Czevak has become arguably the Imperium’s foremost expert on the Aeldari, culminating a long lifetime’s study with an extended period living aboard a craftworld and becoming one of a handful of humans admitted to the Black Library by the enigmatic Harlequins. That achievement made him a target of the Chaos sorcerer Ahriman, who captured the ageing Inquisitor to wring the Library’s location from him. Czevak’s fate is not known for sure, but tales are surfacing of a strangely rejuvenated Czevak reappearing to his former Acolytes from the Eldar Webway, which he can somehow navigate and from which he continues his machinations against Unknown and Eldar both.