Okay, pretty much my only source is PST because i'm Clueless and have no other refrences. However, from PST text one could draw the following flow of logic:
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1) Dak'kon was a Zerth.
a. Dak'kon carries a Karach blade
b. "The blade is a symbol carried by the *zerth*. A *zerth* is one who *knows* the words of Zerthimon."
//
2) He was not a novice zerth.
a. "Long have I *known* the words of Zerthimon. Through my voice, many have come to *know* the words of Zerthimon."
//
3) He began to doubt that the true meaning of Zerthimon's teachings where understood.
a. "It came to pass that I spoke the words of Zerthimon without *knowing* the words of Zerthimon."
b. "I *knew* the words. Yet it came into my heart that perhaps others did not *know* the words as Zerthimon *knew* them."
//
4) He caused division within the Githzerai.
a. "And so division formed. As my mind became as two, as my mind became divided, those that looked to me as a guiding stone became divided. Many scores of githzerai, many hundreds of scores of githzerai... doubted."
b. "When a mind does not *know* itself, it is flawed. When a mind is flawed, the man is flawed. When a man is flawed, that which he touches is flawed." Dak'kon paused. "It is said that what a flawed man sees, his hands make broken."
c. This division weakened Shra'kt'lor.
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5) This leads to a defeat at the hands of the Githyanki
a. "The enemies of Zerthimon came. *Know* that their hatred of his words and the People lent their blades strength. *Know* that they sensed the weakened city, and they brought war with them."
b. Of the two enemeies the Githzerai have, the enemies that attacked had swords, Illithids use flesh not steel... which suggests that the enemies where the Githyanki.
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6.1) Shra'kt'lor was destroyed psysically or spiritually as a result of the dividion Dak'kon created.
a. "Shra'kt'lor died that day."
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6.2) Dak'kon became lost.
a."As I fell from the walls of Shra'kt'lor, *know* that my self was broken."
b."My blade was mist, my mind divided."
//
7) Either way, it appears that Shra'kt'lor was not destroyed irrevocably.
a. "I died for days, my mind awash in division."
b. Dak'kon recovered, which suggests Shra'kt'lor could have recovered.
//
After the death of Shra'kt'lor, Dak'kon had become the last Zerth.
a. "Dak'kon, *zerth* of Shra'kt'lor-Drowning, last wielder of the *karach* blade, know that I have come to you with the words of Zerthimon, carved not in chaos, but in stone, carved by the will in an Unbroken Circle."
b. Remember: "The blade is a symbol carried by the *zerth*."
c. The others may have died or they may have or come to not *know* themselves and therefore their blades "became mist" and they lost the rank of Zerth.
d. After being given the unbroken circle Dak'kon again comes to *know* himself.
e. Do Zerths have to have a Karach blade or is this only higher ranking zerths? What do you think the above implies?
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Note: I think that the division Dak'kon creates was when he came to know the fifth circle and unlocked the sixth.
"Upon reading the Unbroken Circle, I *know* now that I took the *knowing* of the Fifth Circle and used the Power of One to bring about the Sixth Circle in Shra'kt'lor. In so doing, I divided the People. There was much suffering. I carry Shra'kt'lor with me always."
//
"Dak'kon... there is one other thing I would *know.* Why is Vilquar's Eye in the Circle of Zerthimon? It seems strange. It tells of how the People benefited from a treachery from their own. It seems - "
Dak'kon's eyes flash. "I have told you it is part of the telling of how the People came to *know* freedom. Do you not listen?" His voice flattens, as if he is reciting a passage from memory. "It tells the People that even in the greatest treachery, a greater *knowing* may be achieved."
From these two paragraphs I would suggest that Dak'kon sees his division of Shra'kt'lor as a treachery and wants to see the fifth circle as suggesting that some good for the people arose from his actions.
(Though to TNO it "doesn't sound to me like you believe that")
I do not *know* enough to say what it really intends, at least at the moment. I'm tired so I think I will do something else for a bit. I may have been writing utter rubish, or stating the obvious, but I hope that some people find this interesting.
Is that a question?