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did he try to kill atrus?
Yes, he did.
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is he crazy, because he has to have a reason for doing all those things.
Gehn was born into the great city of D'ni at the height of the civilization. Being half-human, he was derided and ridiculed by the people there (doctors brought in to treat him as an infant would refuse to do anything because they say him as an abomination, his peers in the strict Guild system mocked him, etc.). Then, the civilization fell, due in part to the arrival and actions of his mother (Ti'ana, a human from the surface of Earth). In this, his father died, and he saw all the glory and splendor of D'ni be thrown down. At the time, I think he was 5 years old (I'm not sure - he
was very young). His mother would raise him alone in the desert (on the surface of Earth - from Uru, we see this would be in present day New Mexico). When he became old enough, he left presumably to go to D'ni.
During this period of time, we don't know much of what happened. He married an Amad woman named Keta (the Amad were a native culture of humans that lived around the Cleft - they had some advanced technology, which Gehn believed showed they were descended from the D'ni). His wife had troubles in childbirth, though, and she died in Ti'ana's home (Gehn had brought her to his mother, but too late). She bore a son who Ti'ana would name Atrus (after Aitrus, Gehn's father). Gehn abandoned his son there, and left recklessly.
Between his childhood and the time he came back (when Atrus had grown up), Gehn had explored some of D'ni. Due to his insecurity over his race, he obsessed over the D'ni and gained mistaken impressions from the ruins of the city. He saw the D'ni as gods, creating Ages out of nothing. He felt that he had to rebuild the D'ni civilization, and that he and his son would become the leading gods of the new D'ni - with thousands of Ages under their control. This reaction may have been in part due to the contrast between the humble desert of Earth and the ruins of D'ni (and exaggerated memories of its splendor). It may have also been a way that he avoided the pain of his failed attempts at Age writing (he had nobody to teach him, and was a very poor writer with many mistaken ideas about the craft). After seeing natives die in his Ages, he might have felt guilt, which would transfer itself into the excuse that he was a god who could create and destroy as he wished. He also gained an addiction to an inhaled drug.
He returned for Atrus and took him down to the D'ni city. He seems to have wanted someone to look up to him, and someone who could understand him. His drug induced angers, though, and his inability to accept his failures and mistaken views of the Art (because Atrus was a better writer than he was, because he took time to understand the reasons behind things instead of blindly copying phrases from other books [because Atrus didn't feel a need to compensate for his heritage, and didn't feel a need to make thousands of Ages to rebuild the civilization]) disillusioned Atrus. Atrus realized that his father was simply a posturing and pitiful man, and tried to escape and to fix the problems in his father's works. Gehn was hurt by this, but also saw a potential use for it. He trapped Atrus in a room with only a link to Gehn's 5th Age (Riven, but Gehn only numbered his Ages), which Gehn needed to fix. Through this, Atrus met Katran (who he stubbornly called Catherine) and fixed the main problems of the Age. While Atrus was doing this, Gehn decided that he would marry Katran (who was a very intelligent student of the Art). However, Atrus and Katran had fallen in love. They planned an escape, and (in short), were able to leave Gehn trapped in Riven without any links out (so he couldn't return to D'ni or his other Ages).
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and why on earth was he pretending he was a god and trapping catherine. is there a reason?
Gehn believed he was a god. He trapped Catherine because she had been leading a rebel movement against him (the rebel movement almost worshiped her), and because he expected Atrus to come after her (with a linking book back to D'ni).
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is there a reason he is so desperate to be freed that he touches the trap book? isnt he aware it could be a trap?
Gehn has been isolated on Riven, among natives who he believes are below him (and who hate and fear him), for years (twenty?). He has no way back to D'ni (which has all that is left of the D'ni civilization, as well as the only connection to any D'ni left, and to the materials and information that he uses to make books and such [although he is able to cobble together poor quality books in Riven]). The trap book looks like it is a link to D'ni (a place he recognizes, which was part of his temporary residence in D'ni). He is aware that it is a trap, though, and so wants you to link in first (because, he assumes, you wouldn't link into something you knew was a trap).
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why did atrus want to trap gehn?
Atrus knew his father was very dangerous, but did not want to kill him.
meme11 wrote:
when gehn tries to say that hes reformed, is he really, or is he just lying?
He has changed, but he's still very dangerous. It might be that part of him really does want to reunite with Atrus (although his pride would probably only allow this on his terms), and to reform his ways. He even does seem to be showing some (condescending) care towards the Rivenese (mixed with a lot of anger). However, his misplaced pride and hatred make him a very evil and very dangerous person. If you ever play through the bad endings in Riven, you'll see just how much he has "changed".