Krashrak
Krashrak , the Stalker or the Night Stalker, is a member of the Viskeon race. With his homeworld and race destroyed by the Tyranids, he became a Bounty Hunter.[1b]

Biography
Mercenary
The Stalker’s reputation reached the ears of Inquisitor Lichtenstein, who engaged the services of Krashrak to recover scrolls from an Eldar thief on the planet Mogahl Prime, containing clues to the location of the Librarium Hereticus, a collection of proscribed knowledge and techno-arcana.[1b]
For five quarts of Chlorintone, the Stalker journeyed to Mogahl Prime and returned, less than a week later, with the thief’s head and runic talisman as proof of the kill.[1b]
Karis Cephalon
He then followed the Inquisitor to Karis Cephalon, where his abilities were put to good use in service of those who cannot turn to the law and Imperium to achieve their ends. Now tales of the Night Stalker are told around the fires and drinking halls of Karis Cephalon, and wary eyes are cast to the shadows as though the very mention of his name may conjure him from thin air.[1b]
Abilities
His ectothermic metabolism enabled him to function best at night and tales of the Stalker coming in the dark for his prey became a horror story with which to frighten children and miscreants alike.[1b]