Winter Mirabilis

Weapon: Dreamflake / Weaponless

Assist: Whimsical Dream 

Special: Moonbow / Luna / Miracle

Passive A: Fort. Def/Res / Bracing Stance 

Passive B: Sabotage Skills / Wings of Mercy / Disarm Trap / Spd Cantrip / Chill Skills / Aerobatics 

Passive C: Ground Orders / Drive Skills / Tactic Skills / Flexible

Sacred Seal: Aerobatics / Flier Formation / Chill Skills / Guidance / Tactic Skills / Phantom Res

• Winter Mirabilis’ strengths are naturally attuned towards aiding her teammates, and this build sets to essentially ramp up her supportive value as much as possible — with, of course, consideration to her varying options across different game modes. 
• Fort. Def/Res works excellently for general usage for the same reason a +RES IV is recommended: increasing Mirabilis’ visible Resistance lets her serve as a “sponge” for potential sources of debuffs like the Dark Shrine structure, and combines well with Sabotage skills to enhance her ability to land debuffs through them. 
  • Those aiming to use Winter Mirabilis in Aether Raids Defense, however, are better off retaining her base Bracing Stance to deter Galeforce strategies, as built-in Guard effect helps throw off their ability to fulfill the stringent cooldown reduction requirements. In contrast, Fort. Def/Res doesn’t contribute much other than reducing her chances of initiating needlessly.
  • Even then, if that is to be avoided, it’s generally better to just not equip her Dreamflake at all. Doing so does come at a slight cost to Mirabilis’ debuffing capacity, but her Whimsical Dream is still plenty powerful to make her a threat — and truthfully, depending on your composition and rank, it may be better to lose out on the potential -5 Attack debuff over having the looming risk of your refresher being baited and neutralized on the first turn. 
• For her B skill, Winter Mirabilis’ variety in candidates is a tad overwhelming, but each has their own specific niche / usage as follows:
  • Sabotage — and, to a lesser extent, Chills — are great general-use skills that ensure Mirabilis can maintain an active presence even before using Whimsical Dream, applying mapwide debuffs for reduced enemy efficiency; this also enables the effects of Dreamflake right off the bat.
  • Cantrip skills work similarly in their ability to debilitate foes and offer slightly better values than Sabotages, but are somewhat more limiting considering their activation is tied to the usage of Whimsical Dream and don’t have quite as much potential range. Spd Cantrip is okay on budget, but otherwise easily replaceable. 
  • Disarm Trap is an Aether Raids Offense-specific B skill that guarantees Mirabilis ability to dance regardless of layout, and may come of particular value when using her within Galeforce compositions who can be greatly troubled by the presence of traps that negate crucial turns for cooldown accumulation. She’s one of the few dagger-wielding refreshers in the game, so this is a more unique niche to consider.
  • Skills that feature movement-based mechanisms like Wings of Mercy, Aerobatics, and Flier Formation are universally appreciated: having more wiggle room in positioning is always a plus for offensive strategies, and the increased unpredictability that comes attached makes them a staple for Aether Raids Defense builds as well. 
• Ground Orders is a phenomenal C skill that shines everywhere, and Winter Mirabilis is fortunate enough to have this included into her base kit from the beginning. Rarely should it be replaced, unless you prefer increasing ally stats instead (through skills like Atk Tactic or Drive Atk) or slot her alongside other flying allies (in which case you can use the alternative Air Orders). Ultimately, anything that bolsters her team’s performance works here so the C slot is flexible, and the same applies for her Sacred Seal.

Weapon: Dreamflake / Courtly Mask (+RES) / Barbed Shuriken (+RES)

Assist: Whimsical Dream 

Special: Sol / Noontime / Moonbow 

Passive A: Bracing Stance / Close Foil / Close Ward / Mirror Stance 

Passive B: Wings of Mercy / Quick Riposte / Aerobatics / Sabotage Skills / Mystic Boost

Passive C: Ground Orders / Atk/Def Rein / Guidance / Tactic Skills / Drive Skills / Flexible

Sacred Seal: Quick Riposte / Iote’s Shield / Solo Skills / Distant Def / Guidance / Mystic Boost

• Like her original iteration, Winter Mirabilis features surprisingly solid Attack, Defense, and Resistance values despite her refresher status; those wanting some variability in her playstyle can accordingly exploit this to have the fairy adopt a more defensive, combat-heavy lean. Increasing either Defense or Resistance complements this purpose for directly reduced physical and magical damage respectively, but +ATK is always a serviceable back-up choice.
• Keeping her exclusive Dreamflake equipped remains a good course of action to strike a balance between combat and support as the in-combat Attack debuff aids not only her allies, but her own survivability as well — her opponent simply has to be afflicted by a penalty, and this can be achieved by merit of the aftermath of using Whimsical Dream among other means. 
  • However, if greater combat potential is desired, you are likely to get better mileage out of Courtly Mask for its stat enhancements and essentially guaranteed damage reduction effect — Mirabilis’ abysmal Speed means she will pretty much always be doubled. Barb Shuriken is a low-investment-friendly alternative that improves her survival via faster healing Special activations.
• The innate Guard effect and synergistic stat boosts of Winter Mirabilis’ native Bracing Stance makes it one of her best A skills here; it adds to her raw durability while preventing enemies from exploiting her susceptibility to follow-ups to activate their Special. It doesn’t do anything for her damage, though, so Mirror or Sturdy Stance are possible replacements that remedy this while retaining much of the same defensive benefits of Bracing Stance. Close Foil and Close Ward are more niche (and truthfully highlighted merely for the sake of fun), extending her defensive capabilities to a broader range of enemies rather than purely ranged.
• Quick Riposte is entirely non-negotiable here. Because of her low Speed, she is unable to perform follow-up attacks on her own and her raw Attack isn’t high enough here to land one-shots with consistency, so she needs Quick Riposte in order to actually neutralize threats rather than simply facetank — the question simply becomes whether this will be as a B skill or Sacred Seal.
  • If you use it as her B skill:
    • This opens up her Sacred Seal slot for Iote’s Shield, removing the looming threat of effective damage from archers and other units; this is useful to  transform Mirabilis into a more general purpose ranged tank, since she’ll otherwise be good for soaking purely magic. 
    • Alternatively, this allows her to combine the benefits of automatic follow-up attacks with elevated anti-magical properties and survival through the Mystic Boost Sacred Seal; this couples surprisingly well with Close Ward due to negation of adaptive damage as well. While Mystic Boost is available as a B skill as well, it’s substantially more scarce than Quick Riposte as a Skill Inheritance option.
    • You could also use this as an opportunity to amp up her base distribution through seals like Atk/Res Solo, which may be valuable at lower investment levels.
  • If you use it as her Sacred Seal:
    • This provides the flexibility of equipping B skills that are currently not available as Sacred Seals, such as Wings of Mercy or Sabotage skills. 
    • Speaking of, Sabotages stand out as one of Mirabilis’ more interesting choices within this build, as they serve to benefit both her own performance and that of the rest of the team; everyone can benefit from further stat differentials against incoming threats, especially if Dreamflake remains equipped. 
• Her C skill and Sacred Seal are both largely flexible; depending on whether you want Mirabilis to emphasize assisting allies or augmenting her own tanking capacity, her options range from things like Ground Orders or Tactics to Atk/Def Rein and Smoke skills. 

Weapon: Broadleaf Fan (+ATK) 

Assist: Whimsical Dream

Special: Glimmer / Iceberg / Moonbow / Miracle

Passive A: Close Foil / Close Counter / Atk/Res Solo 

Passive B: Vantage 

Passive C: Atk Smoke / Atk/Def Rein / Ground Orders / Guidance / Tactic Skills / Drive Skills / Flexible

Sacred Seal: Atk/Res Solo / Iote’s Shield / Aerobatics / Heavy Blade / Chill Skills / Guidance / Tactic Skills 

• Surprise, surprise — Mirabilis is a dagger-wielder with a respectable Attack stat so, naturally, the common Broadleaf + Vantage sweeper setup merits a mention here, emphasizing her ability to land OHKOs on incoming enemies. It may not be particularly exciting, but it is her best approach for a damage-focused build. A +ATK IV alongside additional sources of Attack boosts are recommended for greatest efficiency.
  • Sidenote: the idea is to use Winter Mirabilis as a complementary damage dealer to assist team efforts to sweep through the opposing forces while keeping Whimsical Dream as a safety option for some support function, but those who want to use her as more of a carry do have the option for replacing it with a standard Assist so that she herself can be refreshed.
• The crux of this set lies in the combination of Broadleaf Fan (which provides a massive damage boost by granting her an attack boost equal to the total number of debuffs on a foe), Vantage, and either Close Foil or Close Counter; this lets Mirabilis her cleanly clear waves upon losing enough HP. Close Foil is generally preferable for its Attack boosts and the common lack of notable dragonstone powerhouses (besides Seiros in Aether Raids during Astra/Anima Season), but Close Counter is still an option too.
  • However, if Near Save support is available, it may be possible to forgo Close Foil/Counter altogether in favor of a standard stat booster like Atk/Res Solo for even more firepower as her melee match-ups become inconsequential.
• Miracle excels as a Special choice here to provide Mirabilis some much-needed survivability since even with Vantage, taking damage isn’t always avoidable; it does necessitate the use of the Heavy Blade seal to access soon enough, however. Should you prefer pure damage boosts, low cooldown options like Glimmer and Moonbow are ideal.  
• Atk Smoke or Spd Smoke are great C skill and Sacred Seal candidates for enhanced Broadleaf damage; keep in mind that daggers automatically have Def Smoke and Res Smoke built-in, so they are unnecessary. Pulse Smoke is a powerful C skill if you commonly run across Infantry Pulse compositions in Aether Raids Offense, as this helps essentially neuter most of their effectiveness. Otherwise, you can simply slot in Mirabilis’ standard support C slot options if none of these catch your attention. 
• Lastly, for her Sacred Seal, the Iote’s Shield deserves a special mention to help mitigate her weakness to archers who may otherwise pose too much of a risk for her to safely carry out her gameplan.