Phobias is a Collection comprised of ten book pages dealing with the subject of phobias. These items can only be obtained by players with the Home Turf DLC from Collection Nodes found around Arkham Island.
"Pages from a textbook on Phobias. Phobias are an intense, irratiuonal fear when confronted with a certain situation, activity, or object. This subject matter comes up frequently in cases at Arkham Asylum."