Idunn

Preferred IV: +ATK or +DEF or +RES

• Assets in either Attack, Defense, or Resistance grant Idunn additional power and survivability

Weapon: Demonic Breath (+Eff)

Assist: Positional Assist

Special: Sacred Cowl / Aegis / Glimmer

• Sacred Cowl and Aegis are both very effective for increasing Idunn’s survivability by reducing foe’s damage when attacking her (including those that would normally bypass damage reduction such as Lethality). 
  • These skills are most typically run alongside Hardy Fighter and choice between the two is dependent on what you are trying to protect against. Unlike Sacred Cowl, Aegis is not instantly charged but brought down to a cooldown of 1. However, this can pair well with her weapon refinement since it already reduces the first hit by 70%. 
• Glimmer is your standard choice for a damaging Special that you can instantly retaliate with.

Passive A: Distant Defense 4 / Distant Counter skills / Svalinn Shield

• Distant Defense 4 grants the most significant stat boost against ranged opponents as well as nullifying their field buffs during combat.
• Distant Counter skills such as Distant Ward allow Idunn to actually counterattack against ranged opponents, preventing them from safely attacking her.
  • Outside of Summoner’s Duels, this is generally the ideal skill to run with Far Save.
• At the cost of any stat boost, Svalinn Shield is a useful check against specific powerful units who have armor-effective damage in their weapons.

Passive B: Hardy Fighter / Dragon Wall / Crafty Fighter / Vengeful Fighter

• Hardy Fighter is the choice skill for defensive Specials by giving them an instant 2 charge at the start of turn 1 as well as preventing foe’s skills that guarantee follow-up attacks.
• Crafty Fighter is a solid general use option by providing a guaranteed follow-up attack as well as the effect of Guard.

Passive C: Far Save skills

Sacred Seal:  Deflect Magic/Missile / Form Skills / Warding Breath

• Deflect skills act as a safety net against consecutive attacks from brave weapons or when simply not being able to counterattack against ranged opponents.
  • This pairs naturally well with Idunn’s weapon refinement, as the first hit of any opponent that can double her will be reduced by 70% while any additional hits will be reduced by 80% making her almost impossible to break without any form of DR nullification skills. 
• Any choice of Sacred Seal that boosts key stats such as Atk/Res Form also makes for a suitable option.
• Breath Skills such as Warding Breath grant Idunn Special acceleration per attack during combat. This is particularly effective when run alongside Distant Counter skills as it allows Specials such as Sacred Cowl to be reactivated on her counterattack. 

Preferred IV: +ATK or +DEF 

Weapon: Demonic Breath (+Eff)

Assist: Positional Assist

Special: Ignis / Glimmer / Pavise

• Ignis and Glimmer can both make for effective damage Specials depending on the scenario. Idunn retaliates with Glimmer instantly but with much lower firepower while Ignis has a much greater chance of finishing off the opponent but demands more than one attack during combat which might conflict with Idunn’s weapon.
• Pavise does not deal damage but protects Idunn when being doubled as it can be active following the 70% from Demonic Breath when the foe does their follow-up attack.

Passive A: Close Defense 4 / Stance Skills / Ideal Skills

Passive B: Crafty Fighter / Wily Fighter / Vengeful Fighter

• All of the following A skills provide stats boosts and all of the following fighter skills grant a guaranteed follow-up. The ones that you will want to run will be those that do not have secondary effects that conflict with each-other.
  • [X] Close Defense 4 and Wily Fighter both nullify the opponent’s field buffs
  • [X] Stance Skills and Crafty Fighter both have the Guard effect
  • [I] Ideal skills do not conflict with either Fighter skills but also do not have their own secondary effect 
  • [I] Vengeful Fighter is a cheap B skill option that does not conflict with any of the aforementioned A slots but is redundant with a Breath skill in the Sacred Seal slot

Passive C: Near Save skills

Sacred Seal: Steady Breath / Form Skills 

• Steady Breath is especially important with this build for making sure that Idunn can make efficient use of her Special during combat granted no other source of acceleration.
• Form Skills such as Atk/Def Form remain a solid Sacred Seal option for pure stats.