Halloween Corrin (F)

Weapon: Moonlight Stone

Assist: Positional Assist / Flexible

Special: Negating Fang 

IVs: +Atk or +Spd / -Res

Passive A: Atk/Spd Finish 4

Passive B: Dragon’s Wrath 4

Passive C: Joint Drive Atk / Atk/Spd Oath 4 / Flexible

Sacred Seal: Null Follow-Up / Atk/Spd Form / Mystic Boost / Flexible

• Corrin’s base kit gives her almost all the tools she needs to be an extremely dominant unit. There is little reason to switch out most of her skills, with the possible exception of the C skill, and adding an assist and seal. 
• This set is best used to tank melee units when paired with a unit using a skill like A/R Far Save to cover ranged threats, or used in cases where there are no threatening ranged units. 
• Moonlight Stone charges Negating Fang fully at the start of turn 1, allowing Corrin to activate it immediately the first time she takes an attack in combat, reducing the damage by 30% and an additional 8 from Moonlight Stone, and empowering her next attack by 30% of her Atk stat. 
• The ideal boon is arguably +Atk to make her counterattack as strong as possible, but +Spd is also a great choice against units she can’t KO in one hit, such as Brave Seliph with his Miracle effect. Giving Corrin enough Spd to ensure she can follow-up against these foes is valuable. -Res is arguably the best bane, as most melee foes target Def. 
• Atk/Spd Finish 4 provides a great boost of +7 Atk and Spd so long as Corrin is within 3 spaces of one ally, a very easy condition to meet most of the time. In addition, once her Special activates, it boosts the damage of her subsequent attacks by 5 and heals her by 7 HP per hit. This provides a fantastic boost to Spd and damage overall, and the healing synergizes very nicely with the reduced damage from Negating Fang, allowing Corrin to heal herself up to more easily survive the next combat. 
• Dragon’s Wrath 4 provides a great effect, reducing Corrin’s damage taken from the first hit in combat by 25% and increasing the damage of her first attack by 25% of the difference between her Atk and her foe’s Res. There is little reason to replace this with another skill in most cases. 
• The C skill is flexible. Joint Drive Atk provides a reliable boost of +4 Atk in combat as long as there is at least one ally within 2 spaces, as well as boosting those nearby allies’ Atk by 4 in combat. It can be replaced with other useful options like Atk/Spd Oath 4 to allow Corrin to buff her own Atk and Spd at the start of her turn, while providing a +3 boost to both stats in combat if she is within 2 spaces of an ally. Other skills like Fatal Smoke or Pulse Smoke are also good in particular cases. 
• Null Follow-Up is a strong choice of seal overall, allowing Corrin to use her fantastic Spd stat to follow-up and deny follow-up attacks from slower foes. A stat boosting seal like Atk/Spd Form is also a great option, boosting Corrin’s Atk and Spd by up to 7 if there are three allies within two spaces. Mystic Boost can also provide some extra healing after combat, giving Corrin better survivability over multiple engagements. It also makes her more resistant to adaptive damage effects and staves, but those effects are usually not important. 

Weapon: Moonlight Stone

Assist: Positional Assist / Flexible

Special: Negating Fang 

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

Passive A: Atk/Spd Finish 4

Passive B: Dragon’s Wrath 4

Passive C: Joint Drive Atk / Atk/Spd Oath 4 / Flexible

Sacred Seal: Dist. Counter (D)

• This build is very similar to the last, with the exception that it is focused on counterattacking all ranges of foes. It uses the Dist. Counter (D) seal to accomplish this. 
• Atk and Spd are still great choices of boon, with Atk being arguably the best. Either Def or Res are good choices of bane, as Corrin relies on both her Def and her Res to survive hits from ranged foes. Since she has multiple sources of percentage-based damage reduction with Negating Fang and Dragon’s Wrath 4, Def and Res reduce her damage taken by less than 1 point of HP per point of Def/Res under most circumstances, so an HP bane is not the best choice.