Mertillier Builds: Best Runes and Team Comps

MementoMori's Mertillier is an Emerald Soul Sorcerer-type SR Rarity Witch. Learn about her basic info, skills, which gacha you can get her, or listen to her lament below!

Mertillier
Best Builds	Story and Profile

Mertillier Basic Info

Mertillier Overview

Mertillier
PvE Rank	PvP Rank

Base Rarity	Soul	Type	Role
SR	Emerald	Sorcerer	Buffer

Mertillier Analysis

Great Buffer Skill

Maintenance

Mertillier's best skill is undoubtedly 'Maintenance,' which at Level 2 boosts the ATK of the ally with the highest ATK by 65% for three turns. This is on top of shortening their skill's cooldown period. This is why having her in a party with Merlyn, Florence, and/or Cordie can result in very high amounts of damage.

Good Tanking Abilities

Life Conversion

Homunculus Body

Adding to Mertilier's utility is her ability to grant herself Shields to withstand enemy attacks as well as heal herself. This should keep her alive for long enough to use her Maintenance skill and give your main attacker that huge ATK buff.

Mertillier Best Runes

Give Mertillier SPD, MAG, DEF, EVD, and CRIT RES Runes

The best runes you can give Mertillier are SPD, ATK, MAG, and CRIT (for offensive runes). You can trade the CRIT for PM. DEF Break runes if you can spare them, but otherwise it's better to give them to your main attackers.

For defensive runes, give Mert your P. DEF and M. DEF runes, as well as EVD and CRIT RES runes. Her passive skill 'Fruits of Research' should already give her very high Debuff RES buffs so you can give runes for that stat to another witch instead.

Mertillier Best Team Comps

ATK Overdrive Team (PvE)

Buffer	Attacker	Buffer	Buffer	Debuffer
Merlyn	Cordie	Mertillier	Olivia	Primavera

It's good to pair Mertillier with main attackers like Cordie and Florence because her Maintenance skill will shoot their ATK stats into overdrive. Pair that with buffs from Olivia and Primavera, and you'll have very high damage outputs.

We put Cordie in here in place of Florence for the sake of getting a Soul Bonus, but you can definitely swap her with Florence. Olivia and Primavera can also be swapped out for other witches too depending on the situation.

Mertillier Skills and Stats

Life Conversion

Skill	Type	Cooldown
Life Conversion	Active Magical Attack/Buff	4

Skill Effect

Level 1 (Unlocks by default) Mertillier will use any power she can to protect A.A.—even the power of demons. Deals 1 magical attack equal to 290% of her ATK to 4 random enemies, and grants Mertillier ［Shield］equal to 25% of this skill’s total damage for 3 turns. Level 2 (Unlocks by level 81) The magical attack’s damage becomes equal to 350% of her ATK. Level 3 (Unlocks by level 161) The size of［Shield］becomes equal to 40% of this skill’s total damage.

Maintenance

Skill	Type	Cooldown
Maintenance	Active Buff	4

Skill Effect

Level 1 (Unlocks by level 11) If there’s anything wrong with A.A., no matter how slight the change is, Mertillier won’t fail to see it. She understands “life” more than anyone else and utilizes her expertise, decreasing the skill cooldown time of the ally with the highest ATK by 1. Level 2 (Unlocks by level 21) Additionally increases the target’s ATK by 65% for 3 turns. Level 3 (Unlocks by level 101) Additionally, if the target is afflicted with a debuff, all their debuffs are dispelled. Level 4 (Unlocks by level 181) The amount the target’s skill cooldown time decreases by becomes 2.

Homunculus Body

Skill	Type	Cooldown
Homunculus Body	Passive Heal	-

Skill Effect

Level 1 (Unlocks by level 41) Mertillier created her homunculus body so she can protect her dear A.A. At the start of each turn or when Mertillier is attacked, if her remaining HP percentage is below 40%, this skill grants ［Regeneration］to her for 4 turns (cannot be dispelled). Each turn, at the start of the action phase, ［Regeneration］restores HP equal to 15% of Mertillier’s max HP to her. Level 2 (Unlocks by level 121) The amount［Regeneration］restores Mertillier’s HP by becomes equal to 20% of her max HP. Level 3 (Unlocks by level 201) Additionally grants［Stealth］to her for 4 turns (cannot be dispelled).

Fruits of Research

Skill	Type	Cooldown
Fruits of Research	Passive Buff	-

Skill Effect
Level 1 (Unlocks by level 61) Mertillier has applied everything she learned from many years of homunculus research onto her own body. Increases her chance to resist a debuff by 30% (cannot be dispelled). Level 2 (Unlocks by level 141) The increase in her chance to resist a debuff becomes 50%. Level 3 (Unlocks by level 221) The increase in her chance to resist a debuff becomes 100%.

Mertillier Stats and Potential

Max Stats (Lv. 240)

HP	5194149
DEF	10
DEF Break	0
SPD	2796
PM. DEF Break	0
P. DEF	596625
M. DEF	659800
ACC	298313
EVD	298313
CRIT	298312
CRIT RES	259707
CRT DMG Boost	0
P. CRIT DMG Cut	0
M. CRIT DMG Cut	0
Debuff ACC	329898
Debuff RES	0
Counter	0
HP Drain	0

Max Potential (Lv. 240)

STR	596625
MAG	659797
DEX	596625
STA	519415

LR+5 Rarity Stats

These are the LR+5 Stats for Player Rank 132 at Max Lvl 255. These stats may still improve with Player Ranking, Party Level Link and Gear and Rune Enhancement.

HP	8657796
ATK	1095177
DEF	10
DEF Break	0
SPD	2796
PM. DEF Break	0
P. DEF	956926
M. DEF	1058250
ACC	478464
EVD	478464
CRIT	478463
CRIT RES	416544
CRT DMG Boost	0.00%
P. CRIT DMG Cut	0.00%
M. CRIT DMG Cut	0.00%
Debuff ACC	529123
Debuff RES	150
Counter	0.00%
HP Drain	0.00%

LR+5 Potential Stats

STR	956926
MAG	1058247
DEX	956926
STA	833088

Mertillier Exclusive Weapon

Archeus Principle

Level 1 (Unlocked by getting Mertiller's Unique Weapon) Strengthens Life Conversion. The magical attack’s damage becomes equal to 410% of her ATK. Level 2 (Unlocks at UR rarity) Strengthens Maintenance. The amount the target's ATK increases by becomes 85% Level 3 (Unlocks at LR rarity) Strengthens Maintenance. Additionally increases the DEF of the ally with the highest ATK by 65% for 3 turns.

Mertillier Available Gachas

Mertillier Invoke Banners

List of Gacha Banners
Prayer of The Fleeting	Prayer of The Cursed
Prayer of Soul	Prayer of Beginnings

Mertillier Profile and Lament

Mertillier's Information

Height	129 cm	Weight	29 kg
Bloodtype	AB	Birthday	3-Sep
Lament	To the Most Beautiful Miracle of All
Japanese Voice Actor	Asuka Nishi
A former researcher from the Kingdom of Byrune, and the creator of the homunculus A.A. She is gifted with prodigious intellect, having served as Byrune's chief researcher all while existing as a witch. Mertillier loves A.A. as if she were her own daughter.

Mertillier's Lament (Image Song)

To the Most Beautiful Miracle of All (EN Version)
To the Most Beautiful Miracle of All (JP Version)

MementoMori Related Guides

List of All Character Builds

List of All Character Profiles

Character Build Lists

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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

Asahi	Apostle Rosalie	Morgana
Eir	Paladea	Yuni
Matilda	Liselotte	Fenny
Stella	Gil’uial	Winter Tropon
Sivi	Sonya	Summer Cordie
Belle	Priscilla	Artie
Chiffon	Summer Sabrina	Fia
Lea	Luke	Claudia
Sophia	Veela	Summer Moddey
Richesse	Tainted Iris	Winter Amour
Carol	Fortina	Cerberus
Rusalka	Elfriede	Ophelia
Armstrong	Witch Illya	Valeriede
A.A.