Corrin (M)

Preferred IV: +RES / -HP

• For Corrin, every stat point counts to allow him to maximise his potential as a Chill soaker. Boosting his RES allows Corrin to potentially soak Chill RES if he has the highest RES in the team. HP is picked as the bane as it is almost functionally useless.
• Boosting in RES also enable Corrin to run potent debuff skills to support his allies even further, in which the most noteworthy one being Sabotage skills.

Weapon: Yato (+Eff)

• For this build, it revolves around Corrin’s personal weapon, Yato, and its special refine effect. Yato provides +4 in-combat buffs to the ally that he has ally support on if it is within 2 spaces of Corrin. Using this weapon, the focus would be to provide as much support as possible to that ally.

Assist: Reposition / Preference

Special: Moonbow / Galeforce 

• In Aether Raids, a special with 2 charges is preferred to keep Corrin’s option open as a back-up attacker if required. Moonbow is the natural choice for its consistency.
• For Arena, scoring high should be Corrin’s priority while remaining in his position as a support unit. The choice of special is relatively inconsequential. Nevertheless, Galeforce is probably his best option to potentially allow Corrin to soften up his foes for the bonus unit to engage in combat.

Passive A: Fury 4 / Fury 3 / Fort Def Res 3 / R Duel Infantry

• Due to chills targeting the unit with the highest stats, absorbing chills could be relatively helpful in Aether Raids to lift some burden off the tank’s shoulders.
• Yato’s base effect provides a +2 to all stats, which meant that Corrin’s visible stats is nothing to scoff at despite his status as a launch unit. This synergises very well with skills that boosts Corrin’s visible stats, such as Fury and Fortress DEF RES. 
• For Arena, simply substitute for R Duel Infantry to ensure maximum scoring in arena.

Passive B: Sabotage ATK / Chill ATK / Preference

• Sabotage skills are extremely useful for Corrin if he focuses on improving his visible stat. This is especially relevant in Aether Raids, in which hyper aggressive player phase threats usually could not keep up the visible RES race against Corrin. As Corrin is predominantly positioned defensively along with his ally, debuffing the opponent’s ATK would probably be more useful.
• For budget options, chills are likely the closest substitutes without the stat check.

Passive C: Distant Guard 3 / Close Guard 3 / Drive RES 2

• Due to how Yato requiring him to be within 2 spaces of his ally, combat buffs that works with the same confines are the most synergistic. Distant Guard is useful for the common ranged threats in Aether Raids, while Drive RES is the budget option as most relevant ranged threats are mages. 
• For Arena, it is the reverse; most threats are melee. As such, Close Guard is likely the best candidate.

Sacred Seal: Drive RES 2 / Drive DEF 2 / Fortress RES 3

• The choice of seal depends on team composition. For additional support, running an extra Drive, such as Drive RES 2 and Drive DEF could potentially provide additional support.
• If players needs an extra push to help absorbing Chill RES or Sabotage support, running Fortress RES 3 could be helpful.

Preferred IV: +RES or +ATK / -HP

• +RES is probably the go-to asset for players who wishes to use Corrin as the main tank to ensure Corrin could take hits from a myriad of threats. This is especially relevant in Aether Raids, in which plenty of the player phase threats are magical in nature.
• Some might want to take an asset in ATK instead if players require the additional boost to finish the opponent in a single battle. 

Weapon: Yato (+RES)

• For melee refines, defensive stats provides the most returns by giving +4 instead of +3 SPD and +2 ATK. As Corrin usually needs the most help in RES, picking the RES refine Yato is likely his best option as an enemy phase tank. 

Assist: Reposition / Preference

Special: Sol / Noontime 

• The role as a main enemy phase tank meant Corrin has to potentially fight multiple battles. Topping up his HP during battle increases his survivability and enables Corrin to do just that. 
• Sol is likely to be the most effective, as he could activate Sol in his second fight, which is ideal as he could absorb more HP from the special. While Noontime is a viable option, the effective healing is not as high as Sol, as Corrin could only heal off his foe’s health on his second hit if he follows up. 

Passive A: Distant Counter

• The bread and butter of a build that focuses on Enemy Phase; it allows Corrin to counter units regardless of distance.

Passive B: Null C Disrupt / Null Follow-Up / Dull Ranged

• Null C Disrupt provides a safety net for Corrin to fight against units that prevents counterattacks, such as Firesweep weapons and Dazzling Staff.
• Null Follow-Up is a possible alternative as an alternate tank if a player already has a designated Null C Disrupt Tank.
• Dull Ranged is likely Corrin's budget option to check against mages that rely on visible buffs, such as the Blade tomes.

Passive C: Pulse Smoke 3 / Panic Ploy 3 / ATK Smoke 3

• Pulse Smoke is the premium option for any enemy phase tank by almost completely disabling teams that revolves around Infantry Pulse, which reduces the amount of damage Corrin could take by a significant amount. However, requiring Corrin to be in close quarters against his foes could be a problem. ATK Smoke is a decent cheaper alternative for such a playstyle.
• Panic Ploy offers a different proposition for Corrin, as he could inflict his debuff from afar. This could also be used to manipulate Restores, or specifically target a particular unit that could cause problems for Corrin.

Sacred Seal: Quick Riposte 3 / Distant DEF 3

• Sturdy or Mirror Impact could potentially cause Corrin problems due to it negating follow ups. Quick Riposte 3 is a soft counter to such skills to at least allow Corrin to follow up if he wins the speed check. 
• Distant DEF 3 naturally improves his survivability against ranged threats, which are probably the most common in Aether Raids.