|Name in D'ni||åKenar|
|Died||Leevobro 2, 9480 DE|
Achenar (9430 DE — Leevobro 2, 9480 DE) was the oldest son of Atrus and Catherine, and brother to Sirrus and Yeesha. He was most likely named after the star Achernar as a nod to Atrus' deep love of astronomy.
Achenar was born on Myst soon after his parents were married. When he was eleven, his great-grandmother Ti'ana died. His father, lost in grief, buried himself in his experiments, neglecting his family for extended periods. It was at this point that Achenar began to act out and develop the more violent tendencies which consumed him for a considerable portion of his life. As he grew older, he became fascinated with death, weaponry, torture, and instruments of dismemberment. Atrus began to take Sirrus and Achenar along on his journeys and eventually, unaware of his son's growing macabre interests, allowed Achenar free reign to the Ages of Myst. Achenar seemed to take great pleasure in subjugating their native inhabitants.
In 9641 DE, he and his brother devised a plan to rid themselves of their parents' oversight, and take more absolute control over the people in Atrus's Ages. They used the abandoned memory chamber on the Age of Serenia to construct a memory exchange chair, enabling them to swap consciousnesses with someone else. Their plan had been to "possess" their father, taking his place and acting out their demands under his guise. They tricked their mother Catherine into going to Riven and trapped Atrus in K'veer by taking one page from his Myst Linking Book. But their plan ultimately fell apart due to the brothers' substantial mistrust of each other. Convinced that his brother was planning to use the chair on him instead, Achenar escaped to Haven, one of the two trap books that Atrus placed in the Myst library to entrap any greedy interlopers who might uncover his lost Myst Linking Book.
Without a way to return to Myst, Achenar found himself trapped on Haven for nearly twenty years. He spent his first years on the Age living in the upended sailing ship in shipwreck cove, hunting and killing as many of the Age's creatures as he could. In so doing, he hunted a large fish-like species – the cerpatee – to extinction in the area, and severely endangered the long-term survival of another. Roughly eight years after arriving on Haven, he moved to a home-made lake-side cabin farther inland, where he began to have haunting dreams of the many victims he had tortured and killed over the years. Over time, Achenar found some degree of personal redemption for his past deeds through his interactions with a pack of monkey-like creatures called mangrees.
In 9475 DE, Atrus sought to re-establish contact with his estranged sons. Achenar quickly developed a close relationship with his little sister, Yeesha. When Sirrus attempted to kidnap her and use her as part of his plan to learn regestoy from his father, Achenar proved pivotal in Yeesha's rescue, sacrificing himself so that the Stranger could free Yeesha from her brother's grasp in Serenia's Dream world.
In the game Myst, Sirrus and Achenar was not imprisoned on Prison Ages but in Trap Books, Sirrus in a red book and Achenar in a blue book. Achenar is able to communicate through the linking panel and attempts to trick the player into bringing him all the blue pages, scattered throughout the Ages of Myst, to complete his book. If he succeeds, the player is trapped in the book and Achenar is set free in the Myst library. If the player frees Atrus instead, Atrus destroys the red and blue books, trapping Sirrus and Achenar in the void between Ages.
- The no-longer-accessible official website for Myst IV Revelation states that Achenar was 50 when Revelation took place in 9480 DE.
- RAWA, quoted on the now-defunct DLF forums. Web Archive.