MementoMori's Mertillier 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.

Mertillier
Best Builds	How to Beat
Story and Profile

How to Beat Mertillier

How to Beat Mertillier Overview

Mertillier
PvE Rank	PvP Rank

Base Rarity	Soul	Type	Role
SR	Emerald	Sorcerer	Buffer

Mertillier is a buffer with potent offensive and defensive capabilities. Her Life Conversion delivers substantial magical damage while granting her a shield, making her a formidable attacker. Homunculus Body and Fruits of Research significantly enhance her survivability through self-healing, stealth, and debuff resistance. Maintenance provides support by reducing cooldown and boosting ATK for allies, however, this skill only triggers on the second turn.

Mertillier Strengths and Weaknesses

Strengths	Weaknesses
• Skill cooldown and ATK Buff • AoE Attack • Durability	• Reliance on HP threshold • Weaker damage • Self-centered buff except for Maintenance

Mertillier Skill Analysis

Life Conversion

Maintenance

Life Conversion is a high-damage, versatile skill that deals magical damage to multiple enemies while providing a shield for Mertillier. However, its random targeting can be unpredictable.

Maintenance is a supportive skill that offers cooldown reduction, ATK boost, and debuff removal for a single ally, making it beneficial for high-ATK characters.

Homunculus Body

Fruits of Research

Homunculus Body is a powerful defensive skill that provides strong survivability for Mertillier. By granting Regeneration and, at higher levels, Stealth, it significantly increases her ability to endure damage. However, its activation is tied to low HP, making it reactive rather than proactive.

Fruits of Research is a purely defensive skill that offers increasing resistance to debuffs, culminating in complete immunity at the highest level. This makes Mertillier highly resistant to negative effects.

Witches to Beat Mertillier

Mertillier Hard Counters

Rusalka

Rusalka's skillset allows her to debuff, deal damage overtime and survive damage given by Mertillier. Kikimora's Downpour can inflict Decreased Damage Dealing, which directly counters Mertillier's damage output.

Vodnik's Mire Dragon deals increased damage to debuffed targets, which can counter Mertillier's self-healing. Her Maiden of Sacrifice provides a safety net with revival and barriers allowing Rusalka to sustain damage.

Soltina

Soltina's skillset is well-suited to counter Mertillier. Snow Dream can reduce enemy critical hit chance and inflict sleep, while Ice Spine inflict Fainted. The same skills can target multiple enemies, potentially disrupting Mertillier's actions.

My Stuffed Bear and Sisterly Bond provide protection against debuffs and damage. Overall, her ability to debuff, control the battlefield and survive makes her a strong counterpick.

Paladea

Paladea's skillset focuses on high damage output, debuffing and survivability, which directly counters Mertillier's strengths. Both Black Flames of Justice and Bullet Storm can deal massive damage to multiple enemies. The same skills also reduce enemy critical hit chance, and can dispel enemy buffs.

Aside from that, Paladea also has a skill that grants her shield, damage reduction and an increase in her critical hit chance.

Mertillier General Counters

Primavera	Florence	Cordie
Lunalynn	Fenny	Hathor
Nina	Artie	Eir

Mertillier Sample Counter Teams

High Damage Output Team

Attacker	Debuffer	Debuffer	Attacker	Debuffer
Florence	Soltina	Eir	Paladea	Fenny

Florence, Paladea, and Eir are all known for their high damage potential. This combined firepower can quickly overwhelm Mertillier before she can activate her defensive abilities. Fenny and Soltina excel at applying debuffs, which can significantly reduce Mertillier's effectiveness.

Eir's Silver Weaver can disrupt Mertillier's actions by targeting enemies with debuffs. Paladea's Supreme Commander and Eir's Hunter's Integrity provide a degree of survivability, which is essential when facing a durable opponent like Mertillier.

Witches Not To Use Against Mertillier

Freesia

Pure Support Characters: Characters primarily focused on healing or buffing allies might not be as effective against Mertillier, as she has strong defensive capabilities and can deal significant damage.

Morgana

Self-Damaging Characters: Mertillier's damage output can be substantial, so characters with low health pools might struggle to survive her attacks.

Tips for Beating Mertillier

Use Characters with High Damage Output

Overwhelming Mertillier with damage can help defeat her before she can activate her defensive abilities. Since Mertillier had cooldown for her skills, it would be best to use characters that can damage her before she can use her shield or buffs.

Add Debuffers or Damage-Over-Time Characters

If you don't have a way to overwhelm Mertillier with damage, you can use characters who can inflict multiple debuffs or DoT to her so that she loses durability overtime. Charactrs who can also apply persistent damage can bypass Mertillier's self-healing and gradually wear her down.

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