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The Steel Mill in Arkham City.

The Steel Mill is a factory that was tied to Arkham City by Hugo Strange, and was a part of the Industrial District. During Batman: Arkham City, Joker used the Steel Mill as his main base of operations.

Incident Report

Before Arkham Origins Incident

Before the Incident on Christmas Eve, Black Mask used the Steel Mill as a front for his drug lab that was hidden in the basement. It was known to be part of Roman's business Sionis Steel Works, which was known to have become defunct at some point. Eventually, the Joker arrived, took Roman's alter ego, took over the operation, and prepared his plans against the Dark Knight while he locked Sionis in his own office in the Drug Lab and extracted information from him through torture to learn more about his mannerisms and actions to perfect his disguise.

Arkham Origins Incident

The Steel Mill was Black Mask's base of operations for his crime syndicate. When the Joker kidnapped Black Mask, he took over his organization by impersonating him and hired eight assassins for a $50,000,000 bounty on Batman's head. When Batman discovered the truth at the Gotham Merchant's Bank, Joker imprisoned Black Mask at the Steel Mill. After he broke into the Steel Mill, Batman rescued Black Mask and beat him for information concerning the Joker. Sionis refused to divulge any information, because he had plans to kill the Joker.

Afterwards, Copperhead attacked Batman in Black Mask's Office which resulted in her poisoning him with her venom. During that, Black Mask escaped into the night. That was eight years before the events of Arkham Asylum, so there were no Joker decorations as seen in Arkham City. If one were to explore the Steel Mill after beating the game's main storyline, they would find Joker's Henchmen all over the place. However, if one were to do this during the main storyline, they would find members of Black Mask's Gang.

Arkham City Incident

As aforementioned, the Steel Mill was Joker's base of operations during the Arkham Gang War.

When Batman travelled to the Church to investigate a shot intended for Catwoman, he finds that it was remotely fired by Joker and follows the gun's signal back to the steel mill. When he gets there he finds it and the surrounding Industrial District is swarming with Joker's Henchmen. Batman enters the steel mill via one of its chimney's. When he is searching for Joker, he is knocked unconscious by Harley Quinn. Joker then explains that he is dying of the Titan Disease, and that he has shipped samples of his blood to hospitals in the Gotham area as well as giving Batman some diseased blood too, leaving him with no choice but to help Joker find Mr. Freeze so he can produce a cure. Later in the story, Batman returns after Harley took the cure that Freeze manufactured in the GCPD. Batman has to get into the steel mill a different way than he did before, it is at this time he learns the truth about Protocol 10. With Protocol 10 activated, the steel mill is partially destroyed by TYGER. Joker nearly kills Batman who is incapacitated under rubble, however Talia al Ghul intervenes and offers Joker the eternal life in exchange for Batman's life. Catwoman soon turns up and rescues Batman from the rubble. If Batman returns to the steel mill after Joker's death at the Monarch Theatre, the goons there will comment on recent events and when Batman pushes the button on the musical Harley heads, they have changed to her crying instead.

Harley Quinn's Revenge Incident

Harley Quinn used the steel mill as a hideout two weeks after Arkham City shutdown. The GCPD sent Batman in to smoke her out, but he disappeared for two days. Robin later went to find out what happened to the Dark Knight. It turned out that he was trapped in a small bubble with no air in it inside of a giant Joker robot.

Arkham Knight Incident

The building could be seen in the unaccessible Arkham City when it was seen from high ground. In addition, a drawn version appeared in the Wonderland side mission, with the second fight of the final segment taking place on its front entrance.

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