For 10 points, name this husband of Isis, the Egyptian god of the underworld.
He is often said to be the master of twenty-one pylons, all manned by secret gatekeepers, and he was born on a day referred to as the "Purest of Pure." He is aided by a shadowy figure known as the Sefert, with the body of a lion and the head of a hawk, and he resides throughout the Duat and in the Hall of Double Justice alongside the fearsome Ammut. The first son of Geb and Nut, he was pursued and killed by his jealous brother Seth. For 10 points, name this husband of Isis, the Egyptian god of the underworld.
He is often said to be the master of twenty-one pylons, all manned by secret gatekeepers, and he was born on a day referred to as the "Purest of Pure."
{Osiris}