Eureka Builds: Best Runes and Team Comps

Eureka is an Azure Soul Sorcerer-type SR (Limited) Rarity Witch in MementoMori. Learn more about this Witch's basic info, skills, arcana, and which gacha you can find her in!

Eureka Basic Info

Eureka Overview

Eureka
PvE Rank	PvP Rank

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

Eureka Analysis

AoE Damage and Damage Cut Debuff

Carrot Magic

My Own Eureka Pace

Carrot Magic is suitable for weakening enemies and reducing the damage they deal. With this skill, Eureka can hit and weaken two random enemies, reducing their damage by 10%. At higher levels, it has an excellent chance to weaken enemies. The damage is relatively low compared to other skills, but its most crucial function is [X Mark].

My Own Eureka Pace is a skill that deals significant damage. If the target is afflicted with [X Mark], the damage skyrockets to 1760% of Eureka's ATK at level 3. At level 4, the kill targets three random enemies, increasing its impact. Its maximum potential is heavily reliant on the presence of the [X Mark] debuff.

Debuff Management

On To New Frontiers

On To New Frontiers helps manage debuffs and weaken enemies. When Eureka gets a debuff, there's a 70% chance that three random enemies will get [X Mark] for two turns. [X Mark] makes enemies deal 10% less damage.

This skill removes one debuff from Eureka and the two allies with the two allies with highest ATK at higher levels. If the debuff is action-hindering, [X Mark] will affect five random enemies instead of 3. Debuffers like Soltina or Lunalynn may endanger their allies using their debuff on Eureka.

Ally Shield for Azure Souls

Dreamy Adventurer

Dreamy Adventurer provides a solid shield to your best attacker when Eureka is defeated. The ally with the highest damage power gets a shield that absorbs damage equal to 150% of Eureka's ATK for four turns. We can also note that you can't dispel or steal this shield.

This shield becomes even more vital if enemies with [X Mark] exist. For each enemy with [X Mark], the shield strength increases by 150% of Eureka's ATK, up to 900%. If the ally who gets the shield is an Azure soul ally, the ATK increases by 50% for four turns.

Eureka Best Runes

Prioritize ATK, Debuff ACC, MAG and HP Runes

Eureka should get the ATK rune since this significantly increases Eureka's ATK power, maximizing the damage output of her active skills. Debuff ACC rune ensures that [X Mark] is applied more consistently, crucial for triggering the massive damage multiplier at higher levels.

MAG rune increases the damage of both Carrot Magic and My Own Eureka Pace, making these skills more powerful. HP rune to help with survivability, ensuring Eureka can stay in the fight longer and make the most of her skills. You can include other defensive runes like M.DEF and CRIT RES.

Eureka Best Team Comps

Azure Soul Affinity Team

Tank	Buffer	Attacker	Debuffer	Debuffer
Amleth	Sivi	Florence	Eureka	Soltina

Amleth and Florence are capable of dealing massive damage to enemies. Sivi's defensive buffs and self-healing abilities ensure the team's survival, especially in long battles. Eureka and Soltina's debuffing abilities can significantly weaken enemies, making them easier to defeat. In addition to these skills, the soul bonus will take effect and have a 25% boost for HP and ATK.

Debuff-Heavy Team

Attacker / Debuffer	Buffer	Attacker	Debuffer	Debuffer
Cordie	Merlyn	Serruria	Eureka	Rusalka

Getting high-damage characters like Cordie and Serruria in a team allows it to deal massive damage to enemies. Merlyn's healing and buffing abilities, combined with Rusalka's protective shields and self-revival, ensure the team's survival. Eureka and Rusalka's debuffing abilities can significantly weaken enemies so that the high-damage characters can finish off the enemy team.

Eureka Skills and Stats

Carrot Magic

Skill	Type	Cooldown
Carrot Magic	Active	4

Skill Effect

Level 1 (Unlocks by default) “No need to panic~ Let’s just take it slow~” 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%.

My Own Eureka Pace

Skill	Type	Cooldown
My Own Eureka Pace	Active	4

Skill Effect

Level 1 (Unlocks by level 11) “I’m gonna take each step at my own Eureka pace~ So, don’t get in my way, okay~?” 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.

On To New Frontiers

Skill	Type	Cooldown
On To New Frontiers	Passive

Skill Effect

Level 1 (Unlocks by level 41) “If an adventurer gives up, their journey ends, after all~” 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.

Dreamy Adventurer

Skill	Type	Cooldown
Dreamy Adventurer	Passive

Skill Effect

Level 1 (Unlocks by level 61) “Keep trying hard for me, too~ I’ll leave the rest to you~” 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).

Eureka Stats and Potential

Max Stats (Lv. 240)

HP	5,410,880
DEF	7
DEF Break	0
SPD	2,895
PM. DEF Break	0
P. DEF	568,836
M. DEF	714,514
ACC	284,418
EVD	274,012
CRIT	274,012
CRIT RES	270,544
CRT DMG Boost	0
P. CRIT DMG Cut	0
M. CRIT DMG Cut	0
Debuff ACC	0
Debuff RES	0
Counter	0
HP Drain	0

Max Potential (Lv. 240)

STR	568,836
MAG	714,514
DEX	548,025
STA	541,088

Eureka Exclusive Weapon

Travel Buddy

Level 1 (Unlocked by getting Eureka's unique weapon) Strengthens Carrot Magic. The targets of this skill become 3 random enemies. Level 2 (Unlocks at UR rarity) At the start of the battle, this skill grants 1 layer of ［Multi-Barrier］ to Eureka (cannot be dispelled). If she takes damage, 1 barrier layer is depleted to nullify the damage. Level 3 (Unlocks at LR rarity) Strengthens My Own Eureka Pace. The magical attack’s damage becomes equal to 480% of her ATK. If a target is afflicted with ［X Mark］, the magical attack’s damage to that target becomes equal to 1920% of Eureka’s ATK.

Eureka Available Gachas

Eureka Invoke Banners

List of Gacha Banners
Prayer of The Fleeting	Invocation of Chance

Eureka Arcana

Lepus 's Detection

Eureka

Tropon

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

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