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.

Eureka
Best Builds	How To Beat
Story and Profile

How to Beat Eureka

How to Beat Eureka Overview

Eureka
PvE Rank	PvP Rank

Base Rarity	Soul	Type	Role
SR (Limited)	Azure	Sorcerer	Attacker/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

Carrot Magic

My Own Eureka Pace

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.

On To New Frontiers

Dreamy Adventurer

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

Lunalynn

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.

Cordie

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.

Witch 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

Serruria	Apostle Rosalie	Fortina
Summer Amleth	Merlyn	Nina
Lea	Priscilla	Rusalka

Eureka Sample Counter Teams

High Damage and Debuff Removal

Debuffer	Attacker	Buffer	Attacker	Healer
Nina	Serruria	Merlyn	Summer Amleth	Fortina

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
Apostle Rosalie	Witch Illya	Merlyn	Cordie	Rusalka

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

Florence

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.

Amour

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

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	Amleth	Fenrir
Florence	Moddey	Sabrina
Freesia	Amour	Rean
Dian	Ivy	Merlyn
Cordie	Nina	Mertillier
Mimi	Tropon	Hathor
Olivia	Primavera	Natasha
Lunalynn

All SR (Limited) Rarity Character Builds

Milla	Paladea	Eir
Morgana	Apostle Rosalie	Asahi
Alexandra	Minasumari	Kaguya
Summer Nina	Summer Amleth	Yuni
Aine	Serruria	Liselotte
Tama	Meria	Festive Natasha
Eureka	Winter Soltina	Winter Lunalynn
Eirene	Matilda	Sonya
Gil’uial	Winter Tropon	Sivi
Stella	Fenny	Summer Cordie
Belle	Priscilla	Artie
Chiffon	Claudia	Luke
Summer Sabrina	Fia	Lea
Sophia	Summer Moddey	Tainted Iris
Richesse	Veela	Carol
Winter Amour	Elfriede	Rusalka
Cerberus	Fortina	Armstrong
Ophelia	A.A.	Valeriede
Witch Illya