[The House of Spiders: The Index Nursefather] Yi Sang

[The House of Spiders: The Index Nursefather] Yi Sang NEW!

000
Gluttony
x3
Pride
x2
Gloom
x1
SSS

Endgame

Isekai Train Simulation and Strategy RPG! Conductor, Your Trade Journey Awaits!

Introduction

[The House of Spiders: The Index Nursefather] Yi Sang is a 000 rarity Identity from the Sinner Yi Sang that was added to the game on February 19th, 2026. To learn more about [The House of Spiders: The Index Nursefather] Yi Sang check the sections below. Use the tabs to quickly switch to the kind of information you're looking for - skills, affinities and more!

Isekai Train Simulation and Strategy RPG! Conductor, Your Trade Journey Awaits!

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Review

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Profile

Affinities
Affinity 1
Gluttony x3
Affinity 2
Pride x2
Affinity 3
Gloom x1
Specialities
Poise
Sinking
Skills
Skill 1

"Enwrap 330 times in Long Swaths of Frozen Blood"

Gluttony

Attack Type: Blunt

Skill Power: 3

No. of Coins: 2

Coin Power: 4

Offense Level: 57

Atk Weight: 1

(75 - (Karmic Consequence / 2))% chance to produce a Blunt weapon

- Coins using Blunt weapons deal +15% damage If this Skill is marked with Mark of the Prescript, Clash Power +1 and deal +20% more damage

Coin Power +1 for every 6 (Poise on self + Sinking on target) (max 2)

[On Use] Convert Coins equal to (Unlock stage - 1) into Unbreakable Coins, beginning with the final Coin

[On Use] Gain + 2 Poise Count

2 [On Hit] Gain 2 Poise
[On Hit without Cracking]Inflict 2 Sinking
Skill 2

Revel with Soundless Applause, Impale in Voiceless Sorrow"

Pride

Attack Type: Pierce

Skill Power: 4

No. of Coins: 3

Coin Power: 4

Offense Level: 58

Atk Weight: 1

(75 - (Karmic Consequence / 2))% chance to produce a Pierce weapon

- Coins using Pierce weapons deal +15% damage If this Skill is marked with Mark of the Prescript, Final Power +1

Coin Power +1 for every 6 (Poise on self + Sinking on target) (max 2)

[On Use] Convert Coins equal to (Unlock stage) into Unbreakable Coins, beginning with the final Coin

[On Use] Gain 3 Poise

2 [On Hit] Inflict 3 Sinking
3 [On Hit] Gain =2 Poise Count
[On Hit without Cracking] Inflict +1 Sinking Count
Skill 3

"Raise and Laugh the Blade, Cry the Waterfall Like the Scent of Fallen Leaves"

Gloom

Attack Type: Slash

Skill Power: 4

No. of Coins: 4

Coin Power: 3

Offense Level: 59

Atk Weight: 1

Turn Start: At 9 Procuration [Hermes], change this Skill to 'Furioso-Replica' (once per turn)

- Prioritizes the Skill on the leftmost Slot's bottom row on the Dashboard

- [Before Use] At less than 9 Procuration [Hermes], use as Skill 3

(75 - (Karmic Consequence / 2))% chance to produce a Slash weapon

- Coins using Slash weapons deal +25% damage If this Skill is marked with Mark of the Prescript, deal +20% damage

Coin Power +1 for every 6 (Poise on self + Sinking on target) (max 2)

[On Use] Convert Coins equal to (Unlock stage + 1) into Unbreakable Coins, beginning with the final Coin

[On Use] Gain +3 Poise Count

- Gain additional Poise equal to (Unlock stage)

2 [On Hit] Gain 3 Poise
3 [On Hit] Inflict 3 Sinking
4 Deal +20% damage for every Unlock stage (max 60%)
[On Crit] Gain +1 Poise Count
[On Hit without Cracking] Inflict +3 Sinking Count
Skill 4

Furioso-Replica

Wrath

Attack Type: Slash

Skill Power: 3

No. of Coins: 9

Coin Power: 3

Offense Level: 60

Atk Weight: 7

Only 1 copy of this Skill can exist on the Dashboard If this Skill is marked with Mark of the Prescript, deal +10% damage

This Skill's Coin Power does not change; instead, for every net Coin Power increase, Final Power +5 and deal +25% damage (this Skill is not affected by Paralyze)

Final Power +1 for every 6 (Poise on self + Sinking on target) (max 2)

[Combat Start]

- Convert all Coins on this Skill to Unbreakable Coins

- Inflict 1 Sinking or gain 1 Poise with every hit of this Skill

- Does not gain Procuration [Hermes] for this turn

[On Use]

- Clash Power +3

- Gain 3 Poise and +3 Poise Count

[After Attack]

- Inflict 5 Burn, 3 Bind, and 3 Fragile next turn to all targets this unit hit

- Consume all Procuration [Hermes]

9 Weapon assigned to this Coin is fixed as Scythe
Deal +90% Damage on Critical Hit
[On Hit without Cracking] Inflict +3 Sinking Count
DefenseEvade

By Unpredictable Whim

Gloom

Attack Type: -

Skill Power: 4

No. of Coins: 1

Coin Power: 10

Offense Level: 57

Atk Weight: 1

At Unlock - III, Coin Power +2

[Combat Start] Gain +2 Poise Count (once per turn)

[On Evade] Gain 2 Poise (2 times per turn)

[Turn End] At below Unlock - II, activate the following effects (once per Encounter):

- Gain Unlock - II

- If Grace of the Prescript Stack is less than 6, raise the Stack to 6

- Gain 5 Karmic Consequence at the start of the next turn for every Grace of the Prescript gained via the effect above

Passives
Passive

Prescript Delivered on a Device

Turn Start:

- Gain Prescript: [Device] I / Prescript: [Device] II / Prescript: [Device] III / Prescript: [Device] IV based on Unlock stage on self

- Inflict The Prescript's Target to a random enemy (in Focused Encounters, a Part)

- Apply Mark of the Prescript to Base Attack Skills on this unit's Dashboard (1 per Slot, max 2 Skills)

· At Unlock - II+, the effect above prioritizes Skill 3 (prioritizes empowered Skill)

- All of the effects above and Prescript execution checks do not trigger when this unit is Staggered, immobilized, in Panic, or in E.G.O Corrosion

Passive

The Oracle's Proxy / Unlock

Turn End: If Prescript was executed this turn at below Unlock - II, heal 4 SP and gain 1 Grace of the Prescript (once per turn)

- When executing Prescript, if the main target has The Prescript's Target, heal 8 SP and gain 3 Grace of the Prescript instead

Turn End: If this unit is at Unlock - II and Prescript was executed this turn, heal 4 SP

- When executing Prescript, if Procuration [Hermes] has reached 9 Stacks, heal 8 SP and gain 3 Grace of the Prescript

Turn End: If Prescript was not executed this turn, gain 5 Karmic Consequence

- At Unlock - III, does not gain Karmic Consequence

- If this unit attempted to execute Prescript at Combat Start, but could not target the enemy during the combat phase, does not gain Karmic Consequence at Turn End (applies below Unlock - II)

Turn End: At 3/6/9 Grace of the Prescript, gain Unlock - I / Unlock - II / Unlock - III

Turn Start: At Unlock - III, gain Shin (心) - Fate

Passive

The Index Nursefather

Upon entering the Encounter for the first time, gain Wound-casing Mask

- Turn End: If this unit was Staggered for the first time in this Encounter while under this effect, recover from Stagger (excluding forced Stagger) and convert Wound-casing Mask to Sizzling Wound

Apply Desire for Acknowledgement Sated to The Index Proxy - Effloresced E.G.O::Procuration Don Quixote when both units are on the field

Passive

Oracle Device [Caduceus]

A random weapon is assigned to every Coin for Base Attack Skills.

Each weapon has a unique effect.

- When hacking through the ribs with a hatchet...

- When penetrating the lungs with a stiletto...

- When cleaving through the shoulder and the skull with a bastard sword...

- When punching 10 or more holes in the torso with a rapier...

- When caving in the back of the skull with a hammer...

- When rending the body with a great sword...

- When boring a 20-inch hole with a lance...

- When ripping the flesh to ten thousand strips with a whip...

- When lacerating through space itself with a scythe, like a certain someone...

Gain 1 Procuration [Hermes] when using Skills with Mark of the Prescript

Convert Wound-casing Mask to Sizzling Wound at the end of the turn this unit used 'Furioso-Replica' for the first time in this Encounter

Turn Start: If this unit has Sizzling Wound and has 'Furioso-Replica' on the Dashboard, gain Indulgence in Prescripts

Passive

Imitation of a Life

x1 Gluttony [Owned] x1 Gloom [Owned] x1 Pride [Owned]

Deal +2% damage with Skills marked with Mark of the Prescript for every Grace of the Prescript on self (max 16%)

- At 9 Grace of the Prescript, deal +20% damage with Base Skills instead

On Hit with Base Attack Skill's Unbreakable Coins, gain 1 Procuration [Hermes]

- Attack End: Gain Procuration [Hermes] equal to (# of remaining Unbreakable Coins)

- 'Furioso-Replica' Attack End: Gain Procuration [Hermes] next turn equal to (# of this Skill's remaining Unbreakable Coins / 2) (rounded down)

If Procuration [Hermes] reached 9 Stacks this turn at Turn End, and if this unit does not have a Skill 3 on the Dashboard at the start of the next turn, convert a Base Skill to Skill 3 (prioritizes the Skill on the leftmost Slot's bottom row)

Support

Grace of God

x1 Gluttony [Owned] x1 Gloom [Owned] x1 Pride [Owned]

Deal +5% damage with Slash, Pierce, and Blunt Base Attack Skills that are used for the first time by any ally each turn (once per type across all allies)

- The Index Identities deal +10% damage instead

- This effect's application is determined Before Attack

Stats (At level 60)
Status
Stat
Max HP
248
Stat
Speed Range
3-8
Stat
Defense
62
Resistances
Stat
Slash RES
Ineff.
Stat
Pierce RES
Fatal
Stat
Blunt RES
Normal

Review

Review

The House of Spiders: The Index Nursefather Yi Sang, who will be referred to as Index Yi Sang in this review, is an exceptionally strong Poise Sinking Damage Dealer and the first Identity to have a skill with 9 Coins.

Index Yi Sang's whole kit is rather lengthy and wordy, which is why we need to talk about his passives first, as a lot is going on. Like other Index Identities, Yi Sang has to follow the Prescript and do certain things in order to accumulate Grace of the Prescript and, like Index Don, to also gain further levels of Unlock, further strengthening him throughout the fight. The Unique parts in Yi Sang’s kit are the “Procuration [Hermes]” status, passive “Oracle Device [Caduceus]” with its 9 weapons associated with that passive and unique to self status “Wound-casing Mask”. 

Let's start with the first passive. Procuration [Hermes] is accumulated through multiple methods, consisting of using skills marked with “Mark of the Prescript”, hitting the enemy with Unbreakable Coins or if the enemy dies before the skill finishes, the number of stacks gained for the third condition is equal to the number of remaining Unbreakable Coins halved. The number gained per turn is capped by the level of “Unlock” status. Procuration by itself does nothing as it is rather sort of “countdown”, that upon reaching 9, allows Yi Sang to use his and as far as the game goes at the time of this review, a VERY special 9 Coin Skill.

Alongside Procuration, we have “Oracle Device [Caduceus]” passive that upon doing damage with Coins, will assign a random weapon out of 9, each of which has different effects associated with it. Explaining them all would be a bit too much, but the most important one is the last weapon, the Scythe, as it not only has the highest damage boost among the others, that is 30%, but it is also a guarantee Critical Hit if used on the Unbreakable Coin that has won the Clash. 

Last to explain is the “Wound-casing Mask”. This effect makes Yi Sang take less damage from Unopposed Attacks and provides him with +2 Offense Level at the cost of -2 Defense Level. Also, once per battle, this status will recover Yi Sang from Stagger and convert itself into “Sizzling Wound”. “Sizzling Wound” boasts better Damage Reduction for Unopposed Attacks, +3 Offense Level, -3 Defense Level and +15% damage boost to damage dealt with Unbreakable Coins. Oh, and 1 Bleed and Burn per turn, but that part barely matters. Same with - Defense Level, as that is offset by the Unlock that provides +3 Defense Level at stage 3. Additionally, when “Sizzling Wound” is active, and his Signature Skill is on board, Yi Sang will gain bonus effect of “Indulgence in Prescripts”, that ensures he is the fastest thanks to +5 Min and Max Speed, does even more damage because why not, inflicts more Sinking and gains more Poise for the turn his Signature Skill is available for use.

Now, before we talk about skills, it needs to be said that all Skills have an effect of converting their Coins into Unbreakable Coins (for the purpose of accumulating “Procuration [Hermes]”) based on the Unlock stage. The higher the stage, the more the Coins. 

Additionally, all his base skills have 1 damage type associated with them and the higher “Karmic Consequence” is (status obtained by not following the Prescript that barely does anything for other Index Identities), the lower the chance is for “producing” weapons associated with the skill’s damage type. For example, Skill 1 is Blunt, so it will try and produce Blunt Weapons for its Coins from the passive “Oracle Device [Caduceus]” and the higher the Karmic is, the lower the chance will be.

  • Skill 1 - "Enwrap 330 times in Long Swaths of Frozen Blood" - 2 Coins - 11 Min Roll - 15 Max Roll (16 Clash) - High damage Skill 1, as far as those go, and once ramped up, it is a Poise Neutral skill.

  • Skill 2 - "Revel with Soundless Applause, Impale in Voiceless Sorrow" - 3 Coins - 16 Min Roll - 23 Max Roll - Same situation as with Skill 1, very high damage and Poise neutrality later on.

  • Skill 3-1 - "Raise and Laugh the Blade, Cry the Waterfall Like the Scent of Fallen Leaves" - 4 Coins - 16 Min Roll - 24 Max Roll - High damage Skill 3 that is also Poise Positive once ramped up. Try to use this skill before the Special one comes up, so you maximize the damage Yi Sang can put out

  • Defensive Skill - By Unpredictable Whim - Evade - 1 Coin - 14 Min Roll - Max Roll 14 - Evade that lets Yi Sang skip into Unlock - II stage instantly, on top of providing Poise and Poise Count for next turn.

Now the main “dish”:

  • Skill 3-2 - Furioso-Replica - 7 Atk Weight - Unfocused Volley - 9 Coins - 30 Min Roll - 32 Max Roll (Clash 35) - While this skill can get more Final Power and roll higher than written, it is mostly achievable only in Mirror Dungeon. So let's leave that part out and focus on the truly important thing. Furioso-Replica is only usable when “Procuration [Hermes]” reaches 9 stacks. Then, even if skill is not present on the Dashboard, the game will first convert Skill 1 or Skill 2 into Skill 3, or if Skill 3 is already on the Dashboard, it will be converted into Furioso-Replica, meaning this skill will always be available on 9 Stacks of Procuration are reached, ensuring reliability. Now, how often can this skill be used back-to-back? First use will come at turn 5 usually, then every 3 or 4 turns. While it is not “spammable” as Mao Faust S3-2, its damage more than makes up for it. 9 Coins itself guarantees serious damage, but then damage boosts from different weapons, all damage buffs he has in his kit come into play, which allows numbers to get absurd. Especially on the last Coin, which is guaranteed to Crit (even without Poise) and nearly doubles its damage on Crit, thanks to Scythe being fixed as the 9th Weapon. And if the enemy was not dead once this skill ends rolling, the enemy gets inflicted with 5 Burn (cosmetic really), 3 Bind (they are staggered most of the time or dead, so it won’t matter), and 3 Fragile that ensures whoever survives, won’t next turn. Oh, and if the enemy died mid skill use, “Procuration [Hermes]” will be partially refunded, allowing faster usage of the next Furioso-Replica.

The only ID comparable in Index Yi Sang damage output is Mao Faust, another pretty much “broken” Identity, thanks to her ability to spam her enhanced Skill 3-2. While Yi Sang can’t spam his Signature Skill, he makes up for it with straightforward high damage on every skill he throws at the enemy, not only his Furioso-Replica. He works both in the Poise team and in the Sinking team, which is focused on the “Manor” debuff.

Index Yi Sang is an ideal generalist who can be run in any team to perform exceptionally well, no matter the situation. Even if the fight is short, where he can’t use his Furioso-Replica, his own skills do high enough damage that it won’t matter that 9 Coins were not unleashed. 

No notable E.G.O. Synergies

Pros & Cons
Pros

  • Very, very high and consistent damage.

  • Straightforward despite lengthy wording.

  • First ID to have all 3 Physical Damage types.

  • Lots of Fragility and debuffs infliction with his various different weapons.

Cons

  • If the fight is too short, you won’t see Furioso-Replica.

  • Weapon effects casino inconsistency.

Suggested EGO

In this section we have listed best E.G.O.s, one per their rank for the Identity - starting with Zayin from left.

[Crows's Eye View] Yi Sang
[Crows's Eye View] Yi Sang
[Wishing Cairn] Yi Sang
[Wishing Cairn] Yi Sang
[Fell Bullet] Yi Sang
[Fell Bullet] Yi Sang
[Great Trichiliocosm (三千大世界)] Yi Sang
[Great Trichiliocosm (三千大世界)] Yi SangNew

Gallery

Gallery
Full design (tier 3)