Erinys

Weapon: Silesse Frost

Assist: Positional Assist / Flexible

Special: Glimmer / Luna / Moonbow / Bonfire

Passive A: Atk/Spd Solo / Impact Skills / Swift Sparrow / Atk/Spd Push 

Passive B: Dive-Bomb / Chill Skills / Aerobatics / Flier Formation

Passive C: Rein Skills / Joint Drive Skills / Flier Buffs / Flexible

Sacred Seal: Heavy Blade / Atk/Spd Solo / Swift Sparrow / Death Blow / Atk/Def Solo

• Erinys’ stellar base offensive stats combined with her Silesse Frost makes a purely damage-focused build quite attractive. She will greatly benefit from receiving a +ATK or +SPD IV here to further supplement her damage ceiling—and with both being four-point Assets, either can be put to fantastic use.
• Glimmer and Moonbow are fantastic Special options when equipped with the Heavy Blade Sacred Seal, as this quickly allows Erinys to fire them off on her second hit—and potentially her fourth hit with quad-strike setups—in every engagement that Heavy Blade procs. If using another Sacred Seal is being used or if simply wanting a higher damage ceiling, Luna and Bonfire are strong alternatives. 
• Most standard offensive A slot skills will work here to frontload as much damage as possible; those that boost both Attack and Speed are generally preferable, but Sturdy Impact and Mirror Impact are notable exceptions for their ability to make initiations much safer while still enhancing her raw damage.
• Erinys can make fantastic use of Dive-Bomb to quickly unleash a flurry of four strikes —akin to Desperation but without requiring her to take damage beforehand—and maximizes her killing effectiveness, though it does disallow the use of skills like Fury and Atk/Spd Push. More readily available alternatives include Chill skills and movement-based skills like Aerobatics and Flier Formation. 
• The Earnest Knight’s C skill is entirely flexible, but skills that help her push her damage higher like her base Atk/Def Rein and Joint Drives (which also provide support to her allies) work best. Flier buffs are also excellent when using Erinys within class-exclusive compositions. For her Sacred Seal, Heavy Blade or virtually any offense-enhancing ability is recommended. 

Weapon: It’s Curtains…+ (+ATK) / Silesse Frost

Assist: Positional Assist / Flexible

Special: Galeforce

Passive A: Heavy Blade 4 

Passive B: Wings of Mercy / Hit and Run

Passive C: Smoke Skills / Odd Tempest / Joint Drive Skills / Flexible

Sacred Seal: Quickened Pulse 

• Although this build retains an aggressive Player Phase approach, the focus is centered around Erinys’ performance specifically within Galeforce-centric compositions for use in Aether Raids Offense—rather than general gameplay. A +ATK IV is coveted over all else to ensure her Heavy Blade activations, as this is crucial to her functionality. 
• The main purpose of this set is to leverage Galeforce’s self-refreshing quality to have Erinys and her allies quickly neutralize the opposing Defense team during the Player Phase. This, however, comes with the caveat of having to work around Galeforce’s lengthy cooldown, which can be approached a few different ways. 
  • For maximum efficacy and self-sufficiency, trading out Erinys’ Silesse Frost for an Attack-refined It’s Curtains… enables her to drop down Galeforce’s cooldown to three—and with Heavy Blade and the Quickened Pulse Sacred Seal, she can activate it in a single hit as long as Heavy Blade activates. 
  • If neither It’s Curtains… nor Velouria’s Wolfpup Fang support is available, one can keep her Silesse Frost and try to have Erinys activate Galeforce in two hits instead by maintaining the Heavy Blade + Quickened Pulse combination. 
  • However, this is much riskier because 1) she will almost always need to be the second person to enter the Galeforce chain since Silesse Frost’s Brave effect requires her support partner nearby and 2) Erinys’ high offense power may end up having her kill the engaged foe in one hit before Galeforce fully charges. 
• Wings of Mercy is a prime B skill choice to get close to the enemy team without needing outside assistance (such as from an Assist like Smite), though a displacement skill like Hit and Run may also be worth considering to quickly retreat after activating Galeforce.
• Smoke skills—and to an extent, Savage Blow—are a natural choice to improve the quality of Erinys’ subsequent matchups, as are Joint Drive Skills to mutually buff herself and nearby allies in the Galeforce chain. Although rare, dedicated Erinys fans may find Odd Tempest an interesting choice to grant her cavalry-esque mobility with the advantage of being unhampered by terrain, though this is unnecessary if using something like Duo Palla in the same team.