Zeldon's Research Facility

Zeldon's Research Facility is an isolated tower situated in the far north of Britannia. Fraudrin as Dreyfus assigned it to be the base of the Pleiades of the Azure Sky.

History
This tower was built on the side of fossil trees on the direct orders of Bartra, probably to prevent against possible invasions of Barbarians by North. After being named Generals of the Holy Knights, Dreyfus and Hendrickson, manipulated by Fraudrin, will "banish" Denzel and his followers there so that they do not oppose their coup against the Royal Family. However, much like Hendrickson conducting experiments to free the Demons from the Coffin of Eternal Darkness, Denzel conducted his own, more "ethical" research to counter them.

Great Fight Festival arc
After being captured by the Pleiades of the Azure, Fraudrin finds himself chained, while Denzel begins his "interrogation" by thrusting a sword "blessed by years of Druid prayers" into his right shoulder. Despite the pain, Fraudrin manages to free himself, but this does not prevent Denzel from wanting to prove that a Human like him can kill a Demon as one of the Ten Commandments, and that even Dreyfus would be happy to make this sacrifice to to redeem from his faults towards the Kingdom of Liones.

While Fraudrin is stuck with Denzel, Waiyo, Deldrey and Arden stand guard with a Spell Ball of Absolute Cancellation which Arden nearly knocks down while playing with it. Luckily, Waiyo picks her up just in time and hands her over to Deldrey "against the promise to marry her". Inside Fraudrin fights a saber with Denzel, but when he wants to unleash his Blade of the Milky Way, his attack finds himself delayed by Death-Pierce's Melody. This is where Fraudrin realizes he is trapped with Denzel and Death-Pierce by a Perfect Cube.

When Arden suggests that Waiyo and Deldrey go to Vaizel to participate in the Grand Tournament, Graylord, transformed into Doggett, comes to see them pretending to want to take over the guard, and recovers the Spell Ball of Absolute Cancellation which she uses immediately to break the Perfect Cube. On the way to Vaizel, Waiyo, Deldrey, and Arden are shocked to spot the real Doggett and immediately decide to turn around to go help Denzel and Death-Pierce. With Graylord's arrival, Fraudrin says he is ready to resume the fight against Denzel and Death-Pierce, but unwilling to risk falling victim to the Precept of Mercy, Denzel agrees to let both Commandments go, despite protests of Deayh-Pierce. As Fraudrin and Graylord leave, they run into the other Pleiades of the Azure, and Fraudrin takes the opportunity to stab Deldrey, now that the latter's Amorous Attraction no longer works on him.

Before leaving, Fraudrin reveals that he is only an "honorary" member of the Commandments, assigned to replace "father" Gowther whose Precept of Altruism had been lost during the First Holy War. Denzel believes he is talking about Gowther "son", who is part of the Seven Deadly Sins, but rather than give any further details, Fraudrin chooses to kill the Pleiades of the Azure by pulverizing Zeldon, but they are all saved just in time. rubble time by Doggett's Boost.