During the Invasion of Hive Fleet Leviathan in 997.M41, Kryptman led Deathwatch Kill-teams to the Tarsis Sector to aid the Mortifactors Chapter and the Ultramarines of Tarsis Ultra against the ravenous Great Devourer. By capturing a Lictor, Magos Biologis Locard, Kryptman's Adeptus Mechanicus Biologis, created a biological weapon to use against the Tyranids and his Deathwatch Astartes used it to destroy the Norn-Queen of the Hive Fleet assaulting Tarsis Ultra.