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Eirin Yagokoro

Element Type Chart

Gengetsu
Expand
Gengetsu (a Touhou LW original) refers to an optical phenomenon where two bright spots of light appear in the sky on either side of the moon, caused by the moonlight refracting through ice crystals suspended in thin clouds. These bright spots are called moon dogs. This illusory moonlight is an apt temperament for Eirin, who once created a fake full moon in the night sky. Eirin is endowed with Fire Phase, as her medicine is effective yet bitter, and Moon Essence, with her vast intellect.

The formless and passionate Fire Phase resists Wood Phase, because wood feeds fire, but it is weak to Water Phase, because water dampens fire.

The cooperative and indecisive Moon Essence resists the alluring and arrogant Sun Essence, but it is weak to the diverse and uncooperative Star Essence.
sun_weak
Sun
moon_neutral
Moon
fire_neutral
Fire
water_strong
Water
wood_weak
Wood
metal_neutral
Metal
earth_neutral
Earth
star_strong
Star

Character Shots

Arrow Siege
Solo Vector Bullet x6 Yin
Solo Anti-Moon Defensive Arrow x2 Yang 1
Solo High Vector Bullet x2 Yin 2
Solo Anti-Moon Guardian Arrow x3 Yang 3
Solo Vector Maneuver Bullet x3 Yin 3
Solo Anti-Moon Defiance Arrow x3 Yang 3
[Attack] Target's CRIT Evasion DOWN Sharp Bullet.
[Bullet Layout] Mostly Yin.
[Boost] Moon Rabbit & Moon Enemy & Lunarian-Killer Bullet.
Info
Eirin Yagokoro's Spread Shot (a Touhou LW original). She traps her target in a circle of advancing bullets. Eirin is only a pharmacist at Eientei, but on the moon she was a sage. Her Brain of the Moon epithet marks her out as special even amongst the other Sages of the Moon. It is believed that she was in charge of the Lunar Capital's policies and military strategy.
Bullet Pow Hit Crit
1 2.89 85% 10%
2 3.47 85% 10%
3 4.04 85% 10%
4 3.08 85% 10%
5 3.47 85% 10%
6 3.85 85% 10%
Bullet Description
1 Yin/No-Element Sharp Bullet. May lower target's CRIT Evasion by 1 level.
2 Yang/No-Element Sharp Bullet. May lower target's CRIT Evasion by 1 level.
3 Yin/No-Element Sharp Bullet.
4 Yang/No-Element Sharp Bullet.
5 Yin/No-Element Sharp Bullet. Effective against moon rabbits, moon enemies, and Lunarians.
6 Yang/No-Element Sharp Bullet. Effective against moon rabbits, moon enemies, and Lunarians.
Level Power Rate
1 104
2 109
3 113
4 118
5 122
1018012
All Energy Net x4 Yang
All Lightning Rod x1 Yin 1
All Dense Energy Net x2 Yang 2
All Lightning Rod Arrow x2 Yin 3
All Concentrated Energy Net x2 Yang 3
All Lightning Net x2 Yin 3
[Attack] Charged Energy Bullet.
[Bullet Layout] Mostly Yang.
[Boost] Moon Rabbit & Moon Enemy & Lunarian-Killer Bullet/Wood Charged Bullet.
Info
Eirin Yagokoro's Focus Shot (a Touhou LW original). A net of lightning as fine as a spider's web rains down on her targets. Eirin can create even rare natural phenomena whenever she wants, wherever she wants... This god-like power is apparently relatively commonplace in the Lunar Capital. These powers are made possible through the use of precise and delicate instruments and mechanisms. Perhaps Eirin's bow is what gives her this power...
Bullet Pow Hit Crit
1 4.81 85% 10%
2 7.7 85% 10%
3 4.49 85% 10%
4 5.13 85% 10%
5 5.78 85% 10%
6 6.42 85% 10%
Bullet Description
1 Yang/No-Element Energy Bullet. May inflict Barrier Status: Paralyze to target.
2 Yin/No-Element Energy Bullet. Effective against moon rabbits, moon enemies, and Lunarians.
3 Yang/No-Element Energy Bullet.
4 Yin/No-Element Energy Bullet. Effective against moon rabbits, moon enemies, and Lunarians.
5 Yang/No-Element Energy Bullet.
6 Yin/Wood Energy Bullet. May inflict Barrier Status: Paralyze to target.
Level Power Rate
1 106
2 112
3 118
4 124
5 130

Character Spell Cards

Available
Available
Limit Break 1
Limit Break 2
Limit Break 3
1018a
All Curse of the Heavens Arrow x11 Yin
All Anti-Moon Offensive Arrow x2 Yang 1
All Forbidden Arrow x2 Yin 2
All Forbidden Magic Arrow x2 Yang 3
All Anti-Moon War Arrow x2 Yin 3
All Taboo Arrow x2 Yang 3
Curse of the Heavens: Apollo 13
[Pre-Attack] Own Spirit Power UP.
[Attack] Moon Sharp Bullet.
[Bullet Layout] Mostly Yin.
[Boost] Moon Rabbit & Lunarian-Killer Bullet/Moon Enemy-Killer Bullet/Moon Multi-Killer Bullet/Multi-Killer Bullet.
[Post-Attack] Inflicts Barrier Status: Poison to all targets.
Bullet Info
Eirin Yagokoro's Spell Card. She attacks with a foreboding curse. In the outside world, there was a mission to land on the moon that failed. It is said that the Lunarians know why...
Bullet Pow Hit Crit
1 3.36 85% 10%
2 7.39 85% 10%
3 8.62 85% 10%
4 9.86 85% 10%
5 11.09 85% 10%
6 12.32 85% 10%
Bullet Description
1 Yin/Moon Sharp Bullet.
2 Yang/No-Element Sharp Bullet. Effective against moon rabbits & Lunarians.
3 Yin/No-Element Sharp Bullet. Effective against moon enemies.
4 Yang/No-Element Sharp Bullet.
5 Yin/Moon Sharp Bullet. Effective against moon rabbits, moon enemies, and Lunarians.
6 Yang/No-Element Sharp Bullet. Effective against moon rabbits, moon enemies, and Lunarians.
Level Power Rate
1 100
2 107
3 113
4 120
5 126
Own Spirit Power 20 Up. [Additional effect +0 with success rate 0%.]
Effect Info
Card Level 1 2 3 4 5
Value 10 12 14 16 20
Rate 0 0 0 0 0
Add 0 0 0 0 0
Inflicts 2 layer(s) of Barrier Status: Poison to all targets (2 turns). [Additional effect +1 with success rate 60%.]
Effect Info
Card Level 1 2 3 4 5
Value 1 1 2 2 2
Rate 0 50 0 30 60
Add 0 1 0 1 1
1018b
Solo Stem Cell Bullet x7 Yang
Solo Birth Bullet x2 Yin 1
Solo Survival Bullet x2 Yang 2
Solo Overpopulation Bullet x2 Yin 3
Solo Next-Generation Cell Bullet x2 Yang 3
Solo Underpopulation Bullet x2 Yin 3
Revival: Seimei Yuugi -Life Game-
[Pre-Attack] Adds 1 layer to party's Barrier.
[Attack] Moon Piercing Light Bullet.
[Bullet Layout] Mostly Yang.
[Boost] Piercing Bullet/Sure-Hit Bullet/Multi-Killer Bullet/Moon Sure-Hit Multi-Killer Bullet.
Bullet Info
Eirin Yagokoro's Spell Card. She attacks by creating an array of cells and leading them to extinction. Life games are a simplified simulation of a group of life forms and could be interpreted as a metaphor for the highly regulated society of the Lunar Capital. However, the dwellers of the Lunar Capital have extended their lives to where death is no longer an issue, so perhaps they have already broken the rules of the game...
Bullet Pow Hit Crit
1 7.92 85% 10%
2 11.09 85% 10%
3 12.94 85% 10%
4 14.79 85% 10%
5 16.63 85% 10%
6 18.48 85% 10%
Bullet Description
1 Yang/Moon Light Bullet. Pierces target's DEF.
2 Yin/No-Element Light Bullet. Pierces target's DEF.
3 Yang/No-Element Light Bullet.
4 Yin/No-Element Light Bullet. Always hits regardless of Accuracy stat.
5 Yang/No-Element Light Bullet. Effective against moon rabbits, moon enemies, and Lunarians.
6 Yin/Moon Light Bullet. Always hits regardless of Accuracy stat. Effective against moon rabbits, moon enemies, and Lunarians.
Level Power Rate
1 100
2 107
3 113
4 120
5 126
Adds 1 layer(s) to party's Barrier. [Additional effect +0 with success rate 0%.]
Effect Info
Card Level 1 2 3 4 5
Value 1 1 1 1 1
Rate 0 0 0 0 0
Add 0 0 0 0 0
1018c
All Electric Surveillance Net x15 Yin
All Anti-Moon Defensive Laser x2 Yang 1
All Electric Communications Net x2 Yang 2
All Anti-Moon Offensive Laser x2 Yang 3
All Electric Analysis Laser x2 Yang 3
All Electric Capture Net x2 Yin 3
Heaven Spider's Butterfly-Catching Web
[Pre-Attack] Adds 1 layer to party's Barrier/Own Yang ATK/Yin ATK UP.
[Attack] Moon Multi-Killer Laser Bullet.
[Bullet Layout] Mostly Yin.
[Boost] Piercing Bullet/Multi-Killer Bullet/Moon Impact Multi-Killer Bullet.
Bullet Info
Eirin Yagokoro's Last Word. She weaves a web of light in the sky, preventing her targets from escaping. An ancient Chinese philosopher once said, "Heaven's net casts wide. Though its meshes are coarse, nothing slips through." Heaven's net is like the strict regulation over the Lunar Capital society, where all sins are laid bare and no evil escapes. This society could be considered a realization of the axiom "the greatest happiness of the greatest number is the measure of right and wrong." This Last Word may have some connection to how the moon emissaries' primary mission is to survey and monitor the earth, which now includes observing Eirin, who was once an observer herself.
Bullet Pow Hit Crit
1 6.16 85% 10%
2 18.48 85% 10%
3 21.56 85% 10%
4 24.64 85% 10%
5 27.72 85% 10%
6 30.8 85% 10%
Bullet Description
1 Yin/Moon Laser Bullet. Effective against moon rabbits, moon enemies, and Lunarians.
2 Yang/No-Element Laser Bullet. Pierces target's DEF.
3 Yang/Moon Laser Bullet. Effective against moon rabbits, moon enemies, and Lunarians.
4 Yang/No-Element Laser Bullet. Pierces target's DEF.
5 Yang/No-Element Laser Bullet. Effective against moon rabbits, moon enemies, and Lunarians.
6 Yin/Moon Laser Bullet. May inflict Stun to target. Effective against moon rabbits, moon enemies, and Lunarians.
Level Power Rate
1 100
2 107
3 114
4 122
5 129
Adds 1 layer(s) to party's Barrier. [Additional effect +0 with success rate 0%.]
Effect Info
Card Level 1 2 3 4 5
Value 1 1 1 1 1
Rate 0 0 0 0 0
Add 0 0 0 0 0
Own Yang ATK 5 level(s) UP (1 turn). [Additional effect +0 with success rate 0%.]
Effect Info
Card Level 1 2 3 4 5
Value 1 2 3 4 5
Rate 0 0 0 0 0
Add 0 0 0 0 0
Own Yin ATK 5 level(s) UP (1 turn). [Additional effect +0 with success rate 0%.]
Effect Info
Card Level 1 2 3 4 5
Value 1 2 3 4 5
Rate 0 0 0 0 0
Add 0 0 0 0 0

Character Ability

Capable of making any drug. Natural genius.
Expand
She displays this ability for the people of the Human Village that visit Eientei. She may have only revealed a tiny portion of her many abilities, but this is to maintain the peace that she has attained on the earth. The ability to create medicine supports her daily life with Kaguya and the others. When compounding medicine, she sometimes borrows the abilities of others, as was the case with the Hourai Elixir, which she made by borrowing Kaguya's ability to manipulate eternity. She can also create medicine like The Ultramarine Orb Elixir, which is impossible to make with the technology available on the earth. The regular samples she receives from Medicine Melancholy allow her to develop new experimental drugs. Her knowledge of medicine is not limited to just the formulation of drugs but also extends to medicinal practice, making her a pharmacist and a doctor. She has even been witnessed performing surgery on multiple occasions.
Immune to Barrier Status: Burn & Poison. When attacked with Burn or Poison, Spirit Power 0.20 UP. Immune to Barrier Status: Blind. When attacked with Blind, recovers 5% of own HP.

Character Skills

CD 4
Recovers 30% of party's HP. [Additional effect +0 with success rate 0%.]
Own CRIT Accuracy 2 level(s) UP (2 turns). [Additional effect +0 with success rate 0%.]
Info
Miraculous water that is said to bring back youth. Eirin must have a good relationship with Lord Tsukuyomi if she has this in her possession.
Skill Level 1 2 3 4 5 6 7 8 9 10
Recovers HP
Value 15 16 17 18 20 22 24 26 28 30
Rate 0 0 0 0 0 0 0 0 0 0
Add 0 0 0 0 0 0 0 0 0 0
Critical Accuracy Level Up
Value 1 1 1 1 1 1 1 1 1 2
Rate 0 0 0 0 50 50 50 50 50 0
Add 0 0 0 0 1 1 1 1 1 0
CD 4 4 4 4 4 4 4 4 4 4
CD 6
Own Spirit Power 1 UP. [Additional effect +0 with success rate 0%.]
Own Evasion 2 level(s) UP (2 turns). [Additional effect +0 with success rate 0%.]
Info
The vast intellect of the Brain of the Moon. Is there any being in existence who surpasses her intelligence...?
Skill Level 1 2 3 4 5 6 7 8 9 10
Spirit Power Up
Value 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 1
Rate 0 0 0 0 0 0 0 0 0 0
Add 0 0 0 0 0 0 0 0 0 0
Evasion Level Up
Value 1 1 1 1 1 1 1 1 1 2
Rate 0 0 0 0 50 50 50 50 50 0
Add 0 0 0 0 1 1 1 1 1 0
CD 6 6 6 6 6 6 6 6 6 6
CD 5
Recovers 30% of party's HP. [Additional effect +0 with success rate 0%.]
Own Yin ATK 3 level(s) UP (1 turn). [Additional effect +0 with success rate 0%.]
Inflicts 2 layer(s) of Barrier Status: Poison to self (1 turn). [Additional effect +0 with success rate 0%.]
Info
A miraculous medicine of long life created by refining minerals. However, the same medicine created through Chinese alchemy on earth is said to be poisonous...
Skill Level 1 2 3 4 5 6 7 8 9 10
Recovers HP
Value 15 16 17 18 20 22 24 26 28 30
Rate 0 0 0 0 0 0 0 0 0 0
Add 0 0 0 0 0 0 0 0 0 0
Yin Attack Level Up
Value 2 2 2 2 2 2 2 2 2 3
Rate 0 10 20 30 40 50 60 70 80 0
Add 0 1 1 1 1 1 1 1 1 0
Barrier Poison
Value 1 1 1 1 1 1 1 1 1 2
Rate 0 0 0 0 0 0 0 0 0 0
Add 0 0 0 0 0 0 0 0 0 0
CD 5 5 5 5 5 5 5 5 5 5

Character Characteristics

Panacea Pharmacist
When turn starts, dispels 1 of own Bind or stat debuff. [Success rate 50%.]
Intellectual Study
After being attacked, own Yin ATK 1 level UP (3 turns). [Success rate 50%.]
Fake Full Moon
When turn starts, adds 1 layer to own Barrier. [Success rate 25%.]

Character Change Effect

Power Link
When switching places with a rear-guard unit, other unit's Spirit Power UP.
When switching places with a front-guard unit, front guard's Spirit Power UP.

Upgrade Costs

Rank Coins Materials
0 -> 1 1000
1 -> 2 2,000
2 -> 3 5,000
3 -> 4 10,000
4 -> 5 15,000

Character Analysis

“What a cruel thing to say. I certainly did create this sealed chamber around the Earth.

But, it was for the sake of the princess and [Udongein].”

Eirin Yagokoro, the Brain of the Moon, was once one of the greatest sages the lunarians ever had. It only makes sense - she’s almost certainly Omoikane, a god of wisdom and one of the oldest around. Once, she made the Hourai Elixir for Kaguya, and got the princess stuck in eternal life and exile for it. Out of guilt for her actions, she followed Kaguya to the earth, and later consumed the Hourai Elixir herself. Now having settled down after the actions of Imperishable Night, Eirin serves as Gensokyo’s local pharmacist, using her ability to create any medicine for the betterment of all, at low prices too. The Eirin of old may have never done such a thing, but the Eirin of today is a more altruistic and polite woman - but still one with no tolerance for foolishness, or really anyone who can’t understand what she has to say. That genius is on your side now as an A Tier Friend.

For farming, Eirin’s high values of Yin and Yang ATK Up and her All targeting Last Word are unfortunately somewhat let down by it being 1-1-3, even with her second skill granting her +1 Spirit Power right away. She can certainly farm some stages, especially if she hits a weakness, but just make sure to steer clear of any resistances. 

For harder fights, Eirin’s ability to create medicine isn’t just for show. Between her utterly colossal health pool and access to two 30% healing skills on short cooldowns, combined with Revival: Seimei Yuugi -Life Game- providing the entire party with 1 Barrier every time she uses it, Eirin has healing support in spades. Additionally, Curse of the Heavens: Apollo 13 provides all targets with 2 layers of Poison Barrier for 2 turns, with a 60% chance for 1 more - great Yang support in its own right, or a fantastic chance for a teammate to Anomaly Break them (most notably Medicine Melancholy). She also packs the rare and coveted Power Link, fantastic for giving a teammate some Spirit P right away.

Offensively, Eirin’s far from a slouch either. Her Last Word being 1-1-3 may be a detriment to her farming ability, but it lets her pack a pretty impressive punch in harder fights. Unfortunately its mixed status makes it somewhat harder to support Eirin, but it still hits hard even without support. 

It’s not all great though. Eirin’s Barrier Break ability is rather low, with both of her Spell Cards possessing only Moon breaks, with a very below average amount of 1/1/1/2 for 0/1/2/3 Spirit Power. To an extent, Curse of the Heavens: Apollo 13’s 1 Spirit Power on use mitigates this, but Eirin’s not very good at Barrier Breaks. 

Overall though, Eirin’s definitely a potent healer that any team would be glad to have. Just don’t act foolishly around her, lest you receive a glare and a condescending sigh. 

Here are the chances for Eirin’s secondary effects (per bullet):

Arrow Siege: Chance for CRIT Eva down: 30%/30%/0%/0%/0%/0%

Gold God Web: Chance for Paralyze: 30%/0%/0%/0%/0%/30%

Heaven Spider's Butterfly-Catching Web: Chance for Stun: 0%/0%/0%/0%/0%/60%

Story Card Recommendations

Spell Card

Eirin unfortunately doesn’t have very many great options for Story Cards. If you’re trying to Break with her, she absolutely needs Spirit Power UP due to her second Breaks both being at 3 Power. Otherwise, she ideally wants to use an Accuracy UP Story Card the turn before her Last Word, and a Yang ATK UP 2 turns before it (if possible). For Stat Sticks, look to anything that has both Yang and Yin ATK, preferring Yin.

Last Word

Due to the higher than normal Accuracy of Eirin's Last Word, combined with its heavy amount of Laser, Ordinary Magician is pretty much the best option Eirin has. Any Story Card that grants Laser DMG Up is also a good option, and lastly if you have no Laser DMG Up, any Story Card which provides Accuracy UP will do. If you're farming with Eirin, you may prefer Accuracy UP for consistency.

Character Skill Level Up Recommendations

Firstly, Golden Pill Fragment should be levelled up, as the additional Yin ATK it provides Eirin at level 10 is a great boon - don't fear the self-Poison, Eirin's Character Ability leaves her immune to the downsides. Afterwards, Diluted Ochimizu should get a few quick levels, up to 5 or so, for some quick extra healing. Finally, if you want to use Eirin to farm, prioritize Moon Intellect: otherwise, finish off Diluted Ochimizu and save Moon Intellect for last.

Character Strengths

+Fantastic amount of Healing and Barrier restoration
+Great Poison Barrier support, for either Anomaly Breaks or supporting Yin Attackers
+Last Word can deal a lot of damage if given a turn to set up

Character Weaknesses

-Poor Barrier Break potential
-Backloaded Last Word
-Hard to support