>>43335613He's a character who was part of a series so hilariously dated out of canon that reading it now is like reading shitty fanfiction. Over the course of three books he uncovers a vast Inquisition conspiracy to turn all of humanity into a hive mind, sneaks into the Imperial Palace for a personal one-to-one conversation with the Emperor, and enters the Black Library to resurrect a Callidus assassin who could turn into a genestealer.
Also the pacing of the books fucking sucked and the entire plot can be summarized as Jaq meets waifu, Jaq loses waifu, Jaq becomes a ghost in the Webway or something.