The Black family motto in Hogwarts Legacy is "Toujours Pur," which is French for "Always Pure". The Black family believed that wizard blood and Muggle blood should never mix, and this motto reflects that belief. To learn the motto in the game, players must complete the main story quest titled "The Polyjuice Plot" by disguising themselves as Professor Black and speaking to Scrope in the Great Hall. When prompted, players should choose the dialogue option "Its to do with purity of blood" to learn the motto. Its worth noting that there is no penalty for choosing the wrong answer, and players will still learn the motto regardless of their choice.