Arkham Asylum

Arkham Asylum was Amadeus Arkham's childhood home. After his mother's death, Arkham turns the house into a home for the criminally insane. Rumors persist about the sinister house as being haunted or evil. During the novel, the inmates take over Arkham Asylum in order to force Batman to come into the asylum.

The Wedding Dress

After Amadeus Arkham's wife and child are killed by a lunatic that Arkham has been treating, Arkham dons his mother's wedding dress.

Salt

When Batman comes to Arkham Asylum, he finds the house surrounded by salt, which is used to drive away evil spirits.

Two-Face's Silver Dollar

Two-Face uses a silver dollar, marred on one side, to make decisions. During his treatment, Two-Face's silver dollar is taken away from him. Batman returns Two-Face's silver dollar, and in gratitude, Two-Face allows Batman to escape at the end of the novel.

Japanese Clown Fish