triggers off-turn follow-up attacks through debuff stacking

Basic ATK

Deals Fire DMG based on Mortenax Blade’s Max HP and applies a Taunt effect. Damage is greatly boosted within the field.

Skill

Consumes self HP to unleash AoE damage. No Skill Points cost. Counts as a follow-up attack while inside the field.

Ultimate

Summons the Boundless Wrath Field, inflicts debuffs on enemies and unlocks enhanced Ultimate.

Talent

Gains charge stacks for each debuff on enemies during field duration. Full charge triggers automatic follow-up Skill and Energy recovery.

Technique

Grants massive DMG reduction and AoE Taunt upon entering battle, greatly boosting early survivability.

Recommended Set

4-Pc Masterpiece of the Divine Craftsman + 2-Pc Bone Collection’s Serene Demesne

Masterpiece of the Divine Craftsman 4-Pc

Increases HP by 12%. When the wearer deals damage to enemy targets affected by DEF reduction, the wearer’s CRIT DMG increases by 28%. After the wearer applies DEF reduction to enemy targets, all allies gain Kindling for 4 turns. This effect cannot stack. Allies with Kindling deal 28% increased damage. This effect can be triggered again after the wearer launches an attack.

Bone Collection’s Serene Demesne 2-Pc

Increases the wearer’s Max HP by 12%. When the wearer’s Max HP is 5,000 or higher, increases the CRIT DMG of the wearer and their memosprite by 28%.

Main Stats

HP% Body, HP% Boots, Fire DMG Sphere, HP% Rope

Substat Priority

HP% > CRIT Rate / CRIT DMG > Effect Hit Rate > SPD

Build Notes

Prioritize Max HP first, then increase CRIT stats as much as possible. Effect Hit Rate is useful for improving debuff consistency, while SPD is secondary.

5-star Signature

New Husk That Burns the Inferno

⭐⭐⭐⭐⭐ Best Choice

Provides a large Max HP bonus and increases CRIT DMG. It perfectly matches Mortenax Blade’s HP-consuming playstyle and high-frequency Skill rotation.

4-star Premium Option

Holiday Thermae Escapade S5

⭐⭐⭐⭐

A strong utility Light Cone that increases damage while applying additional vulnerability-style debuffs to enemies.

4-star Alternative

Good Night and Sleep Well

⭐⭐⭐⭐

Increases damage against enemies with debuffs, making it compatible with Nihility teams, but it lacks extra support value compared with stronger options.

Premium Follow-Up Team

Mortenax Blade + Ashveil + Tribbie + Hyacine

The whole team applies debuffs frequently, maximizing follow-up damage while combining sustain, damage amplification, and off-turn pressure.

Players pursuing high ceiling performance, Memory of Chaos, Pure Fiction, or endgame leaderboard-style clears.

Premium Burst Team

Mortenax Blade + Acheron + Tribbie + Hyacine

Mortenax Blade’s field helps stack debuffs quickly, enabling Acheron to charge her Ultimate faster while benefiting from AoE vulnerability and damage amplification.

Players who already own Acheron and prefer fast-clear burst setups.

E1

Basic ATK deals additional damage while the field is active.

Minor Upgrade

Provides a small damage increase, but it is not essential.

E2

Improves charge generation efficiency and greatly increases follow-up attack damage.

Major Breakpoint

A key Eidolon that improves both damage output and rotation consistency. This is the priority upgrade for players chasing strength.

E4

After using the enhanced Ultimate, the entire team gains SPD.

Utility Upgrade

Improves the team’s action economy and overall combat rhythm.

E6

Reduces the charge requirement and further strengthens follow-up damage.

Whale / Best-in-Slot

Fully unlocks Mortenax Blade’s damage ceiling and makes his follow-up rotation much smoother.