For 10 points, name this husband of Isis and father of Horus, the Egyptian god of the underworld.
With a cult center at Abydos, this god was usually depicted wearing a crown with ostrich feathers, and he eventually became conflated with the corn god Neper, and later to the bull god Apis in a syncretic deity known as Serapis. This god carried a crook and flail, and was found in a tamarisk tree at Byblos by his wife, who was his sister since both were children of Geb and Nut. This god was cut up into fourteen pieces by his jealous brother Set, after which he became ruler of a location where dead souls were weighed by Anubis against the feather of Maat. For 10 points, name this husband of Isis and father of Horus, the Egyptian god of the underworld.
With a cult center at Abydos, this god was usually depicted wearing a crown with ostrich feathers, and he eventually became conflated with the corn god Neper, and later to the bull god Apis in a syncretic deity known as Serapis.
Osiris [Accept Usiris.]