Honkai: Star Rail Mortenax Blade Build

A Broken Blade Still Slays

Single Target

Single Target | Energy Gen 40 | Break 60 Deals Fire DMG equal to 50% of Mortenax Blade's Max HP to one designated enemy, and causes the target to enter the Taunt state for 1 turn. A Tempered Blade Severs Souls Single Target | Energy Gen 40 | Break 60 Deals Fire DMG equal to 100% of Mortenax Blade's Max HP to one designated enemy, and causes the target to enter the Taunt state for 1 turn.

A Rain of Blades Seals Fate

AoE

Consumes HP equal to 20% of Mortenax Blade's Max HP and deals Fire DMG equal to 72% of Mortenax Blade's Max HP to all enemies, and additionally deals 8 instance(s) of DMG, with each instance dealing Fire DMG equal to 24% of Mortenax Blade's Max HP to one random enemy. If the current HP is insufficient, Mortenax Blade's current HP will be reduced to 1 when he uses Skill. While not in the "Infinite Fury" state or when the current HP is 1 or lower, Mortenax Blade cannot use his Skill. Using Skill does not consume Skill Points.

Fornax Ex Corpore

Enhance

Inflicts "Balefire Bind" on all enemies. Enemy targets in the "Balefire Bind" state have their DEF reduced by 40% and the DMG they receive increases by 60%, lasting for 4 turn(s). Then, consumes HP equal to 40% of Mortenax Blade's Max HP to deploy a Zone. While the Zone is active, Mortenax Blade enters the "Infinite Fury" state. During the "Infinite Fury" state, increases CRIT Rate by 40%, increases CRIT DMG by 60%, enhances Basic ATK, unlocks Skill, and gains a new Ultimate "Tenax Per Ignem." When receiving a killing blow, this unit will not be knocked down, but will dispel the Zone, exit the "Infinite Fury" state, and restore HP equal to 100% of this unit's Max HP. When gaining the "Infinite Fury" state, a corresponding countdown appears on the Action Order. The countdown has a fixed SPD of 140. At the start of the countdown's turn, dispels the Zone and exits the "Infinite Fury" state. If the current HP is insufficient, Mortenax Blade's current HP will be reduced to 1 when he uses this ability. Tenax Per Ignem AoE | Energy Cost 320 / Gen 10 | Break 120/hit Deals Fire DMG equal to 420% of Mortenax Blade's Max HP to all enemies.

All Karma Comes Due

Support

While the Zone is active, after each attack an ally target uses on an enemy, inflicts the "Balefire Bind" state on the corresponding enemy target and grants 1 Charge to Mortenax Blade. When Charge reaches 18 points and the current HP is more than 1, consumes 18 Charge, regenerates 30 Energy, and enables Mortenax Blade to use Skill 1 extra time. This extra Skill use is considered as Follow-Up ATK.

Blade's Reach Spares None

Break

Immediately attacks all enemies within a certain range. After entering combat, inflicts the Taunt state on all enemies for 1 turn and decreases DMG taken by this unit by 180% for 4 turn(s).

Ere My Death, I Stood Unmade

While the Zone is active, decreases all enemies' All-Type RES by 40%. After using the extra Skill from Talent, the "Infinite Fury" countdown has its action delayed by 30%.

Ash Was My Heart, Yet the Flame Stayed

When an ally character uses Ultimate to deal DMG, it is considered as having launched Follow-Up ATK. And the Follow-Up ATK DMG dealt by ally targets increases by 150%. The upper limit of Mortenax Blade's Charge decreases to 14.

Across the Shore, Wrath Laid Bare

Ultimate Lv. +2, up to a maximum of Lv. 15. Talent Lv. +2, up to a maximum of Lv. 15.

Odium I've Smitten, Thence Came the Blade

"Heart, Refined ad Infinitum" additionally increases ally targets' DMG dealt by 100%.

I Severed My Woes, Knowing Death Begets Life

Skill Lv. +2, up to a maximum of Lv. 15. Basic ATK Lv. +1, up to a maximum of Lv. 10.

If Immortality Could Die, I Swore THEM Slain

As the Zone persists, when Mortenax Blade takes DMG or consumes HP, he gains 1 Charge. This effect can trigger again after any target's turn ends. The DMG multiplier of "Tenax Per Ignem" increases to 300% of its original value.

Bone, Hardened ad Nauseam

Mortenax Blade can accumulate up to 160 overflow Energy. After using Ultimate, clears it and regenerates a corresponding amount of Energy. When the battle starts or when the Zone is dispelled, if Energy is below 150%, it is immediately regenerated to 150%. When Energy is regenerated to its maximum, dispels all debuffs from this unit.

Soul, Tempered ad Mortem

While the Zone is active, increases the chance of being attacked by enemies, decreases DMG taken by this unit by 100%, and increases Incoming Healing by 100%. After being attacked, inflicts the "Balefire Bind" state on the corresponding target, and enables Mortenax Blade to gain 1 Charge.

Heart, Refined ad Infinitum

While the Zone is active, ally targets deal 100% increased DMG. If there are other Nihility characters aside from Mortenax Blade in the team, Ultimate DMG dealt by ally targets increases by 150%. Otherwise, DMG dealt by Mortenax Blade additionally increases by 150%.