Mortenax Blade Guide โ HP-Scaling Fire Bruiser (v4.3)
TL;DR
Mortenax Blade is a high-risk, high-reward 5โ Fire Nihility bruiser who burns his own HP to deal massive AoE damage that scales off Max HP. His Ultimate triggers Infinite Fury stance, dropping a Zone that shreds enemy DEF and supercharges his Basic Attack (0 SP cost). On fatal damage while in stance, he exits automatically and heals 50% of Max HP โ giving him extreme survivability. Best team: Mortenax Blade + Sunday + Robin + Lingsha. Core mechanics: HP consumption, Max HP scaling, Zone DEF shred, self-sustain stance exit.
Community Consensus
Mortenax Blade is rated T0 across major tier lists (Prydwen, NGA, Reddit) as both a main DPS and universal sub-DPS/support similar to Tribbie but with stronger personal damage. His banner is currently running in HSR 4.3 and ends June 24, 2026. Community polls rank him as a top-pull priority for players who need a flexible Nihility unit that slots into multiple team archetypes โ from hypercarry to dual-DPS with Acheron.
How His Kit Works
Mortenax Blade's rotation revolves around managing his HP pool to maximize Infinite Fury uptime. His Skill consumes a fixed percentage of his Max HP to deal Fire AoE damage โ the lower his HP, the more bonus damage from his Talent. His Basic Attack costs 0 SP and hits all enemies, making him extremely SP-efficient. Casting his Ultimate (140 energy) triggers Infinite Fury stance for 3 turns, dropping a Zone that shreds enemy DEF by up to 30% (scales with his Max HP). While in stance, his Basic Attack is enhanced to deal massive AoE damage and his Skill HP cost is halved. If Mortenax would take fatal damage during Infinite Fury, he instantly exits the stance and heals for 50% of his Max HP โ a powerful failsafe that makes him deceptively tanky despite the self-burn playstyle. Community-tested mechanic: the Zone remains on the field for the full stance duration even if Mortenax is knocked out of the stance early, ensuring the DEF shred stays active.
Optimal Team
| Slot | Character | Role |
|---|---|---|
| Main DPS | Mortenax Blade | HP-scaling AoE carry / Zone DEF shred |
| Support | Sunday | Action Advance + energy battery + DMG buff |
| Support | Robin | Team-wide ATK buff + FUA advance + CC |
| Sustain | Lingsha | Healing + Break assist + cleanse |
Alternative team (Dual DPS): Mortenax Blade + Acheron + Jiaoqiu + Aventurine โ Mortenax's Zone DEF shred and frequent debuffs massively accelerate Acheron's Ultimate stacks.
Relic Priority
- 4pc The Wind-Soaring Valorous โ ATK% + Ultimate DMG + FUA after Ultimate (synergizes with Infinite Fury stance entry/exit)
- 4pc The Ashblazing Grand Duke โ FUA + ATK% stacking (consistent if running him as sub-DPS)
- Planar: 2pc Duran, Dynasty of Running Wolves โ FUA DMG + stackable DMG%
- Planar alt: 2pc Broken Keel โ CRIT DMG + Effect RES (boosts team utility)
- Main stats: HP% body, SPD boots, Fire DMG% orb, HP% rope
- Substats priority: HP% > SPD (134+ breakpoint) > CRIT Rate > CRIT DMG
Light Cones
| Priority | Light Cone | Relative DMG |
|---|---|---|
| 1 | Those Many Names (S1) โ Signature | 100% |
| 2 | Solitary Healing (S5) โ Craftable | ~82% |
| 3 | Good Night and Sleep Well (S5) | ~78% |
| 4 | Before the Tutorial Mission Starts (S5) | ~72% |
| 5 | Boundless Choreo (S5) | ~68% |
Source: Fribbels HSR Optimizer community calculations and Prydwen simulations.
FAQ
Is Mortenax Blade good at E0S0?
Yes, very strong at E0S0. His base kit is fully functional โ the Zone DEF shred and Infinite Fury stance are unlocked at E0. S1 (Those Many Names) is roughly an 18% damage increase over Solitary Healing, but he performs well even without his signature. E1 boosts Zone duration, which is nice but not mandatory.
What is the best F2P light cone for Mortenax Blade?
Solitary Healing (S5) โ craftable from Herta's Store. It provides Energy Regeneration and DMG% based on debuffs applied, both of which synergize perfectly with his playstyle. Good Night and Sleep Well (S5) is a close second if you have it from gacha.
Can I use Mortenax Blade without limited 5-star units?
Yes. A strong F2P-friendly team: Mortenax Blade + Pela + Tingyun + Gallagher. Pela applies AoE DEF shred (stacking with Mortenax's Zone), Tingyun batteries his Ultimate for faster stance uptime, and Gallagher provides healing and debuff support. This team clears MoC 12 in 3-4 cycles with decent relics.
What speed should Mortenax Blade target?
134 SPD minimum (first action value breakpoint). With Sunday's action advance, you don't need extremely high SPD. Aim for 134-145 SPD and invest the rest into HP% and CRIT substats.
How We Build This Guide
- Damage comparisons from Fribbels HSR Optimizer community data
- Tier rankings from Prydwen, NGA, Reddit community polls
- Clear data from community MoC tracking
- Updated each version