Table of Contents
| MATK | 165 |
| HP | 4368 |
| MRES | - |
| CR | 10% |
| CDMG | 50% |
Seir is a Magic 
Dark Tank with massive amounts of damage reduction and self-healing, which combined makes her able to mitigate most damage in the game. She is also able to grant utility when she is hit, such as SP and DMG buffs.
Check out my other Character Guides:
Strengths and Weaknesses
＋New Hire's damage buff is perfect for longer content with enemies that hit a lot.
＋Seir's damage reduction and healing makes her practically immune to regular damage and makes shred effects negligible against her.
＋Seir has the cheapest taunt in the game.
－Seir's damage reduction folds to fixed and pure damage. This can be mitigated by B-Rank Idol's energy guard.
－[PvP] Seir is not as good as other tanks because she has no elemental resistance while also being vulnerable to Justia.
Costumes
Seir currently has three costumes, each of which trigger effects when Seir is hit. Demon's Daughter heals her, B-Rank Idol grants SP, while New Hire grants a stackable DMG buff. Her first two costumes also have damage reduction effects.
Demon's Daughter
Me
Protective Instinct
SP ◆ 4 — CD ● 5 Turns
Heal HP based off of 15% of Max HP when you get attacked for 4 turns. Decrease incoming DMG by 40% for 4 turns.
Skill Potential 1
SP Cost -1
Skill Potential 2
Damage Reduction +15%
Skill Potential 3
NEW: Taunt for 4 turns.
| +1 | +2 | +3 | +4 | +5 |
|---|---|---|---|---|
| Damage Reduction | Damage Reduction | SP Cost | Damage Reduction | Heal Duration |
| 40% ▸ 50% | 50% ▸ 60% | 4 ▸ 3 | 60% ▸ 70% | 15% ▸ 30% 4 ▸ 6 |
Demon's Daughter is recruitable in the pub's rotating pool, and in Infinite Reroll.
This costume gives Seir a hefty damage reduction buff. At +0, the 40% reduction nearly doubles her health, but once she's upgraded, she can nearly multiply her health effectively ten-fold (with a total of 85% damage reduction). Damage reduction stacks multiplicatively with DEF and MRES, so Seir will pretty much be taking double digit damage at this point. More importantly, this damage reduction protects Seir from DEF and MRES shredding enemies that can still kill your units with 90 RES.
This skill also gives Seir the ability to heal herself whenever she gets hit. When compounded with the damage reduction, Seir is pretty much invincible so long as she doesn't get one shot (for example, by fixed or pure damage).
In terms of upgrades, the most important one is skill potential 3, which gives Seir the ability to taunt enemies. This is important for protecting her allies, as well as enabling her to trigger her other skills' effects. The SP upgrades can reduce her skill cost to 2 SP, making it the cheapest taunt in the game. The DMG Reduction is busted at 85%, but 65% should be comfortable enough for her (+1 with Skill Potential 2).
At +5, Seir gets an upgrade to her heal multiplier and her buff duration. However, heals crit in this game, so 15% is already more than enough considering her damage reduction, and the buff duration increase doesn't apply to her taunt. So, while it's nice to have, B-Rank Idol can cover the gap to make her damage reduction full uptime.
Key Upgrades: Skill Potential 3, SP Upgrades, Damage Reduction upgrades scale really well.
B-Rank Idol
Me
He is Bullying Me!
SP ◆ 2 — CD ● 5 Turns
Acquire 2 SP when you get attacked for 2 turns. Decrease incoming DMG by 40% for 2 turns.
Skill Potential 1
Damage Reduction +15%
Skill Potential 2
SP Gain Duration +2 Turns
Skill Potential 3
NEW: Create an Energy Guard equal to 100% of Max HP.
| +1 | +2 | +3 | +4 | +5 |
|---|---|---|---|---|
| Damage Reduction | SP Gain | SP Cost | Damage Reduction | Damage Reduction |
| 40% ▸ 50% | 2 SP ▸ 3 SP | 2 ▸ 1 | 50% ▸ 60% | 60% ▸ 70% |
B-Rank Idol also gives Seir 40%-85% damage reduction, so the points about it in Demon's Daughter also apply here.
Besides that, this skill is pretty niche. It competes with her other skills which are more important, and SP generation isn't really necessary in a lot of content. The best use case of this effect is to mitigate enemies that drain SP, and that's if you can't kill those enemies for some reason.
On the other hand, the energy guard from skill potential 3 can mitigate one of Seir's weaknesses, which is her vulnerability to fixed and pure damage. Up to extra 20,000 HP can help her survive these hits.
Key Upgrades: Skill Potential 3, Damage Reduction scales really well.
New Hire
Me
P-please Sign the Contract!
SP ◆ 3 — CD ● 7 Turns
For 4 Turns, each time you are hit, all allies' DMG Dealt increases by 10% for 6 turns. Each hit adds 1 stack, up to a maximum of 99 stacks.
Skill Potential 1
Cooldown -2 Turns
Skill Potential 2
DMG Buff Duration +2 Turns
Skill Potential 3
SP Cost -1
| +1 | +2 | +3 | +4 | +5 |
|---|---|---|---|---|
| DMG Buff | DMG Buff | DMG Buff | DMG Buff | DMG Buff |
| 10% ▸ 12% | 12% ▸ 15% | 15% ▸ 17% | 17% ▸ 20% | 20% ▸ 22% |
This is Seir's most important costume, being the only one that directly contributes to the damage of your team. Seir is for the most part not worth building if you do not have this costume.
The buff being stackable means that Seir is a great buffer in longer content, where the enemy attacks with a lot of hits. Fiend Hunt and Guild Raids being the prime examples. Comparing her to units that apply vulnerability, Seir becomes a great buffer after getting hit at least 5 times (7 times if she's +2). After that, the sky's the limit with her.
Do keep in mind that Seir does not want to be dispelled, or she'll lose her ability to grant buffs.
Key Upgrades: All skill potentials, DMG Buff upgrades add up.
Building Seir
You'll need to build Seir defensively if you want her to be able to take hits to buff the team.
Arch Demons
Exclusive Stat — 54% HP
Correct Main Stats — CR + HP%
Great for Seir's survivability, but since Seir struggles in PvP content, this stat boost isn't often relevant.
Engraving: LIF
243 HP
Engraving: STR
34 MATK
Engraving: PSV
8% MRES
Awakening 1
4% MRES
Awakening 2
14% HP%
Bond Potential
♦ Several bond nodes are locked behind a skill potential.
| HP | 62.4% |
| DEF | 13.4% |
| - | - |
| HP | 62.4% |
| MRES | 13.4% |
| - | - |
| HP | 564 |
| MATK | 22 |
| MRES | 8.4% |
Either Demon's Daughter or B-Rank Idol are great for Seir, since their stats are fully defensive. However, do keep in mind that some of Demon's Daughter's DEF bonds are locked behind a tear upgrade.
Tank Build [PvE]
＋
or
＋
Substats — HP%, MRES, DEF
Build either full DEF or full MRES depending on the enemies you're facing. Do keep in mind that healing crits in this game, which is why Seir builds crit rate on her accessory and gloves.
