English translation in progress. Untranslated passages remain in Japanese.

E.G.O 0807 · TETH

Bygone Days

IshmaelGloomPortrait of a Certain Day

Risk Level: TETH
SP Cost: 20/30/45
Resource Cost: Lust ×2Sloth ×1Gloom ×3E.G.O usable with these resources →
Resistance: ×1×1×1×2×0.5×1×2

GUIDEMechanics and How to Use

At a Glance

A Gloom Slash E.G.O for Sinking teams that heals the 2 allies with the lowest HP, with healing that grows with the enemy's Sinking and Gloom Resonance.

Core Mechanics

Healing allies: After the attack, heals the 2 allies with the lowest HP ratio by (5 + main target's combined Sinking and Sinking Count ÷ 3)% of their max HP, up to 15%. The base rises to 10% at Threadspin Ⅲ, and the cap to 20% at Threadspin Ⅳ.
Adding Sinking: Sinking Count increases by 2 on hit (3 at Threadspin Ⅳ). Healing is calculated after the attack, so her own hits also count toward it.
Multi-target through Resonance: +1 Attack Weight if the highest Resonance is 4 or more. From Threadspin Ⅲ, +1 more if that Resonance is Gloom. At Threadspin Ⅳ, 4 or more Gloom Resonance increases healing by 10% of max HP.
The Uninvited: Inflicted on hit, up to 2. The bearer takes 0.5% more damage per Sinking, up to 10%. It also inflicts Curse.
Passive — Interloper Reception: +1 Clash Power if the target has The Uninvited or a Panic Type change effect. On hit, restores 5 SP to the ally with the lowest SP, once per turn.

How to Use

Firing it after Sinking Identities have stacked Sinking on the enemy increases the healing.
Gather Gloom resources and Resonance to aim for the Attack Weight and healing increases from Threadspin Ⅲ.
The Corrosion skill costs 10% of her max HP on use, and from Threadspin Ⅲ inflicts Echoes of the Manor next turn. Normally, use Awakening.

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

ANALYSISThreadspin

Ⅱ: Unlocks Interloper Reception.
Ⅲ: Raises the healing base value, and Gloom Resonance increases Attack Weight. At 4 or more Gloom Resonance, it also inflicts Gloom Fragility.
Ⅳ: Raises the healing cap to 20%, Sinking Count to 3, and Curse to 2.

SKILLSSkill

Awakening

Awakening skill

Slash

Clash Power: 17~26
Base Power: 17
Coin Power: +9
No. of Coins: 1
Skill Level: Identity Lv+2
Attack Weight: 1

Before Attack At 4+ highest Reson., gain +1 Atk Weight

[Attack End] Heal 2 allies with the lowest HP percentages by (5/10 + ( on the main target + Count on the main target)/3)% HP (max 15%/20%)

- If the said Reson. was a Gloom Reson., gain +1 Atk Weight

- If the highest Reson. was a 4+ Gloom Reson., heal 10% more of the max HP

ⅠOn Hit Inflict +2/+3 Count

On Hit Inflict 1/2

On Hit Inflict 2

On Hit At 4+ Gloom Reson., inflict 1

Corrosion

Corrosion skill

Slash

Clash Power: 18~28
Base Power: 28
Coin Power: -10
No. of Coins: 1
Skill Level: Identity Lv-3
Attack Weight: 3

Indiscriminate

Prioritizes targets that have the most

Before Attack Lose HP by 10% of Max HP (does not get Staggered due to this effect)

[Attack End] Heal 3 other allies with the lowest HP percentages by (5 + (( on the main target + Count on the main target))/3)% HP (max 10%)/[Attack End] Heal 3 other allies with the lowest HP percentages by (10 + ( on the main target + Count on the main target)/3)% HP (max 15%)

- At 4+ highest Reson., heal 1 additional ally

- If the said Reson. was a Gloom Reson., heal an additional 5% HP

ⅠOn Hit Inflict +2/+3 Count

On Hit Inflict 1/2

On Hit At 3+ Gloom Reson., inflict 1 /On Hit For every 3 Gloom Reson., inflict 1 (max 2)

On Hit Inflict 2

On Hit Inflict 2 next turn

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

Interloper Reception

If the target has or any of the Panic Type changing effects, Clash Power +1.

On Hit against the said target, heal 1 ally with the least SP for 5 SP. (once per turn)

SYNERGYTeams and Synergies

Molar Boatworks Fixer: S2 (Sloth) and S3 (Gloom) supply the required affinities, S2 and S3 inflict Sinking, and S1 increases Sinking Count.
Edgar Family Butler: S1 (Sloth) and S3 (Gloom) supply the required affinities, and she has many skills that inflict Sinking.

Team Builds That Suit This E.G.OSinking Team

KEYWORDSEffect Glossary

Fragile: Take more damage from skills based on the effect’s Count for one turn. (Max 10)
Sinking: When hit by an attack, take fixed SP damage by the effect’s Potency. (Non-SP Units take Gloom damage instead.) Then, reduce its Count by 1.
Curse: Turn End: Next turn, randomly gain one of the following, then reduce this effect’s Count by 1. 1 Attack Power Down/1 Defense Power Down/2 Offense Level Down/2 Defense Level Down.
Gloom Fragility: Take more damage from Gloom skills based on the effect’s Count for one turn. (Max 10)
The Uninvited: - Max Value: 2 - Upon death, the last attacker heals 3 SP; then, a random ally without this effect gains 2 Stacks of this effect. - Take +0.5% damage for every Sinking on self (max 10%; for Focused Encounters, count Sinking on each Part separately) - Turn End: reduced by 1
Dejection: - Low Morale - In a clash, if any Coin lands tails, Clash Power -1 for the clash
Echoes of the Manor: - 50% chance to gain +1 Sinking Count when gaining Sinking Potency or Count from Skill or Coin effects - SP Units: Change Panic Type to Echoes of the Manor. When this unit Panics, inflict 2 Echoes of the Manor to 2 random other allies of this unit next turn - Non-SP Units: -10% chance to flip Heads - Reduced by 1 at Turn End This effect is not cumulative; inflicting it will replace the current value with the inflicted value. ※ Apply the "Non-SP Units" conditional to certain enemies that have SP but can't change their Panic Types.