Chapter Master Thorcyra - Thorcyra was the first Chapter Master of the Scythes of the Emperor. He, along with the remnants of the Scythes' entire Company, were wiped out to a man during the Battle of Miral by the Tyranids of Hive Fleet Kraken.
captainblacklobster: “The degeneration of the Raven Guard gene-seed means several of the unique organs of the Space Marines no longer work properly or no longer grow. Raven Guard do not have the Mucranoid or Betcher’s Gland.
The Emperor's Champion is an ancient the Imperial Fists have had since the Great Crusade, in which an initiate or recruit is chosen at random, proves himself on an impossible mission, and is given the right to charge into battle as the Emperor's Champion