Hwygir was a neophyte in the Scythes of the Emperor, after the fall of Sotha. He was a member of the 21st Salvation Team under Sergeant Tiresias, and carried the squad's heavy bolter.
He came from the death world of Miral, and was described by his peers as a "trog-savage" and a "stunted runt".
Upon becoming a Space Marine, he chose the name 'Culmonios' for himself.
He died aboard a Tyranid Hive Ship, shot in the back of the head by a xenos bio-weapon.