Grendrek was a male Nameless under the ownership of Niv Drendow Apruk, a scientist affiliated with the Nihil, during the time of the High Republic Era. This creature was born from an egg that Marchion Ro, the Eye of the Nihil, had recovered during a mission to Planet X. In 229 BBY, Grendrek met his death when a seevi worm consumed him during a raid that targeted the Innovator, an Elite-class vessel.
Escape from Valo, a junior novel released in 2024 and penned by Daniel José Older and Alyssa Wong, featured Grendrek. This novel is a component of Phase III of the Star Wars: The High Republic multimedia initiative. The character's initial name was Deblindrix, which was subsequently changed to Grendrek. Older revealed in an interview that Apruk's subsequent creature, Deblindrix III, was given the original name instead.