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Achenar was the oldest of Atrus and Catherine’s children and bother to Sirrus and Yeesha.
Unlike his brother Sirrus, Achenar’s degree of insanity was more outwardly visible. Evidence of his mind frame could easily be seen from his habitats in the various ages in the form of weapons, torture devices and various other instruments.
Although we do not know how involved Achenar was in the plot to acquire the Red and Blue books of Spire and Haven, evidence of his involvement could be seen in the note left to him by his brother Sirrus in the Channelwood Age.
Achenar used the blue Linking Book where he was trapped in the prison Age of Haven until he was freed by Sirrus some 20 years later [see: Myst IV Revelation ].
Atrus
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Atrus is descended from D’ni and Surface dwellers. His grandmother Ti’ana discovered D’ni and married Aitrus a guildsman of D’ni [see: Book of Ti’ana ]. Their son, Gehn, went on to marry a surface dweller called Keta after the fall of D’ni. Gehn and Keta had Atrus who is 1/4 D’ni and 3/4 human.
Honest and noble, Atrus was left to grow up in the Cleft with his grandmother Anna (Ti’ana) after his father Gehn fled when his wife died during child birth. At the age of 14 Atrus was taken to D’ni with his father who had returned for him. Atrus however grew very disillusioned with his father and tried to escape back to the Cleft and to his grandmother Anna.
As punishment Atrus was locked in the bottom of K’veer, the island mansion in which Gehn had lived since he arrived in D’ni, with the Riven Descriptive Book. With the assistance of Anna and a Rivenese villager called Katran (Catherine), they managed to trap Gehn on the Age of Riven [see: Book of Atrus ]
Atrus settled on the Age of Myst with Catherine, who he later married, and his grandmother Anna. He later had two sons Sirrus and Achenar who later betrayed him and his wife in their desire for riches the Ages in Atrus’ library held. Atrus was trapped back in the same room his father had imprisoned him in due to his sons schemes, he was later freed by a stranger who found the Myst Linking Book that Atrus had dropped into the Fissure [see: Book of Atrus ].
Atrus later left Myst island to start rebuilding the D’ni civilization, with the help of other D’ni survivors and the people of Averone they began to rebuild on the Age Releeshahn (The Whole) that Atrus had written for them [see: Book of D’ni ]. Atrus and his wife then settled in to their new home they called Tomahna, it was there they had their new daughter, Yeesha.
Sirrus
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Sirrus was the youngest of Atrus and Catherine’s two sons and brother to Achenar and Yeesha.
Sirrus was very clever, cunning and resourceful he also had the lust for power and wealth to go with it. Unlike his brother Achenar, Sirrus insanity was kept under-wraps and it is only through his plans for power that you get a glimpse of just how far the man is prepared to go. Living in excessively opulent rooms in various Ages, Sirrus would indulge in his alcohol and drug habits.
It is speculated that Sirrus and Achenar were working with the Black Ship Pirates of the Mechanical Age [see: Mechanical Age Journal ], this is due to evidence being discovered in the Stoneship Age (a Black Ship Pirates flag). Just how involved they were with the Black Ship Pirate we do not know at this point.
Sirrus was more than likely to be the mastermind behind the plot to attain the Red and Blue books from Atrus’ library. He along with his brother were trapped in these Prison Ages that Atrus had set up to trap greedy explorers. Sirrus was trapped in the red book of Spire before escaping some 10 years later [see: Myst IV Revelation ].