Here are some spoilers you probably already know about. All of this info came from wikipedia. For those who don't know the spoilers, enjoy reading them. P.S. Sorry the spoilers are so long. ><
Ryner Lute's real name is Feruna Lieutolu, and was born of the Noble House of Lieutolu, but because of a pact made with “The Goddesses (女神 Megami?)", a collective legendary power of existences that devours everything, he lost his memories of his childhood, including his real name and the names of his birth parents. Shortly after that, he was found by the military of a bandit village and is captured to be placed in the military, there he underwent training under Germer Kleisrole (ジェルメ・クレイスロール Jerume Kureisurōru?) alongside Pia and Peria. Moreover, he is regarded as an anomaly because he is the only person to have been able to regain his sanity after losing control of his Alpha Stigma. As such, even after going berserk and killing many innocent, he was allowed to live as a rare research subject. This is mainly because he carries half of the essence ("The Lonely" portion) of the legendary demon lord known as "The Lonely Demon (寂しがりの悪魔 Sabishigari no Akuma?)", which was implanted by his own father, Lieral, in order to save him from what would normally be the doomed fate of an Alpha Stigma bearer. During the battle between Gastark and Geihlficlant, while on the verge of death after losing his Alpha Stigma and arms to Ril, Ryner fully awakens as "The Solver of All Equations (すべての式を解く者 Subete no Shiki o Tokusha?)". His Cursed Eyes becomes its true form, appearing as a rainbow-colored blinking tear-shapes over his eyes. This not only grants him the ability to analyze the structure of magic, but also that of human beings and other physical materials as well, and these include the "equations" (a.k.a structures) of "Rule Fragment (忘却欠片 Rūru Furagume?)" (a.k.a "Relics of Heroes"). He also acquires the ability to traverse into the spirit plane at will. When fully activated it allows him to deconstruct infinite numbers of any object living or inanimate at will, but it requires the sacrifice of the soul belonging to a loved one. And it was revealed to him by his father later on, that the soul of his mother had been the sacrifice during the awakening. Currently, in the latest installation of the novel, his ability is being clouded by Remurus's curse.
After rescuing Ryner from prison, she later defects from Roland with Ryner, Iris, Arua and Kuku and was nearly killed by Froaude if not for Lucile's intervention, before traveling with the Anti Roland Coalition. When Kiefer was later reunited with Ryner, and Ferris becomes aware of Kiefer and Ryner's feelings towards each other, she is shown to be capable of expressing jealousy and has never once called Kiefer directly by her name. [Ferris's sword possesses the "God Devouring (神喰い Kami Kurai?)" power a talisman Ryner's father placed in her sword, which can cut off the demon within Ryner, but with the price being her own life upon invocation. She was requested by Ryner's father to invoke this power to save Ryner when the time arises, and she gave him her word.
Following the awakening of "The Mad Hero" inside Sion, he tries to kill Ryner to prevent "The Mad Hero" from devouring Ryner sending him to hell but fails to do so. Sion then gives his body to "The Mad Hero" who starts conquering other countries. Because of a contract made with "The Mad Hero (狂った勇者 アスルード・ローランド?, Asurūdo Rōrando)", the first King of Roland, enemy of "The Goddesses", "The Mad Hero" now resides in Sion and slowly consumes him from within, gradually leading him to suddenly exhibit moments of a split personality from time to time. In order to reach the territory of "The Goddesses", Sion initiated the invasion of Roland's former allies, which includes Imperial Nelpha and Runa Empire, and conquered the southern part of Menoris. Thereafter, he was betrayed by ally Remurus Empire and lost a part of his land as well as Calne, who appeared to be captured in the battle.
Lucile's real name is Relx Eris (レルクス・エリス Rerukusu Erisu?). After the "God Devouring (神喰い Kami Kurai?)" incantation was implanted into his head by Ryner's father, Lieral, he devoured the "Demon portion" of "The Lonely Demon" which was sealed beneath the Eris's house, thereafter acquiring half of His essence and becoming Lucile Eris, "The Weaver of All Equations (すべての式を編む者 Subete no Shiki o Amu Mono?)". In addition, he also devoured ω (the Curse for erasing "The Weaver of All Equations), made a contract with a thousand demons, and devoured the simulacrum of "The Goddess", and consequently gained an immense amount of power. His body has an ethereal nature and cannot be harmed by even "Rule Fragment" artifacts. However, he is not invincible and cannot yet come close to the level of "The Goddesses" in power. To Ryner's Alpha Stigma, he exists as a void which Ryner claims that it is a binding curse placed on him. Before Sion became king, Lucile tested his "eligibility" to ascend the throne by having him entering a contract with "The Mad Hero", and thereafter backing him in the revolution, which in truth was driven by his own hidden agenda, where he will not hesitate to kill Sion if he (Sion) strays from his (Lucile) intended path. While he can apparently be at anywhere almost instantly within Roland, because of a curse, Lucile's movements are restricted and he is unable to set foot outside the Roland Empire. However, the limitations are correlated to the current boundaries of Roland, and as Roland's boundaries expand, Lucile's ability to move freely expands as well. Lucile normally stays in the shadows, close to Sion whenever he is in Roland, in order to guard him from assassins sent by "The Goddess".
Formerly Duke Lieutolu of Roland, Lieral is the father of Ryner (Feruna Lieutolu). The House of Lieutolu, also called the "Overseer of Magic House Lieutolu", was a major Noble House of Roland, and had a standing matching up to that of the Eris House. Lieral is a genius who created much of the fundamentals of Roland's magic today, and he manages a number of scholars and academics in wizardry to further the advancement of magic. Lieral's flesh body has been infused and permeated with magical energy and like Lucile, he has an ethereal body which made him immune to any form of physical attack. He can alter his physical appearance to assume any age, create simulacrums and projections of himself, and is well versed in various of forms of magic inscriptions and incantations, making him so formidable and powerful that Ferris's strength and movements are like child's play to him. Currently, he is a practitioner of ancient magic and true word magic. However, because his body is almost completely made up of magic, his natural bane are the bearers of the Īno Dwōe (殲滅眼 イーノ・ドゥーエ?, Īno Dwōe). When Īno Dwōe's power is invoked by its bearer, a cross-shaped symbol appears over their pupils, allowing the bearer to absorb magical energy to increase their powers. Since young, Lieral has no interest in anything but magic. However, due to a stroke of coincidence, he bumped into a village girl, Iluna Laswhale (イルナ・ラースウェル Iruna Rāsuweru?), and fell in love at first sight. Subsequently, they were married despite the objections from both families. When he discovered his newly born son was born with the Alpha Stigma, he immersed himself deeply into the research in magic to save Feruna from the doomed fate of an Alpha Stigma bearer. Consequently, he split "The Lonely Demon" into two parts, placing the "Lonely" fragment into Feruna, and the "God Devouring" incantation into the head of Rex Eris. Furthermore, in order to protect Ryner from "α", the Curse of "The Goddess" for erasing "The Solver of All Equations", he infused Iluna's body with magic, and implanted the resulting spiritual existence, "The Charm of Ātofāru (アートファールの呪い Ātofāru no Maginai?)", into Ryner. Furthermore, he first tested the feelings of Ferris for Ryner before affixing the "God Devouring" talisman to her sword.
Due to Lieral's action of splitting and implanting the Lonely Portion into Feruna's body, he is deemed a traitor and has an issued order of assassination by "The Mad Hero". He is also hunted by Tiir of the God's Eyes group as their leader, Enne Lune, states that Lieral will destroy the world.
Iluna Lieutolu :
Maiden name Iluna Laswhale (イルナ・ラースウェル Iruna Rāsuweru?). Formerly a village girl who fell in love with Lieral Lieutolu and later marries him. She eventually gives birth to Feruna Lieutolu (Ryner Lute). When Feruna is discovered to be a bearer of Alpha Stigma, she becomes very depressed blaming herself for falling in love with Lieral who is of high birth. She even attempted a murder and suicide but was stopped by Lieral. She died after having her soul sacrificed during Feruna/Ryner's first awakening.
Despite being dead, she lives inside Ryner as "The Charm of Ātofāru (アートファールの呪い Ātofāru no Maginai?)". When Ryner was stabbed by Lieral, Ryner enters his inner world and meets Iluna. They spent mother and son time as Iluna looks on how much Ryner has grown before being devoured by Alpha after telling Ryner the method of escaping Alpha. She later reappears when "The Mad Hero" attempted to devour Ryner telling him that the time has not arrive. She disappears after Ryner awaken as "The Solver of All Equation" as "α" escapes from Ryner's body
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