Zar-Quaesitor is a massive freighter-hulk and Ark Mechanicus of the Adeptus Mechanicus. It serves as the flagship and mobile laboratory for Magos Dominus Belisarius Cawl. Primaris Space Marines were produced within its hull.
There is no actually a shipmaster on the Zar-Quaesitor. The reason for this is the solid system created by Cawl, where the impressive "personality" of the ship interacts with the network consciousness of the ship's tech-priests. Although the captain's post sometimes occupied by Cawl himself.[2a]
Everybody of the Zar-Quaesitor's crew has been mind-swept multiple times for reasons of secrecy.[2a]
During the Indomitus Crusade, the Zar-Quaesitor was invaded and boarded by the forces of Fabius Bile, who Cawl suspected was after the Sangprimus Portum. In truth however Bile sought Alpha Primus, the original Primaris Space Marine, and was able to escape with the Marines Progenoid Glands. During Bile's attack the Zar-Quaesitor was invaded by large numbers of Beastmen, Terata, Mutants, and other abominations and was subjected to a massive hacking attack that disabled most of its key systems.[2b]
- 1: Codex: Space Marines (8th Edition) pg. 19
- 2: Genefather (Novel)