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MementoMori

How to Beat Eureka

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MementoMori's Eureka is one of the witches players will frequently encounter across the game. Read on to learn how to make use of the game's witches and mechanics to defeat them in battle.

EurekaEureka Icon
Best Builds How To Beat
Story and Profile

List of Contents

How to Beat Eureka

How to Beat Eureka Overview

Eureka
MementoMori - Eureka Icon
PvE Rank PvP Rank
MementoMori - B Icon MementoMori - A Icon
Base Rarity Soul Type Role
SR (Limited) MementoMori - Azure Icon Azure MementoMori - Sorcerer Icon Sorcerer Debuffer

Eureka's skills focus on dealing damage, applying debuffs, and providing defensive support. Her skills can inflict the X Mark debuff on enemies, reducing their damage output. She can also cleanse debuffs from herself and allies, and provide a powerful shield to an ally upon her defeat.

Eureka Strengths and Weaknesses

Strengths Weaknesses
• Carrot Magic deals AoE damage and has a chance to inflict a debuff that reduces enemy damage output.
• My Own Eureka Pace deals high damage, especially against enemies with the "X Mark" debuff.
• Reactively inflicts the "X Mark" debuff on enemies and dispels debuffs from allies when Eureka is debuffed.
• Grants a powerful shield to an ally upon Eureka's defeat, with the shield's strength scaling based on the number of enemies with the "X Mark" debuff. 		• Targets are chosen randomly, reducing their potential impact.
• Most skills rely on the "X Mark" debuff to have improved damage
• On To New Frontiers relies on Eureka being debuffed and the debuff application is not guaranteed.
• Dreamy Adventure's shield only triggers upon Eureka's defeat, conditional ATK buff if the ally getting the shield is Azure soul.

Eureka Skill Analysis

Memento Mori - Carrot Magic Icon
Carrot Magic 		Memento Mori - My Own Eureka Pace Icon
My Own Eureka Pace

Skill Skill Effect
Memento Mori - Carrot Magic Icon
Carrot Magic 		Level 1 (Unlocks by default)
Deals 1 magical attack equal to 120% of Eureka’s ATK to 2 random enemies, and has a 50% chance to inflict［X Mark］ on all targets for 2 turns. ［X Mark］ decreases the damage an afflicted target deals by 10%.
Level 2 (Unlocks by level 81)
The magical attack’s damage becomes equal to 180% of her ATK.
Level 3 (Unlocks by level 161)
The chance to inflict ［X Mark］ becomes 70%.
Skill Skill Effect
Memento Mori - My Own Eureka Pace Icon
My Own Eureka Pace 		Level 1 (Unlocks by level 11)
Deals 1 magical attack equal to 340% of Eureka’s ATK to 2 random enemies.
Level 2 (Unlocks by level 21)
The magical attack’s damage becomes equal to 440% of her ATK.
Level 3 (Unlocks by level 101)
Additionally, if a target is afflicted with ［X Mark］, the magical attack’s damage to that target becomes equal to 1760% of Eureka’s ATK.
Level 4 (Unlocks by level 181)
The targets of this skill become 3 random enemies.

Carrot Magic deals damage to multiple enemies. It has a chance to inflict the [X Mark] debuff, reducing enemy damage output. It also increases in damage with each level with around 120-180% and a 50-70% chance to inflict the [X Mark] debuff. Carrot Magic has random targetting so it may potentially miss key targets. While the damage is decent, it is not exceptionally high and the chance to inflict the [X mark] debuff is not guaranteed. It is also prone to being dispelled or stolen.

My Own Eureka Pace deals significant damage to multiple enemies. It can deal massive damage to enemies who are afflicted with the [X Mark] debuff. Like Carrot Magic, it also increases in power and targets within each level. It starts with 340-440% damage but if the target is inflicted with [X Mark], the damage becomes equal to 1760% of Eureka's ATK. My Own Eureka's increased damage potential is tied to the [X Mark] debuff.

Memento Mori - On To New Frontiers Icon
On To New Frontiers 		Memento Mori - Dreamy Adventurer Icon
Dreamy Adventurer

Skill Skill Effect
Memento Mori - On To New Frontiers Icon
On To New Frontiers 		Level 1 (Unlocks by level 41)
When Eureka is inflicted with a debuff from an active skill, this skill has a 70% chance of inflicting ［X Mark］ on 3 random enemies for 2 turns. ［X Mark］ decreases the damage an afflicted target deals by 10%.
Level 2 (Unlocks by level 121)
Additionally dispels 1 debuff each from Eureka and the 2 allies with the highest ATK.
Level 3 (Unlocks by level 201)
Additionally, if the debuff that is inflicted on Eureka is an action hindering debuff, the targets who are inflicted with ［X Mark］ become 5 random enemies.
Skill Skill Effect
Memento Mori - Dreamy Adventurer Icon
Dreamy Adventurer 		Level 1 (Unlocks by level 61)
When Eureka is defeated, this skill grants the ally with the highest ATK other than Eureka ［Shield］ equal to 150% of Eureka’s ATK before any stat increases or decreases were applied to it for 4 turns (cannot be dispelled).
Level 2 (Unlocks by level 141)
Additionally, the size of ［Shield］ is further increased by 150% of Eureka’s ATK before any stat increases or decreases were applied to it for each enemy who is afflicted with ［X Mark］ (total max increase equal to 900% of her ATK before any stat increases or decreases were applied to it).
Level 3 (Unlocks by level 221)
Additionally, if the target who is granted ［Shield］ is an Azure Soul ally, increases the target’s ATK by 50% (cannot be dispelled).

On To New Frontiers has a reactive debuff and dispel. It triggers when Eureka is debuffed, providing a defensive and offensive counter. It can affect multiple enemies with the [X Mark] debuff. This skill removes debuffs from Eureka and her highest ATK allies. Just like her earlier skills, On To New Frontiers becomes more powerful as Eureka levels up, potentially affecting more enemies based on fulfilling conditions.

Dreamy Adventurer grants a [Shield] to the strongest ally when Eureka gets defeated. This [Shield]'s size increases based on the number of enemies with the [X Mark] debuff. If this [Shield] lands on an Azure soul ally, the target will be given a 50% ATK buff. The [Shield] and Azure soul ATK buff is a buff that cannot be dispelled.

Witches to Beat Eureka

Eureka Hard Counters

MementoMori - Lunalynn IconLunalynn

Both Ice Coffin and Blizzard of Despair deal significant AoE damage, which can quickly reduce Eureka's HP. Both skills also have debuffs like [Silence] and [Poison] that can disrupt her actions and reduce her overall damage output. Since Eureka doesn't have HP regen or revival capabilities, [Poison] can do damage to her if she doesn't have a cleanser on the team.

MementoMori - Cordie IconCordie

Cordie's active skills, "The Quick & The Dead", and "Fanning Shots" can deal significant burst damage, which is crucial before Eureka applies debuffs and buffs her allies with a [Shield]. She also has the skill to decrease Eureka's DEF by 80%. Her "Smoke and Gunpowder" skill provides immunity to debuffs, which can make [X Mark] debuff useless against Cordie. Cordie can increase ATK and DEF Break, which enhances her overall damage output.

MementoMori - Witch Illya IconWitch Illya

Witch Illya's skills, especially "God Curses the Light" and "Surge of Providence" can deal significant damage, which is crucial if Eureka has high HP or strong defenses. If Eureka is debuffed, Illya's damage becomes multiplied against debuffed targets. She can also reduce damage and can survive fatal hits to help her endure Eureka's attacks. If Eureka's team relies on buffs for defense or offense, Illya can dispel buffs that can neutralize those advantages given that they are dispellable.

Eureka General Counters

MementoMori - Serruria IconSerruria MementoMori - Apostle Rosalie IconApostle Rosalie MementoMori - Fortina IconFortina
MementoMori - Summer Amleth IconSummer Amleth MementoMori - Merlyn IconMerlyn MementoMori - Nina IconNina
MementoMori - Lea IconLea MementoMori - Priscilla IconPriscilla MementoMori - Rusalka IconRusalka

Eureka Sample Counter Teams

High Damage and Debuff Removal

Debuffer Attacker Buffer Attacker Healer
MementoMori - Nina IconNina MementoMori - Serruria IconSerruria MementoMori - Merlyn IconMerlyn MementoMori - Summer Amleth IconSummer Amleth MementoMori - Fortina IconFortina

Nina and Serruria can deal significant damage to multiple enemies, especially when their conditions are met. They also have self-sustain abilities to help them survive through tough abilities. Summer Amleth's high attack speed and critical hit chance allow her to deal rapid, powerful attacks. Fortina's healing abilities can keep the teamalive and protected. Merlyn's dispeling abilities can remove harmful debuffs from allies and her healing can sustain the team.

Burst Damage Team

Buffer Attacker Buffer Attacker/Debuffer Debuffer
MementoMori - Apostle Rosalie IconApostle Rosalie MementoMori - Witch Illya IconWitch Illya MementoMori - Merlyn IconMerlyn MementoMori - Cordie IconCordie MementoMori - Rusalka IconRusalka

Cordie's rapid-fire attacks, and Witch Illya's burst damage, and Apostle Rosalie's attacks can quickly deplate Eureka's HP before she can fully reach her potential. Merlyn's dispelling abilities can remove harmful debuffs, such as the [X Mark], which significantly reduces the damage dealt by enemies.The team's strong defensive capabilities, including Rusalka's protective buffs, Merlyn's healing, and Witch Illya's defensive abilities, can help them withstand attacks.

Witches Not To Use Against Eureka

MementoMori - Florence IconFlorence

Squishy Characters. If Eureka is built well, she can overwhelm characters who have high damage output but low defense and HP. Eureka can quickly eliminate these characters before they have a chance to make a significant impact.

MementoMori - Amour IconAmour

Slow Characters may struggle to keep up with Eureka's SPD and control abilities. This can make it difficult for these characters to respond effectively to Eureka's attacks and debuff, leaving them at a disadvantage, unless they are more advantageous slow than not.

Tips for Beating Eureka

Prioritize Debuff Removal

Make sure to use characters with debuff cleansing abilities to remove the [X Mark] debuff from your team. Characters like Priscilla, Witch Illya, and Sivi have abilities to cleanse debuffs.

Focus Fire

Concentrate your team's attacks on Eureka to eliminate her quickly before she can activate her powerful skills. Use characters who attacks the enemy in front of them like Primavera and Eir.

Utilize Damage Reduction

Employ characters with damage reduction abilities or [Shield] or [Multi-Barrier] to protect your team from incoming attacks.

MementoMori Related Guides

Garmr - MementoMori

List of All Character Builds List of All Character Profiles
List of All How to Beat Articles

Character Build Lists

Character Builds by Rarity
SR Characters R Characters
N Characters
Character Builds by Soul
Azure Characters Crimson Characters
Amber Characters Emerald Characters
Radiance Characters Chaos Characters
Character Builds by Type
Warrior Type Sniper Type
Sorcerer Type

All SR Rarity Character Builds

Soltina - MementoMoriSoltina Amleth - MementoMoriAmleth Fenrir - MementoMoriFenrir Florence - MementoMoriFlorence
Moddey - MementoMoriModdey Sabrina - MementoMoriSabrina Freesia - MementoMoriFreesia Amour - MementoMoriAmour
Rean - MementoMoriRean Dian - MementoMoriDian Ivy - MementoMoriIvy Merlyn - MementoMoriMerlyn
Cordie - MementoMoriCordie Nina - MementoMoriNina Mertillier - MementoMoriMertillier Mimi - MementoMoriMimi
Tropon - MementoMoriTropon Hathor - MementoMoriHathor Olivia - MementoMoriOlivia Primavera - MementoMoriPrimavera
Natasha - MementoMoriNatasha Lunalynn - MementoMoriLunalynn

All SR (Limited) Rarity Character Builds

Sage Merlyn - MementoMoriSage Merlyn Tillie - MementoMoriTillie Asahi - MementoMoriAsahi Artoria - MementoMoriArtoria
Eirene - MementoMoriEirene Winter Lunalynn - MementoMoriWinter Lunalynn Winter Soltina - MementoMoriWinter Soltina Eureka - MementoMoriEureka
Festive Natasha - MementoMoriFestive Natasha Meria - MementoMoriMeria Tama - MementoMoriTama Serruria - MementoMoriSerruria
Aine - MementoMoriAine Milla - MementoMoriMilla Summer Amleth - MementoMoriSummer Amleth Summer Nina - MementoMoriSummer Nina
Kaguya - MementoMoriKaguya Minasumari - MementoMoriMinasumari Alexandra - MementoMoriAlexandra Apostle Rosalie - MementoMoriApostle Rosalie
Lumica - MementoMoriLumica Ayse - MementoMoriAyse Treasured Cerberus - MementoMoriTreasured Cerberus Treasured Fenrir - MementoMoriTreasured Fenrir
Liebe - MementoMoriLiebe Mihri - MementoMoriMihri Carmilla - MementoMoriCarmilla Yildiz - MementoMoriYildiz
Ringmaster Cordie - MementoMoriRingmaster Cordie Nebra - MementoMoriNebra Spring Shizu - MementoMoriSpring Shizu Flack - MementoMoriFlack
Moineau - MementoMoriMoineau Lucille - MementoMoriLucille Uniform A.A. - MementoMoriUniform A.A. D.D. - MementoMoriD.D.
Potpourri - MementoMoriPotpourri Pola - MementoMoriPola Rustica - MementoMoriRustica Morgana - MementoMoriMorgana
Eir - MementoMoriEir Paladea - MementoMoriPaladea Yuni - MementoMoriYuni Matilda - MementoMoriMatilda
Liselotte - MementoMoriLiselotte Fenny - MementoMoriFenny Gil’uial - MementoMoriGil’uial Winter Tropon - MementoMoriWinter Tropon
Sonya - MementoMoriSonya Stella - MementoMoriStella Sivi - MementoMoriSivi Summer Cordie - MementoMoriSummer Cordie
Priscilla - MementoMoriPriscilla Artie - MementoMoriArtie Chiffon - MementoMoriChiffon Belle - MementoMoriBelle
Luke - MementoMoriLuke Claudia - MementoMoriClaudia Summer Sabrina - MementoMoriSummer Sabrina Fia - MementoMoriFia
Lea - MementoMoriLea Sophia - MementoMoriSophia Carol - MementoMoriCarol Veela - MementoMoriVeela
Winter Amour - MementoMoriWinter Amour Tainted Iris - MementoMoriTainted Iris Richesse - MementoMoriRichesse Summer Moddey - MementoMoriSummer Moddey
Fortina - MementoMoriFortina Elfriede - MementoMoriElfriede Rusalka - MementoMoriRusalka Cerberus - MementoMoriCerberus
Armstrong - MementoMoriArmstrong Ophelia - MementoMoriOphelia A.A. - MementoMoriA.A. Valeriede - MementoMoriValeriede
Witch Illya - MementoMoriWitch Illya

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