was horrible. Subsequently, Neville receives another Howler from his grandmother after Sirius Black uses his list of passwords to enter the Gryffindor common room in Harry Potter and the Prisoner of Azkaban. Hermione receives one in Harry Potter and the Goblet of Fire after Rita Skeeter publishes a false article about a relationship between Hermione and Harry. In Harry Potter and the Order of the Phoenix, Dumbledore sends Harry's aunt Petunia Dursley a Howler to remind her of the agreement to allow Harry to live at Privet Drive when Harry's Uncle Vernon attempts to throw him out. Concealers Deluminator [[Image:Albdelumin.jpg|thumb|upright|Dumbledore is using his deluminator in the film Harry Potter and the Philosopher's Stone]] A deluminator is a device invented by Albus Dumbledore that resembles a cigarette lighter. It is used to remove or absorb (as well as return) the light from any light source to provide cover to the user. In Harry Potter and the Philosopher's Stone, Dumbledore uses the deluminator (then referred to as the Put-Outer) to darken Privet Drive, where the Dursley family's house is located. It was seen in Order of the Phoenix where Dumbledore loans the deluminator to Alastor "Mad-Eye" Moody, who uses it when transporting Harry from the Dursleys' home to Sirius's home at Number 12, Grimmauld Place. In Half-Blood Prince, Dumbledore uses the deluminator again to darken Privet Drive before collecting Harry. In Deathly Hallows, it is bequeathed to Ron by Dumbledore in his will. Later in the book, after Ron had left his friends in anger, the deluminator demonstrated an additional capability, similar to a homing device. Ron hears Hermione through the device as she says his name for the first time since he left, and, when he clicks it, the emitted ball of light enters his body and allows him to locate and apparate to the vicinity of Harry and Hermione's camp. J. K. Rowling stated Dumbledore left it to Ron because he believed he might have needed a little more guidance than Harry and Hermione. Invisibility cloak Within the Harry Potter universe, an invisibility cloak is used to make the wearer invisible. All are very rare and expensive. In Fantastic Beasts and Where to Find Them it is said invisibility cloaks may be spun from pelts of the Demiguise. Invisibility cloaks can also be ordinary cloaks with a Disillusionment Charm or a Bedazzlement Hex placed on them. Over time, these cloaks