Umbridge's Magic Punishment Quills

"No, not with your quill. You're going to be using a rather special one of mine.-''Dolores Umbridge to Harry Potter.

Detention

In the early 1995-1996 school year, Dolores Umbridge gave Harry Potter a detention for claiming Lord Voldemort had returned (his claims would be proven true months later at the Battle of the Department of Mysteries). When he arrived, he was told to write 'I must not tell lies' until the message 'sunk in'. When Harry reached for his quill, she told him he would be using a rather 'special' one of hers. The quill cut into Harry's skin and used his blood to write the lines. Umbridge later used these quills to punish members of Dumbledore's Army