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Thales is the leader of Those Who Slither in the Dark and the main antagonist in Fire Emblem: Three Houses, being Solon and Kronya's leader as well as the employer of the Flame Emperor. He is also behind every tragedy happened in the entire game.

He is the main antagonist in the first half of the game, also known as the Acadamy Phase. Post-timeskip, depending on player's choice, he becomes a supporting character in the Black Eagle route (as Lord Arundel), a major antagonist in Blue Lion route (as Lord Arundel), the main antagonist in the Church of Seiros route (as Thales) and the secondary antagonist in Golden Deer route (as Thales).

He is voiced by Masaki Terasoma in Japanese version, and by Christopher Corey Smith (credicted as Chris Smith) in English version with the latter also voiced Slayde in Fire Emblem Echoes: Shadows of Valentia, and Legion and Reinhardt in Fire Emblem Heroes.


Thales is a priest of Agartha and one of Those Who Slither in the Dark. In order to carry out his master plan, he acts in the shadows of Fódlan under the disguise of Lord Volkhard von Arundel, uncle of Edelgard von Hresvelg and step-uncle of Dimitri Alexandre Blaiddyd. He is also responsible for the tragedy in Edelgard's family by the Crest experiment on her and her sister.

The truth behind the Tragedy of Duscur is revealed when Edelgard and Hubert, in the Black Eagle route, revealed to Byleth that Volkhard and Thales are one and the same, being the one with Those Who Slither in the Dark. He composed the Tragedy of Duscur in order to destabilize Faerghus and make it easier for Cornelia Arnim, another of his agent, to gain a foothold in the Kingdom's affairs.

Academy Route

Thales first appears in the Acadamy Phase as soon as the plot twist happened when Jeralt is killed by Kronya, disguised as Monica. Trying to save their father, Byleth to use Divine Pulse to rewind time. However, just as they draw the Sword of the Creator to intercept Kronya, Thales teleports in and blocks the attack, leaving Jeralt's assassination an inescapable fate.

After Jeralt's death, Thales and Kronya met the Flame Emperor, who was clearly disgusted by their crimes in spite of being their working partner.

Post-Acadamy Phase

Black Eagle

Blue Lion

Golden Deer

Church of Seiros



  • It is unclear if there was an original Volkhard whom Thales replaced just as Solon replaced Tomas and Kronya replaced Monica von Ochs, or if the identity of Volkhard was fabricated.


           Fireemblem Villains

Archanea Series

Jiol | Camus | Michalis | Morzas | Gharnef | Medeus

Fire Emblem Gaiden & Echoes: Shadows of Valentia

Rigel Empire
Rudolf | Berkut

Duma Faithful
Duma | Jedah | Nuibaba

Zofia Kingdom
Desaix | Slayde

Grieth's Army

Jugdral Series

Duke Bloom of Friege | Reptor | Queen Hilda | Ishtar | Ishtore | Kempf of Friege | Reinhardt

Travant | Arion

Daccar | Maios | Pamela | Donovan| Deet'var

Loptous Sect
Bishop Manfory | Julius | Arvis | Veld

Elibe Series

Zephiel | Idunn

Black Fang
Nergal | Sonia Reed | Ephidel | Limstella | Denning | Kishuna | Four Fangs (Jaffar the Angel of Death | Lloyd Reed the White Wolf | Linus Reed the Mad Dog | Ursula the Blue Crow) | Brendan Reed | Uhai | Kenneth | Jerme

Brunya | Murdock | Narcian | Galle

Fire Emblem: The Sacred Stones

Fomortiis | Lyon | Vigarde | Valter | Selena | Caellach | Orson

Tellius Series

Ashnard | Black Knight | Bryce | Petrine | Bertram | Izuka | Ashera

Kilvas (Nasala | Seeker) | Oliver | Sephiran | Vice-Minister Lekain

Fire Emblem Awakening

Grima | Theocracy of Plegia (Gangrel) | Valmese Empire (Walhart) | Grimleal (Validar | Algol)

Fire Emblem Fates

Garon | Iago | Hans | Anankos

Fire Emblem Warriors

Validar | Iago | Gharnef | King Oskar | Darios | Velezark

Tokyo Mirage Sessions ♯FE

Garrick | Aversa | Gangrel | Abel | Lon'qu | Excellus | Lorenz | Dark Yashiro | Dolph | Gordin | Linde | Macellan | Ogma | Palla | Jagen | Gharnef | Pheros | Cervantes | Medeus | M-DEUS

Fire Emblem Heroes

Book 1 - Emblian Empire
Princess Veronica | Mysterious Man

Book 2 - Múspell
Surtr | Laevatein | Laegjarn | Helbindi

Book 3 - Hel
Hel | Líf | Thrasir | Gustav

Book 4 - Dökkálfheimr

Freyja | Triandra | Plumeria

Loki | Arvis | Black Knight | Brunya | Camus | Death Knight | Edelgard | Gharnef | Grima | Jaffar | Linus Reed | Lloyd Reed | Kronya | Lyon | Ursula

Fire Emblem: Three Houses

Those Who Slither in the Dark
Thales | Solon | Kronya | Flame Emperor | Death Knight | Cornelia Arnim | Nemesis

Church of Seiros
Seiros | Aelfric

Duke Aegir | Miklan Andchutx Gautier

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