Boulvar is Tancred's oldest living follower, from way back when Tancred was just a junior Inquisition agent. He came with his master when Tancred left Segmentum Obscurus and has followed him ever since. His current duties include overseeing the running of the Haegum; he is tasked with overseeing every aspect of this many-faceted place/institution – every aspect save those related to its security.

Boulvar hails from an supremely ancient Hive World somewhere far to the galactic south; so ancient that it was a Hive even during the Dark Age of Technology. Although the planet and its hives survived after a fashion, its people were forced through as series of evolutionary mutations, causing them to grow smaller, tougher, and faster. Thus was born the ab-human strain of the ratlings, a common enough sight on many of the Old Worlds that survived the Long Night.

That's right folks, GW might have removed the ratlings from 40k, but I've put them back in. But rather than make them puny overweight chefs I've made them uncommonly tough and fast for their small size – pure survival traits from thousands of years of barely surviving in hellish hives-cities that endured the Age of Strife.

Anyway, the fact that Boulvar is a ratling is hearsay only. Indeed, upon first glance he looks like a near-robotic servitor, his immaculately dressed and polished gold-and-silver body easily dwarfing most normal men. According to rumors his physical form was transferred into its current host (in fact much like the process for creating a Dreadnaught) years ago by Medicae-Interrogator Sand; ratlings might live longer than most men, but even with rejuvenation treatments age was catching up with Boulvar.