Louis is a boss that can be fought in the Montario Opera House in Metaphor: Refantazio. Read on to learn how to beat Louis, their weaknesses, rewards, as well as the recommended party setup and Archetypes to use against Louis.

Louis Overview and Rewards

Louis Guiabern Availability and Location

Louis Guiabern Boss
Availability	Level	Location
09/10	55	Montario Opera House

You will face Louis Guiabern in the Montario Opera House as part of the main story after completing the Eliminate Virga Island's Threat main quest.

Montario Opera House Walkthrough Guide

Louis Guiabern Rewards

At the end of a battle, receiving a Spoil slightly reduces the EXP and A-EXP gained. If no Spoil is obtained, you'll receive the regular amount of EXP and A-EXP.

Louis Weakness and Resistances

All Elemental Weakness, Affinities and Resistances

Lord Louis has no weaknesses or resistances, which makes the fight more straightforward and easier to strategize.

Recommended Party Setup Against Louis

Junah, Hulkenberg, Heismay

Character	Explanation
Protagonist	The Protagonist will take on a supportive role using the Trickster Archetype, focusing on debuffing Louis with Vidyartha and healing the party with Medicall, inherited from the Savior Archetype.
Junah	Since Louis has no natural Weaknesses or Resistances, Junah, using the Masked Dancer Archetype, can employ the Thief-Masked Dancer Synthesis Skill, Sable Dance, to give Louis a weakness to Dark.
Hulkenberg	Hulkenberg will be the Magic Knight and deal damage via Synthesis Skills and protect the team with Rakukaja and Matarukaja inherited from the General Archetype.
Heismay	Heismay will be the Assassin. Once Junah gives Louis a weakness to Dark, Heismay can use Assassinate to deal significant damage.

Recommended Archetypes Against Louis

Best Archetypes to Equip

Archetype	Recommended Skills
Trickster	・Dodge ・Debilitate ・Vidyartha
Masked Dancer	・Sable Dance
Magic Knight	・Auto-Repel ・Rakukaja ・Mediline ・Magic Knight's Hammer
Assassin	・Assassinate ・Godkiller

With the Protagonist as the Trickster, his role will focus on supporting and healing the team rather than dealing damage. The Masked Dancer will create an opportunity by granting Louis a weakness to Dark, allowing the Assassin to exploit this weakness and deal significant Dark damage.

The Magic Knight will focus on buffing the party's attack and defense to keep everyone protected during the fight.

All Archetypes and How to Unlock

How to Beat Louis

How to Beat Louis Guiabern
Louis Will Always Target the Protagonist Debuff Him and Buff the Party Before Attacking Give Louis A Weakness to Dark Use Synthesis Skills

Louis Will Always Target the Protagonist

Louis will primarily focus his attacks and debuffs on the Protagonist. Because of this, it's better to assign the Protagonist a support role, healing and debuffing rather than dealing damage.

Louis' Royal Coercion skill lowers the Protagonist's Attack and Defense, so keeping the Protagonist offensive isn't efficient.

Debuff Him and Buff the Party Before Attacking

Before launching any offensive moves, debuff Louis. The Protagonist should use Vidyartha to lower Louis' Attack and Defense.

Meanwhile, have the party buff their own Offense and Defense using skills like Matarukaja and Rakukaja from Hulkenberg. This setup will ensure your team stays strong while weakening Louis.

List of All Support Skills

Give Louis A Weakness to Dark

Since Louis has no inherent weaknesses or resistances, use Junah's Sable Dance Synthesis Skill to give him a weakness to Dark.

Once he is vulnerable, Heismay can target Louis with powerful Dark abilities like Assassinate or Godkiller for massive damage.

List of All Dark Skills

Use Synthesis Skills

While Synthesis Skills are powerful, they consume two turn icons, so use them strategically.

Hulkenberg’s Magic Knight's Hammer and Heismay's Godkiller are highly effective but should be saved for optimal moments to maximize their impact on the battle.

Synthesis Skills Explained

Metaphor: ReFantazio Related Guides

List of All Bosses

All Story Bosses

List of Bosses
Homo Gorleo	Captain Klinger	Homo Fulquilo
Undead Grius	Zorba	Homo Avades
Monk Captain Gideaux	Greatworm Homo Butera	Heismay
Homo Jaluzo	Sergeant Xanth	Maintenance Chief Ceiba
Master Sergeant Glechom	Helmsman Cabio and Grand Chief Salva	Glodell
Sea Horror Homo Sabara	Treebeast Alento	Malvirta Drako Eht
Homo Margo	Louis Guiabern	Sogne the Icebound
Homo Gorleo (Second Fight)	Melancholia Zorba	Diabolus Gorleo
Diabolus Avades	Diabolus Butera	Diabolus Jaluzo
Diabolus Sabara	Diabolus Margo	Archdemon Louis Charadrius
More	Destroyer Charadrius

All Optional Bosses

List of Bosses
Fire Dragon Mauna	Grotesque Guptauros	Maneater Manjula
Catherina the Bounty Queen	Goborn King	Demo Man Goddard
Alpha Rockworm Valmo	Kadablich	Roger the Libertarian
Lina the Machinist	Trove Imitec	Fatolich
Kokasados	Orgas	Kokasadors
Homo Pento	Psyocropos	Leogron
Milo the Adonis	Rudolf the Roussainte Lion	Icebeast Chimenzahn
Ziocropos	Ordemos	Mad Sanctor Hyperic
Jin the Charlatan	Serial Killer Vinca	Kokamordos
Bandit Chief Cistus	Homo Sandro	Devourer of Nations
Devourer of Stars	Devourer of Flames	Elegy of the Souls
Redscale Apocalypse Dragon