The hrrtayyk ceremony, or Test of Ascension, was the coming-of-age ceremony among the Wookiees, occurring usually around the age of twelve which unlocked a young Wookiee's rrakktorr. In Basic, it translated to Test of Ascension. In hrrtayyk ceremonies, the Wookiees learned to survive in the Shadowlands, learning such survival techniques as how to avoid predators; how to make rope, tents, and utensils from various plants and plant products; the location of freshwater springs; and which plants and insects were edible, and which were poisonous. They would also engage in ritual hunts of various predators, such as the katarn. Chewbacca's hrrtayyk cenemony was in 187 BBY, when he was thirteen years old.
The Syren plant would often play a role in this ceremony, and other similar ceremonies in certain regions of the planet.
- Star Wars Adventures: Chewbacca and the Slavers of the Shadowlands (Appears in flashback(s))
- Dark Lord: The Rise of Darth Vader (Mentioned only)
- Tyrant's Test (First appearance)
- Young Jedi Knights: Heirs of the Force (as Rite of passage) (Appears in flashback(s))
- Young Jedi Knights: Shadow Academy (as Rite of passage) (Mentioned only)
- Young Jedi Knights: Darkest Knight (as Rite of passage)
- Young Jedi Knights: Diversity Alliance (as Rite of passage) (Mentioned only)
- The New Jedi Order: Agents of Chaos I: Hero's Trial (as Rite of passage) (Mentioned only)
- The New Jedi Order: Dark Journey (as Rite of passage) (Mentioned only)
- Star Wars Encyclopedia
- The Official Star Wars Fact File 9 (CHE10, Chewbacca)
- The Complete Star Wars Encyclopedia