English translation in progress. Untranslated passages remain in Japanese.

E.G.O 0109 · HE

Solemn Lament

Yi SangGloomFuneral of the Dead Butterflies (Lobotomy Corporation / Library of Ruina)Walpurgisnacht event exclusive

Risk Level: HE
SP Cost: 20/25/38
Resource Cost: Sloth ×1Gloom ×4Pride ×2E.G.O usable with these resources →
Resistance: ×1×1×0.75×2×0.5×1×2

GUIDEMechanics and How to Use

At a Glance

A 5-Coin E.G.O that distributes attacks across multiple targets and chiefly serves as an upgrade for Lobotomy E.G.O:: Solemn Lament Yi Sang, granting him special benefits including Tremor application.

Core Mechanics

Passive (unlocked at Threadspin Ⅱ): While equipped at this tier, Solemn Lament Yi Sang's Base Skills inflict 2 Tremor on hit, once per skill; both the Identity and his Base Skills count as inflicting Sinking and Tremor. The following additional benefits activate from the turn after using the E.G.O: his ammunition cap for The Living & The Departed increases by 10. After Reloading, restores 10 SP and Discards 1 Base Attack Skill, up to 2 times per turn. Equipping a defense skill also restores 10 SP at Turn End.
Applying and spending Butterfly: Coins Ⅰ–Ⅳ randomly apply Butterfly to their targets on hit, in amounts of 1, 2, 2, and 3. Coin Ⅴ consumes all of his own ammunition, The Living & The Departed, inflicts 3 Sinking and 3 Tremor, and triggers Tremor Burst. Butterfly on the target and Yi Sang's own ammunition are separate resources.
Damage from Threadspin upgrades: Threadspin Ⅲ adds Gloom damage on Coin Ⅴ based on all Butterfly on the target. Threadspin Ⅳ adds Gloom Fragility and Gloom Resist Down to Coin Ⅳ, plus Sinking Count increases on Coins Ⅰ–Ⅳ.
Benefits exclusive to Solemn Lament Yi Sang: Before attacking, that Identity gains ammunition equal to Gloom Resonance + 1, up to 7, then Reloads after attacking. Reloading costs SP equal to (30 − remaining ammunition) ÷ 2.

How to Use

The passive unlocked at Threadspin Ⅱ is its main value. Treat the attack itself as a secondary benefit of activating this upgrade.
Since Butterfly is applied to targets, focusing on one enemy can improve the payoff. The skill expends ammunition and Reloads, so use it with SP to spare.
All Coins are Unbreakable. Its Clash range is 6–16, or 6–21 at Threadspin Ⅳ. Threadspin Ⅳ also adds +1 Clash Power per 4 combined Sinking Potency and Butterfly on the main target, up to +4.
Costs 1 Sloth, 4 Gloom, and 2 Pride. SP cost: 20 Awakening, 25 Corrosion, 38 Overclock.
Sin resistances: Fatal to Gluttony and Envy (×2); Ineffective against Gloom (×0.5).

A practical guide based on the skill and passive descriptions below.(Updated: 2026-10-18)

ANALYSISThreadspin

Ⅱ: Unlocks the passive: equipping it grants Solemn Lament Yi Sang Tremor application; the other listed benefits begin the turn after E.G.O use.
Ⅲ: Adds Butterfly-based Gloom damage to Coin Ⅴ.
Ⅳ: Adds Gloom Fragility and Gloom Resist Down, raises Coin Power from +2 to +3, and adds the Clash Power condition, substantially improving the E.G.O.

SKILLSSkill

Awakening

Awakening skill

Pierce

Clash Power: 6~216~16 → 6~21
Base Power: 6
Coin Power: +3+2 → +3
No. of Coins: 5
Skill Level: Identity Lv+4
Attack Weight: 3

When randomly inflicting with this skill, the chance to inflict The Departed equals the Heads chance; otherwise inflict The Living (roll separately for every 1 )

Gain +1 Clash Power for every 4 of the main target's combined and total (max 4)

If this unit is Lobotomy E.G.O::Solemn Lament Yi Sang:

- Before Attack Randomly gain equal to Gloom Resonance + 1 (max 7)

- After Attack Reload

Ⅰ

On Hit Randomly inflict 1

On Hit Increase Count by 1

Ⅱ

On Hit Randomly inflict 2

On Hit Increase Count by 1

Ⅲ

On Hit Randomly inflict 2

On Hit Increase Count by 1

Ⅳ

On Hit Randomly inflict 3

On Hit Increase Count by 1

On Hit Inflict 1 Gloom Fragility and 1 Gloom Res. Down this turn and next turn

Ⅴ

Consume all held

On Hit Inflict 3

On Hit Inflict 2 (The Living)

On Hit Inflict 2 (The Departed)

On Hit Trigger , then reduce Count by 1

On Hit Deal Gloom damage equal to the target's total

On Hit Deal Gloom damage equal to ( consumed by this Coin × 2)% of this Coin's final damage

Corrosion

Corrosion skill

Pierce

Clash Power: 7~16
Base Power: 16
Coin Power: -3
No. of Coins: 3
Skill Level: Identity Lv+4
Attack Weight: 3

Indiscriminate

Attack random targets

Gain +1 Clash Power for every 4 of the main target's combined and total (max 4)

Before Attack Increase Attack Weight by the highest Resonance ÷ 2 (max 2, rounded down)

Before Attack Lose 2 Base Power for every 1 destroyed Coin (max -6)

Ⅰ

On Hit Inflict 3 (The Living)

Ⅱ

On Hit Inflict 3 (The Departed)

On Hit Inflict 1 Gloom Fragility and 1 Gloom Res. Down this turn and next turn

Ⅲ

On Hit Inflict 5

On Hit Trigger , then reduce the target's Count by 1

On Hit Deal Gloom damage equal to the target's total

On Hit Deal Gloom damage equal to the target's Potency

Normal Coin Unbreakable CoinThreadspin Ⅲ Threadspin Ⅳ mark additions or changes at those Threadspin tiers. Multiple values represent different tiers; the larger value is for the highest tier.

PASSIVEE.G.O Passives

E.G.O Passives

TheWilt-wingedButterflyFeedsUpon ThePauperDewInMistedBreath

If the target has , gain +1 Clash Power

On Hit against a target whose and total add up to 15 or more, inflict 1 (The Living) and 1 (The Departed) (1 time per 1 turn; checked per part in Focused Encounters)

Always-active effect exclusive to Lobotomy E.G.O::Solemn Lament Yi Sang

On Hit with basic skills, inflict 2 on the target (once per 1 skill)

This Identity is considered to inflict and

- Its basic skills are considered skills that inflict and

Effect exclusive to Lobotomy E.G.O::Solemn Lament Yi Sang

Increase the maximum combined Potency and Count of by +10

After Reloading, heal 10 SP and Discard 1 lowest-rank basic attack skill from all Skill Slots, excluding Goodbye Now, a Sorrow in You (2 times per 1 turn)

At Turn End, if a Defense Skill was equipped, heal 10 SP

If Staggered at Turn End, remove Stagger and Reload (once per 1 battle; excludes forced Stagger)

※Unlocked at Threadspin Ⅱ; active from the turn after E.G.O use until the end of battle

SYNERGYTeams and Synergies

Lobotomy E.G.O:: Solemn Lament: The Identity that receives this E.G.O's special Butterfly, Reload, and Tremor benefits. Gloom S2 and defense help supply its resources.
Effloresced E.G.O::Spicebush: Uses both Sinking and Tremor, matching this E.G.O's effects.

Team Builds That Suit This E.G.OSinking Team

KEYWORDSEffect Glossary

Unfocused Volley: - When tossing a Coin of this skill, randomly choose 1 of the attack targets to attack - The 1st Coin always hits the main target - All On Hit effects and that Coin's damage apply only to the target chosen by the above effect
Butterfly: Special Sinking Default: 0; maximum: 15 This effect's Potency is The Living; its Count is The Departed. When taking damage, heal the attacker's SP by The Living ÷ 4 (minimum 1, rounded down). If SP is below 0 when taking damage, take Gloom damage equal to Sinking Potency ÷ 5 for every 1 The Departed (maximum Gloom damage: 30, rounded down; halve this damage against targets without SP). At Turn End, reset The Departed to 0. Inflict Sinking equal to The Living, then convert The Living into The Departed. External effects cannot increase this effect's infliction amounts. Extra Sinking infliction effects add Sinking instead of extra Butterfly. Remove this effect when both The Living and The Departed reach 0.
Sinking: When hit by an attack skill, take fixed SP damage equal to the Potency (converted to Gloom damage for Abnormalities). After taking damage, reduce Count by 1.
The Living & The Departed: Special ammunition Maximum combined Potency and Count: 20 Consumed when using certain skills. When consumed, randomly consume The Living (Potency) and The Departed (Count). If insufficient ammunition remains when consuming it, cancel the attack.
Unbreakable Coin: This Coin is not destroyed on Clash Lose. If an attack skill contains this Coin, attack with it after taking damage. On Clash Lose, the Power of the remaining unbroken Coin becomes 1.
Fragile: For 1 turn, damage taken from skills increases in proportion to this value (maximum 10).
Tremor: When taking damage from a skill that triggers Tremor Burst, raise the Stagger Threshold by the Potency. At Turn End, reduce Count by 1.
Tremor Burst: Raise the target's Stagger Threshold by their Tremor Potency.
Reload: Applies to The Living & The Departed special ammunition. Lose SP equal to (30 - The Living & The Departed held) ÷ 2, rounded down. Set The Living & The Departed to 0, then gain a total equal to the maximum ammunition capacity, using the probabilities of ISeeTheDyingButterfly. Gain at least 1 each of The Living and The Departed when Reloading.