Cartethyia Build Guide

What to know before spending pulls

Her full dual-form rotation works at S0. Team Aero Erosion matters because targets with one to three stacks take 30% more damage from Cartethyia, with another 10% per stack above three up to three additional stacks. Build Crit and HP, and use teammates who apply or support Aero Erosion before considering an extra copy.

Do you need the signature weapon?

Defier's Thorn is Cartethyia's featured weapon. At level 90 it has 413 ATK and 72.225% HP. It also grants 12% Max HP; after Intro or Basic Attacks it provides 8% DEF ignore, and targets with at least one Aero Erosion stack take 20% amplified damage. Guardian Sword is the listed 3-star HP option with 300 ATK and 30.375% HP, plus 12% Resonance Skill DMG Bonus. Defier's Thorn supports her HP scaling and Aero Erosion condition directly, while Guardian Sword is an obtainable HP placeholder with much lower stats.

Another character copy or the weapon?

S1 means Cartethyia's first Resonance Chain upgrade. Defeating an Aero Erosion target can transfer that defeated target's stack count to the next enemy hit, and Fleurdelys gains 25% Crit DMG at each 30-point Conviction threshold, up to four stacks until Blade of Howling Squall. Defier's Thorn instead supplies a large HP stat and amplifies damage against any eroded target. S1 adds multi-wave utility and rewards completing the Conviction meter; the weapon strengthens every normal S0 cycle.

Advice for your account

Easy rotation

Enter through Intro to apply two Aero Erosion stacks and summon Sword of Discord's Shadow. Complete Cartethyia's four-stage Basic Attack to summon Sword of Divinity's Shadow, then cast Resonance Skill for two more Aero Erosion stacks and Sword of Virtue's Shadow. Jump and use Mid-air Attack to recall all three Shadows, gaining Heart of Virtue, Mandate of Divinity, and Power of Discord. Cast A Knight's Heartfelt Prayers to transform into Fleurdelys for 12 seconds. Use Fleurdelys Basic Attacks, the two-part Resonance Skill, and enhanced Heavy Attacks to build 120 Conviction. Cast Blade of Howling Squall before Manifest ends to consume Conviction, restore 50% Max HP, and spend the target's Aero Erosion stacks on the finisher.

Opening vs. repeat cycles

Intro supplies the Discord Shadow and two Aero Erosion stacks on entry. Without Intro, Cartethyia can create the same Shadow with her Heavy Attack, but that costs another action before the recall. Every Sword Shadow lasts 20 seconds and only one of each type can exist, so create and recall all three within the same setup.

Why this skill priority

Liberation, Forte Circuit, and Basic Attack lead because transformation, Manifest, Conviction, Blade of Howling Squall, every Fleurdelys move, and the three Sword Shadows form one linked cycle. Resonance Skill supplies the Virtue Shadow, applies two Aero Erosion stacks, and becomes the two-part Conviction-building attack in Fleurdelys form.

Required buffs and assumptions

The full setup assumes Intro is available and all three Sword Shadows are recalled before transformation. Manifest lasts 12 seconds and ends through its timer, Blade of Howling Squall, or certain interactions. Fleurdelys's key finishers trigger one Aero Erosion damage instance and consume one stack, so teammates should establish enough stacks before and during the window.

Energy Regen target

No minimum Energy Regen target is listed in the current build data. A Knight's Heartfelt Prayers needs Resonance Energy for the initial transformation, but manually moving between Cartethyia and Fleurdelys during Manifest costs no energy. Blade of Howling Squall depends on 120 Conviction rather than a second energy payment.

Troubleshooting