Daniel was listening to what the professor had said. He had read about this charm from the books on their manor. And his father was an auror by profession before he died.

Daniel raised his hands, "Professor, the Charm was called the Patronus Charm and its incantation was Expecto Patronum. This charm's effectiveness depends on a happy memory. In order to conjour a full-body patronus, one must think of a powerful happy memory.