Arkham's Personal Collection is a collection comprised of items from inmates and visitors to Arkham Island. These items can only be obtained by players with the Home Turf episode from collection nodes found around Arkham Island.
"Doctor Jeremiah Arkham's methods are... uncoventional. He believes this personal collection of articles from inmates, employees, and visitors gives him insight into their psyche. Someone might find this disturbing collection rather valuable."
"On its face, this collection of mementos may seem meaningless, but they actually answer a lot of questions about what is going on behind the doors of Arkham Asylum."