Eirin Yagokoro

Brain of the Moon

Stats

Base

Fantasy Rebirth

Health

8400

Agility

850

Yang ATK

1500

Yang DEF

850

Yin ATK

1220

Yin DEF

800

Races

Bamboo Forest of the Lost Eientei Foundational Presence Gensokyo Lunarian Medicine Mistress Moon Emissary Moon-Related Party Person of Hourai Pharmacist Sage Sage of the Moon Servant

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

Moon

Fire

Water

Wood

Metal

Earth

Star

Character Shots

Arrow Siege

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.

	Solo	Vector Bullet	x6	Yin
Sharp Bullet Element: None PWR 2.89 ACC 85% CRI 10% [Target][CRIT Evasion▼]30% chance to apply CRIT Evasion 1 level(s) DOWN debuff to Target (2 turn(s)).
	Solo	Anti-Moon Defensive Arrow	x2	Yang	1
Sharp Bullet Element: None PWR 3.47 ACC 85% CRI 10% [Target][CRIT Evasion▼]30% chance to apply CRIT Evasion 1 level(s) DOWN debuff to Target (2 turn(s)).
	Solo	High Vector Bullet	x2	Yin	2
Sharp Bullet Element: None PWR 4.04 ACC 85% CRI 10%
	Solo	Anti-Moon Guardian Arrow	x3	Yang	3
Sharp Bullet Element: None PWR 3.08 ACC 85% CRI 10%
	Solo	Vector Maneuver Bullet	x3	Yin	3
Sharp Bullet Element: None PWR 3.47 ACC 85% CRI 10% [Moon Rabbit-Killer] [Moon Enemy-Killer] [Lunarian-Killer]
	Solo	Anti-Moon Defiance Arrow	x3	Yang	3
Sharp Bullet Element: None PWR 3.85 ACC 85% CRI 10% [Moon Rabbit-Killer] [Moon Enemy-Killer] [Lunarian-Killer]

Gold God Web

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...

	All	Energy Net	x4	Yang
Energy Bullet Element: None PWR 4.81 ACC 85% CRI 10% [All Targets][Charged]30% chance to inflict Barrier Status: Paralyze to All Targets (2 turn(s)).
	All	Lightning Rod	x1	Yin	1
Energy Bullet Element: None PWR 7.7 ACC 85% CRI 10% [Moon Rabbit-Killer] [Moon Enemy-Killer] [Lunarian-Killer]
	All	Dense Energy Net	x2	Yang	2
Energy Bullet Element: None PWR 4.49 ACC 85% CRI 10%
	All	Lightning Rod Arrow	x2	Yin	3
Energy Bullet Element: None PWR 5.13 ACC 85% CRI 10% [Moon Rabbit-Killer] [Moon Enemy-Killer] [Lunarian-Killer]
	All	Concentrated Energy Net	x2	Yang	3
Energy Bullet Element: None PWR 5.78 ACC 85% CRI 10%
	All	Lightning Net	x2	Yin	3
Energy Bullet Element: Wood PWR 6.42 ACC 85% CRI 10% [All Targets][Charged]30% chance to inflict Barrier Status: Paralyze to All Targets (2 turn(s)).

Character Spell Cards

Available

Limit Break 1

Limit Break 2

Limit Break 3

Curse of the Heavens: Apollo 13

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...

*Pre- and Post- effects assume max level. Effects per level can be viewed here.

Pre-Attack Spell Card Effects

Own Spirit Power 1.00 UP.

Post-Attack Spell Card Effects

Inflicts 2 layer(s) of Barrier Status: Poison to all targets (2 turns). [Additional effect +1 with success rate 60%.]

	All	Curse of the Heavens Arrow	x11	Yin
Sharp Bullet Element: Moon PWR 3.36 ACC 85% CRI 10%
	All	Anti-Moon Offensive Arrow	x2	Yang	1
Sharp Bullet Element: None PWR 7.39 ACC 85% CRI 10% [Moon Rabbit-Killer] [Lunarian-Killer]
	All	Forbidden Arrow	x2	Yin	2
Sharp Bullet Element: None PWR 8.62 ACC 85% CRI 10% [Moon Enemy-Killer]
	All	Forbidden Magic Arrow	x2	Yang	3
Sharp Bullet Element: None PWR 9.86 ACC 85% CRI 10%
	All	Anti-Moon War Arrow	x2	Yin	3
Sharp Bullet Element: Moon PWR 11.09 ACC 85% CRI 10% [Moon Rabbit-Killer] [Moon Enemy-Killer] [Lunarian-Killer]
	All	Taboo Arrow	x2	Yang	3
Sharp Bullet Element: None PWR 12.32 ACC 85% CRI 10% [Moon Rabbit-Killer] [Moon Enemy-Killer] [Lunarian-Killer]

Revival: Seimei Yuugi -Life Game-

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...

*Pre- and Post- effects assume max level. Effects per level can be viewed here.

Pre-Attack Spell Card Effects

Adds 1 layer(s) to party's Barrier.

Post-Attack Spell Card Effects

None

	Solo	Stem Cell Bullet	x7	Yang
Light Bullet Element: Moon PWR 7.92 ACC 85% CRI 10% [Piercing]Attacks target in relation to their original DEF ignoring any DEF buffs or debuffs.
	Solo	Birth Bullet	x2	Yin	1
Light Bullet Element: None PWR 11.09 ACC 85% CRI 10% [Piercing]Attacks target in relation to their original DEF ignoring any DEF buffs or debuffs.
	Solo	Survival Bullet	x2	Yang	2
Light Bullet Element: None PWR 12.94 ACC 85% CRI 10%
	Solo	Overpopulation Bullet	x2	Yin	3
Light Bullet Element: None PWR 14.79 ACC 85% CRI 10% [Sure-Hit]Always hits regardless of Accuracy stat.
	Solo	Next-Generation Cell Bullet	x2	Yang	3
Light Bullet Element: None PWR 16.63 ACC 85% CRI 10% [Moon Rabbit-Killer] [Moon Enemy-Killer] [Lunarian-Killer]
	Solo	Underpopulation Bullet	x2	Yin	3
Light Bullet Element: Moon PWR 18.48 ACC 85% CRI 10% [Moon Rabbit-Killer] [Moon Enemy-Killer] [Lunarian-Killer] [Sure-Hit]Always hits regardless of Accuracy stat.

Heaven Spider's Butterfly-Catching Web

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.

*Pre- and Post- effects assume max level. Effects per level can be viewed here.

Pre-Attack Spell Card Effects

Adds 1 layer(s) to party's Barrier.

Own Yang ATK 5 level(s) UP (1 turn).

Own Yin ATK 5 level(s) UP (1 turn).

Post-Attack Spell Card Effects

None

	All	Electric Surveillance Net	x15	Yin
Laser Bullet Element: Moon PWR 6.16 ACC 85% CRI 10% [Moon Rabbit-Killer] [Moon Enemy-Killer] [Lunarian-Killer]
	All	Anti-Moon Defensive Laser	x2	Yang	1
Laser Bullet Element: None PWR 18.48 ACC 85% CRI 10% [Piercing]Attacks target in relation to their original DEF ignoring any DEF buffs or debuffs.
	All	Electric Communications Net	x2	Yang	2
Laser Bullet Element: Moon PWR 21.56 ACC 85% CRI 10% [Moon Rabbit-Killer] [Moon Enemy-Killer] [Lunarian-Killer]
	All	Anti-Moon Offensive Laser	x2	Yang	3
Laser Bullet Element: None PWR 24.64 ACC 85% CRI 10% [Piercing]Attacks target in relation to their original DEF ignoring any DEF buffs or debuffs.
	All	Electric Analysis Laser	x2	Yang	3
Laser Bullet Element: None PWR 27.72 ACC 85% CRI 10% [Moon Rabbit-Killer] [Moon Enemy-Killer] [Lunarian-Killer]
	All	Electric Capture Net	x2	Yin	3
Laser Bullet Element: Moon PWR 30.8 ACC 85% CRI 10% [Moon Rabbit-Killer] [Moon Enemy-Killer] [Lunarian-Killer] [All Targets][Impact]60% chance to inflict Stun (cancel's action) to All Targets (1 turn(s)).

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

Diluted Ochimizu Lvl 10

CD 4

Recovers 30% of party's HP.

Own CRIT Accuracy 2 level(s) UP (2 turns).

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

Moon Intellect Lvl 10

CD 6

Own Spirit Power 1.00 UP.

Own Evasion 2 level(s) UP (2 turns).

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

Golden Pill Fragment Lvl 10

CD 5

Recovers 30% of party's HP.

Own Yin ATK 3 level(s) UP (1 turn).

Inflicts 2 layer(s) of Barrier Status: Poison to self (1 turn).

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	x20 x10 x20 x10 x10 x10
1 -> 2	2,000	x10 x30 x10 x10 x10 x20
2 -> 3	5,000	x20 x50 x20 x20 x20 x20
3 -> 4	10,000	x20 x100 x20 x20 x20 x30
4 -> 5	15,000	x30 x200 x30 x30 x30 x30

Character Analysis

Eirin Yagokoro was released on August 10th, 2021 in "Festival Prayer: Eternal Exiles of the Moon." She was initially a Festival on release and later added to the general pool. For more up-to-date analysis, be sure to visit the Official Discord Server.

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.

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 Evasion 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

The Witch of Scarlet Dreams

Valued Tools of the Trade

Ordinary Magician

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

Ordinary Magician

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. If she's buffed up to the moon, you can look to The Unmoving Great Library instead for maximum damage.

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 Yang 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

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Eirin Yagokoro

Stats

Races

Element Type Chart

Character Shots

Character Spell Cards

Character Ability

Character Skills

Character Characteristics

Character Change Effect

Upgrade Costs

Character Analysis

Story Card Recommendations

Spell Card

Last Word

Character Skill Level Up Recommendations

Character Strengths

Character Weaknesses

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