Ascended Eir

Weapon: Ymir, Everliving 

Assist: Positional Assist 

Special: Moonbow / Ruptured Sky 

Passive A: Atk/Spd Catch 4 

Passive B: Mystic Boost 4

Passive C: Atk/Spd Menace / Spd Smoke / Flexible 

Sacred Seal: Atk/Spd Solo / Blade Session

• Boasting fantastic damage output through her 42/45 offenses, -1 Special cooldown, +5 to all stats, and an Atk buff = 40% of the current HP of the ally with the second-lowest HP, Eir is a remarkably potent offensive force. While most Player Phase units suffer from low bulk, Eir circumvents this through Ymir, Everliving’s Miracle effect, allowing her to survive a lethal attack once per combat if her HP prior to the attack is > 1 and her HP at the start of combat is ≥ 25%.
  • Mystic Boost 4, Eir’s native B slot, synergizes perfectly with this condition, as it heals her for 10 HP after every combat. As long as Eir does not receive two lethal counterattacks in one combat, she will survive combat, making her very reliable.
• Low-cooldown Specials such as Moonbow and Ruptured Sky are strong choices as always, as they enable higher damage for Eir at a very frequent rate even if the enemy cannot counterattack. She also lacks additional Special charge, so the more enemies that have Guard effects, the more valuable low-cooldown Specials are relative to high-cooldown Specials. If the enemy can counterattack and no Guard effect is active, however, Luna and Draconic Aura are strong choices that Eir can activate on her follow-up attack.
• Eir’s native Atk/Spd Catch is a fantastic A slot, granting up to +9 Atk/Spd if the enemy’s HP is at 100% and they have a visible debuff (+7 if only one condition is met). Given that daggers inflict -7 Def/Res on enemies within two spaces of the target after combat, Eir can consistently gain the full +9 Atk/Spd to bolster her damage.
• Inflicting -6 Atk/Spd on the nearest enemies within four spaces and granting +6 Atk/Spd to Eir if any enemies are within four spaces at the start of the turn, Atk/Spd Menace is a great choice for improving Eir’s offenses and enabling her to receive the full +9 Atk/Spd from Atk/Spd Catch without relying on allies. A cheaper, but strong alternative to ensure follow-up attacks is Spd Smoke, which inflicts -7 Spd on enemies within two spaces after combat.
• With Eir’s Cavalry status granting her superior range, Atk/Spd Solo is an even stronger choice than it already is for non-Cavalry units, granting +6 Atk/Spd during combat if Eir is not adjacent to an ally. Alternatively, she can use Blade Session, which grants +3, +6, or +9 Atk/Spd during combat depending on how many allies have already acted (zero, one, or two respectively).

Weapon: Ymir, Everliving 

Assist: Assistless / Rally Assist 

Special: Draconic Aura / Lethality 

Passive A: Atk/Spd Catch 4 / Atk/Def Catch 4 / AR-D Atk/Spd (3 or 4) / AR-D Atk/Def (3 or 4) 

Passive B: Guard / Sweep Skills

Passive C: Blue Feud / C Feud / Flexible

Sacred Seal: Atk/Spd Solo / Atk/Def Catch 

• The combination of 42/45 offenses and Ymir, Everliving’s potentially staggering damage boosts makes Eir a strong choice for Aether Raids Defense, in which she serves the seemingly simple role of a physical, high-mobility ranged nuke. However, Ymir, Everliving also has a defensive property: if Eir’s HP at the start of combat is ≥ 25% and she initiates combat or the enemy is ranged, she gains a once-per-combat Miracle effect that allows her to survive a lethal attack if her HP prior to that attack is > 1.
  • While this effect seems incredibly strong on paper, its strength is limited by Eir’s terrible physical bulk and her lack of access to the defensive half of Null Follow-Up (neutralizes effects that guarantee the enemy’s follow-up). If an enemy with a guaranteed follow-up expends Eir’s Miracle effect on their first counterattack, then she needs to KO them on her follow-up attack in order to survive.
• This set is split into two subsets: traditional and Def-stacking, with the former seeking to maximize Eir’s Atk/Spd and the latter seeking to maximize Eir’s Atk/Def so that she can more consistently survive against enemies with guaranteed follow-ups. Weapon aside, there are some other passives that apply to both sets:
  • As Ymir, Everliving provides -1 Special cooldown and up to 25 Atk during combat, Draconic Aura is an excellent, consistent source of additional damage that Eir can activate on her follow-up if her Special charge is not slowed. Lethality is an expensive, but strong alternative that pierces non-Special damage reduction and shreds 75% of the enemy’s Def on activation; if Eir’s Special charge is not slowed, the enemy counterattacks, and she survives her first initiation, she can activate Lethality on her subsequent initiation.
  • Guard checks Hardy Fighter by slowing the enemy’s Special charge, preventing them from readying their defensive Special for Eir’s follow-up attack and/or subsequent combats. Alternatively, Windsweep and Watersweep prevent physical and magical enemies respectively from counterattacking, making them solid choices as well (though note the potential anti-synergy with Lethality). Windsweep is particularly strong given Eir’s poor physical bulk and physical Enemy Phase Brave Vantage sweepers that would otherwise drop Eir to 1 HP on their first attack, then KO her on their second consecutive attack.
  • Blue Feud and C Feud disable all supportive skills of Blue and Colorless enemies respectively. Additionally, if Eir is in combat against a Blue or Colorless enemy respectively, then all the support they receive from allies is turned off, regardless of their allies’ color. Given that many of the strongest Enemy Phase units are Blue or Colorless, these are great C slot choices, though Eir’s C slot is ultimately flexible should these skills be unavailable and/or undesirable for players.
• Traditional:
  • IVs: +Atk and/or +Spd, -Def
  • Eir’s native Atk/Spd Catch is fantastic, as it grants +9 Atk/Spd if the enemy’s HP is at 100% and they have a visible debuff (+7 if only one condition is met). Alternatively, AR-D Atk/Spd provides a slightly higher ceiling of +10 Atk/Spd or +11 Atk/Spd depending on whether the third or fourth level of the skill is used, though it comes with the somewhat difficult and inconsistent condition of having several defensive structures intact.
  • While Solo skills can be unreliable in Aether Raids Defense, they are somewhat more reliable for Cavalry units thanks to their superior movement. Using Atk/Spd Solo on Eir for +6 Atk/Spd during combat if she is not adjacent to an ally opens up the Blade Session Sacred Seal for allies that may have more trouble achieving the Solo condition.
• Def-stacking:
  • IVs: +Atk or +Spd if Eir is +0, +Atk and +Spd if Eir is at least +1
  • Note that this subset comes at an opportunity cost, as it invests into Eir’s Def rather than her Spd. As such, it may be more difficult for Eir to perform follow-up attacks or achieve the Sweep Skills’ condition of having more Spd than the enemy.
  • Atk/Def Catch and AR-D Atk/Def function identically to Atk/Spd Catch and AR-D Atk/Spd, just that the former pair buffs Def while the latter pair buffs Spd. Unsurprisingly, Atk/Def Catch is Eir’s best Sacred Seal choice as well, granting smaller, but strong buffs nonetheless of +5 Atk/Def during combat if either Catch condition is met.