The Sealed Sinner’s Prison is a location on Hellgondo, found far in the east. It was created by Ilias and seals those who revolted against her. The ultimate punishment: to be unable to reincarnate and remain sealed for all eternity. Heinrich’s name is inscribed on the jail, which suggests that he went against Ilias and sealed his own fate.
Due to the way it contains its prisoners it does not look like a traditional prison, but as some sort of simple monument with a central altar where the name of it's captive is inscribed. How the prison works is uncertain, however the mechanism seems quite strong as Heinrich is still sealed within despite the building being in ruins.
The prison was foreshadowed when Luka and Alice arrive at San Ilia Castle. When Luka talks about Ilias’s third commandment, Alice mentions a rumor about human souls being sealed when they break her commandments.
When they arrive in Hellgondo, Alice explains the purpose of the prison and is simply an area to fuel Luka’s curiosity, though he feels that something in there is calling out to him.
According to Alice, monsters don’t bother nearing the prison, however this doesn’t stop a Vampire or a Behemoth attacking en-route. That said, no monsters actually appear at the monument itself.
Upon entering the prison, Sylph is unexpectedly in a good mood as the place smells like her former master. They then notice the inscription on the monument: Heinrich Hein. This leaves them to wonder what truly happened to him, as according to legend, Ilias brought him to heaven. Their only conclusion was that he rebelled against her. Luka is in complete disbelief, but Alice tells him that standing around won’t bring any answers. As they leave, the Angel Halo suddenly shines with light then fades, seemingly reacting to some form of presence in the prison.
In Chapter 3, Tamamo finds out through Promestein's discs that there's a worldwide seal deployed on four towers that weakens the Four Spirits, preventing Luka from unleashing his full power. She then devises a plan such that they can replace that seal on the spirits with a seal that weakens the holy energy of the angels, making them vulnerable. She tasks Luka and Alice to copy the data of the holy seal on Heinrich in the Sealed Sinner's Prison.
As the two protagonists arrive there, Black Alice appears, who then faced Luka for fun and didn't fight seriously while Alice is busy copying the seal. Luka defeats Black Alice, afterwards a huge army of angels come to prevent the two from getting their objective. Just then, the soul of Heinrich appears. Apparently the data copy Alice is performing has weakened his seal. Heinrich proves his might as a Hero and an "Angel Killer" by defeating the angels one by one. More angels come up, getting them surrounded. Heinrich asks Luka to lend his body to him, and Heinrich starts performing exceptional sword skills with the power of the Spirits in Luka. He then uses Element Spica and an even more powerful Quadruple Giga, leaving Luka stunned. Afterwards, Heinrich explains that he must leave now, making Luka disappointed. Heinrich just says that his soul won't be gone and will continue on in Luka's heart. Luka promises that he will, swearing to his blade. The legendary hero says Luka must not do that, because a Hero has two duties; to protect the people in need and to return to the people who cheer and wait for him. Heinrich departs, with his soul finally achieving peace. Luka is left still dumbfounded about the idea of the Hero's Soul he must inherit.
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