Who is Rab in harry potter and the half-blood prince?

RAB is Sirius's younger brother, Ray Guller Alfred Black.

As a defender of pure blood, Ray Guller Alfred Black, Ray Guller was one of the first people to join the Death Eaters, but his evil deeds were not recorded in the book. Sirius said in the Order of the Phoenix that the original Death Eaters did not torture Muggles and Mapo wizards as they did later, and he followed Voldemort for blood and strength. He joined the Death Eaters at the age of 16, from "being proud of serving the Dark Lord" at the beginning to fighting with his life three years later.

Ray Guller sacrificed his life for Voldemort's horcrux in order to destroy the immortal myth of the Dark Lord. And he doesn't even have a decent helper around him. It seems that he is braver and more persistent than any member of the Order of the Phoenix.

Unlike other death eaters and the Dark Lord, he treats the lives of house elves and muggles like dirt. When he realized that the Dark Lord was trying to kill Kreacher, he changed his mind and realized that Voldemort was cruel and violent. He came to the black lake cave to destroy the horcrux, preferring to drink poison rather than elves.

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He ordered Kreacher to destroy the pendant, but Kreacher failed. He is R.A.B Xuanyuan XIV, the alpha star of Leo, and the brightest star of Leo. It means "prince" in Latin; Arcturus is the alpha star of Capricorn, the brightest star in Capricorn and the brightest star in the night sky in the northern hemisphere. ?

From the kerry incision of the elf, we can know that although Regule has the idea of maintaining pure blood, he is actually a kind and gentle person, and he is very kind to the domestic elves. The courage and fearlessness he showed when he took the Horcruxes completely subverted Sirius' image of a "cowardly and evil death eater". As a student, he was a seeker for the Slytherin Quidditch team.