Scion Larcei

Weapon: Whirling Grace

Assist: Positional Assist / flexible

Special: Regnal Astra / Noontime

IVs: +Spd or +Atk / -Def or -Res

Passive A: Atk/Spd Boosting A Slot / Distant Counter / Spd/Def Solo

Passive B: Spurn / Frenzy

Passive C: Joint Drive Atk / flexible

Sacred Seal: Atk/Spd Solo / Mystic Boost / flexible

• Larcei’s Whirling Grace, unit type, and statline make her a great choice for a “tank”-style enemy or mixed phase build. 
• The choice of Special depends on whether the player desires more damage or some healing. Regnal Astra is a fantastic low-cooldown option for damage that Larcei can activate on her second attack in almost any combat. If healing is preferred, Noontime is a solid choice. 
• The ideal boon is generally +Spd to improve Larcei’s ability to follow-up, avoid follow-ups, damage reduction from Frenzy or Spurn, and damage from Regnal Astra. +Atk is a decent substitute that will increase her damage. The ideal bane is -Def or -Res; -HP is generally inferior to both due to the damage reduction reducing the impact that Def and Res have on Larcei’s actual damage taken against most foes. 
• The A skill depends on the context in which Larcei will be used. If she is used as a solo tank, intended to fight every kind of enemy, then Distant Counter lets her retaliate against ranged foes. If she is used in a context where this is not necessary, such as with an armored unit with A/R Far Save, then another A skill can be used to boost her stats, such as Atk/Spd Solo or her native Spd/Def Solo 4. 
• The ideal B skill is arguably Spurn for its combination of Spd-based damage reduction and +5 damage on Special activation. Frenzy is also a good choice, as while the Desperation 2 effect is worthless on enemy phase, it may come in handy if Larcei needs to clean up units on player phase afterwards. 
• The C skill is flexible, with Joint Drive Atk being a good option that increases Larcei’s Atk by 4 so long as an ally is within 2 spaces, as well as increasing those allies’ Atk by 4. An option like Pulse Smoke could be used to prevent enemy Special activation if Larcei can apply the Smoke before combat, or Time’s Pulse to immediately charge Regnal Astra at the beginning of Larcei’s turn. 
• The seal is flexible, with good options like Atk/Spd Solo for increasing Larcei’s two most important stats, or Mystic Boost providing healing and disabling the Wrathful Staff effect of her foes. 

Weapon: Whirling Grace

Assist: Positional Assist / flexible

Special: Regnal Astra / Galeforce

IVs: +Spd or +Atk / -Def or -Res or -HP

Passive A: Atk/Spd Boosting A Slot / Flashing Blade

Passive B: Frenzy / Spurn

Passive C: Odd Tempest / Joint Drive Atk / flexible

Sacred Seal: Blade Session / Flashing Blade / flexible

• Larcei can opt for a more player phase-focused build to deal high damage with Regnal Astra or activate Galeforce and act a second time. 
• If Galeforce is used, then Flashing Blade is a good choice of A or S skill (but not both, they don’t stack) so that Larcei can activate Galeforce after two attacks. If Regnal Astra is used, Flashing Blade is not necessary and it is better to choose skills to improve her Atk and Spd, like Atk/Spd Solo or Blade Session. 
• The ideal boon is generally +Spd to improve Larcei’s ability to follow-up, avoid follow-ups, damage reduction from Frenzy or Spurn, and damage from Regnal Astra. +Atk is a decent substitute that will increase her damage. Any of -Def, -Res, and-HP are a fine choice of bane, as Larcei’s bulk is not that important for this kind of build. 
• Frenzy is a great B skill for this kind of build, as it reduces Larcei’s damage taken by 40% if her Spd is at least 10 higher than her foe’s, as well as allowing her to follow-up before her foe can counter if her HP is below 50%. These effects together help her survive across many combats. Spurn can be used instead for damage reduction if the extra 5 damage on Special activation is desired, but this is an inferior option if using Galeforce as there is no in-combat activation to add damage to. 
• The C skill is flexible. Odd Tempest or Even Tempest bestow the March status on odd and even-numbered turns, respectively, increasing Larcei’s Mov by 1 on those turns. This can be very useful for initiating combat depending on context. Her native Joint Drive Atk is also a good option that increases her Atk by 4 so long as she is within 2 spaces of an ally, as well as increasing the Atk of any allies within 2 spaces by 4.