Freyja

Weapon: Nightmare Horn

Assist: Positional Assist / Flexible

Special: Noontime / Sol

Passive A: Atk/Spd Solo / Kestrel Stance 

Passive B: Binding Necklace

Passive C: Pulse Smoke / Joint Drive Skills / Flexible

Sacred Seal: Spd/Res Solo / Swift Stance / Quick Riposte

• Freyja excels at performing a defensive role—particularly in Aether Raids—thanks to the powerful effects of her exclusive Nightmare Horn, combining both Distant Counter and Speed-based damage reduction (up to a massive 40%) into a single weapon; this mitigates a significant damage while allowing her to check a wide breadth of foes. A +SPD IV is thus her ideal choice here as maintaining high Speed is crucial to her success, though +ATK and +RES are decent alternatives.
• It should be noted before going further that although potential alterations can be made, the majority of this set retains her base kit—simply equipping her with a seal can complete her build. That being said, Freyja’s default Luna should be swapped out in favor of a healing Special to supplement her tanking capabilities with consistent sustain. If Brave Lucina support is available, use Noontime; otherwise, Sol is preferred.
• Since Nightmare Horn comes packed with Distant Counter, Freyja is free to use other A slot skills. Her base Atk/Spd Solo is especially powerful for its mixed-phase utility and compatibility with Binding Necklace, though it can be replaced by Kestrel Stance should a more defensive lean be favored; its Guard effect is especially useful against foes with built-in doubles since she can’t equip Null Follow-Up to counter such threats. 
• Binding Necklace operates as a significantly better Lull, not only rendering her opponent’s visible buffs useless but also stealing them for herself—and even if there are no such buffs to benefit from, Binding Necklace still provides Freyja with an effective +4 stat advantage at base for improved combat prowess. Attached to an easily-satisfied condition, this skill should rarely be replaced here.
• The Lady of Nightmare’s base Pulse Smoke is a natural fit for an Aether Raids Offense tank build to dismantle teams centered around instant Special activations, such as Infantry Pulse setups. For other modes where it may not be as necessary, her C slot is open to pretty much anything; standouts include Joint Drive Spd and Spd Smoke.
• Lastly, the Spd/Res Solo and Swift Stance Sacred Seals are among Freyja’s best options to further supplement her key stats. Although she will usually be fast enough to outspeed most opponents, the Quick Riposte seal may be a worthwhile candidate to breakthrough Impact effects that would otherwise negate her follow-up.

Weapon: Nightmare Horn

Assist: Positional Assist / Flexible

Special: Galeforce

Passive A: Heavy Blade / Atk/Spd Solo 

Passive B: Binding Necklace / Wings of Mercy 

Passive C: Smoke Skills / Savage Blow / Joint Drive Skills / Flexible

Sacred Seal: Quickened Pulse / Heavy Blade 

• Although her base kit places a heavy emphasis on Freyja’s tanking capabilities, the Lady of Nightmare can instead opt for a much more aggressive approach thanks to the flexibility of her PRF skills, excellent offenses, and extended mobility. This set is geared for Galeforce-centered strategies in Aether Raids Offense, though it can see good use elsewhere too. An Asset to either of her offensive stats will work perfectly fine here. 
• Galeforce comprises the bulk of Freyja’s functionality with this set, allowing her to make multiple initiations in a single turn to quickly pinpoint and sweep through the enemy forces alongside her allies through its self-refreshing effect. Unlike most other Galeforce units, though, Freyja is unique in that she can simultaneously act as a pseudo-tank due to having innate damage reduction and Distant Counter.
• Specifically for AR-O, it’s recommended to equip Freyja with Heavy Blade 4 + Quickened Pulse; this is desired to perform the team’s Galeforce chain without delay. Together, this combination allows Freyja to activate the Special against any opponent as long as she doubles, Heavy Blade triggers, and her foe doesn’t have a Guard effect. However, outside of AR-O, Freyja can safely keep her default Atk/Spd Solo and equip the Heavy Blade Sacred Seal instead.
  • Regardless of the specific mode, though, keeping Freyja transformed consistently will prove crucial to ensure her ability to activate Heavy Blade without resistance.
• Freyja’s exclusive Binding Necklace once again remains one of her best B slot options, as the stat advantage it provides is greatly appreciated to cement her damage output, doubling consistency, and Heavy Blade activations. Although Wings of Mercy tends to be a staple among Galeforce units within the context of AR-O, Freyja’s base cavalry mobility may prove sufficient in most cases—though equipping Wings of Mercy is always an option nonetheless.
• Smoke skills work excellently with Galeforce builds such as this one, aiding Freyja’s subsequent matchups following her first initiation through the debuffs they apply. Those that apply stat debuffs are generally preferred, but Freyja’s ability to serve as a tank at the same time does make her base Pulse Smoke a potential candidate too. Other options include Joint Drives (to mutually buff herself and her allies in Galeforce chains) and Savage Blow.

Weapon: Nightmare Horn

Assist: No Assist / Positional Assist 

Special: Moonbow / Galeforce

Passive A: Atk/Spd Push / Swift Sparrow / Fury

Passive B: Binding Necklace

Passive C: Panic Smoke / Joint Drive Skills / Distant Guard / Flexible

Sacred Seal: Swift Sparrow / Hardy Bearing / Sturdy Blow / Death Blow / Heavy Blade

• Despite her status as an offensive Mythical Hero, Freyja’s various strengths lend themselves perfectly—almost a little too well—to the realm of Aether Raids Defense and can potentially be built for such an environment. Once more, a +ATK or +SPD IV will be ideal, though +ATK may be slightly more preferable to frontload as much damage as possible.
• Freyja’s Special choices are somewhat varied, but her best options are those with low cooldowns. Among them, Moonbow is exceptional to punish high Defense foes, dealing a good amount of burst damage against them. Using Galeforce + Heavy Blade is a potential alternative to catch challengers off guard, but this may not always be consistent. 
• Although Atk/Spd Solo is a fantastic A slot skill choice in most other settings, using it while Freyja is on a Defense team can be unwieldy given how she will typically be packed closely next to her allies. For this reason, Atk/Spd Push 4 is recommended instead for its similar dual phase functionality and lack of positioning requirement. Other skills include Swift Sparrow and Fury.
• Binding Necklace shines here especially brightly due to the ubiquitous nature of visible buffs among challenging teams, thus enabling Freyja to exploit that for her own benefit. This may discourage opponents from actually applying buffs on their units, but that itself is an advantage to her team’s favor and she still benefits from a +4 stat advantage regardless as long she’s not adjacent to an ally (which she shouldn’t be if she’s baited into attacking). 
• Panic Smoke works similarly in that it also serves to deter foes from using buffs and punish them if they do so anyway, except this time her allies can benefit from a combat boost as well against the debuffed foes. This is rather cost-intensive, though, so if nothing else, skills that provide in-combat boosts are always good choices; some of the best in this category include Joint Drives and Distant Guard. 
• Freyja’s Sacred Seal slot is flexible and remains open to any option that complements her offensive stats, such as Swift Sparrow, Sturdy Blow, and Death Blow. Hardy Bearing may be worthwhile if there are no other checks to Vantage units or if more are desired.