Character from harry-potter-half-blood-prince by
Retired Potions professor lured back to Hogwarts by Dumbledore — the man who gave Tom Riddle the information he needed to create Horcruxes and has been hiding from the guilt ever since.
Slughorn collects talented and famous people the way others collect stamps — his Slug Club dinners bring together students he believes will go on to greatness. He's a pure networker, a social climber, and a genuinely talented wizard who taught Potions for decades. But he carries a terrible secret. As a young professor, he told a charming student named Tom Riddle about Horcruxes — how to split one's soul. He has altered the memory to hide his shame. Dumbledore needs the real version. Harry must extract it. Harry gets it by appealing to Slughorn's guilt and his genuine fondness for Lily Evans. The memory confirms: Voldemort asked about making not one Horcrux but seven pieces of soul. Slughorn told him.
Enormously fat, bald, with a great silvery walrus-like mustache. Prominent gooseberry-colored eyes. Wears waistcoats with gold buttons and carries an air of comfortable self-importance. Fond of crystallized pineapple.
Also known as: Slughorn, Horace, Horace Slughorn, Professor Slughorn