Lews Therin Telamon, having murdered all his friends and family, transmogrifies himself into a volcano, creating Dragonmount.
Oh hello there, Lews Therin Telamon. Your name sure gets dropped a lot during the course of these books, from what I can recall. With a claim to fame like yours, why shouldn’t it? You defeated and imprisoned the Dark One, but this time he struck back and poisoned the fucking well. Yes, the male half of the True Source, the sweet nectar of power and creation that you drink from regularly, is now covered with vile film of yuckity-yuck. I guess it’s a little bit like the poison darts in Assassin’s Creed games: it makes you lose your mind, attack your friends, and before too long it is fatal.
At first, Lews Therin’s mind is so divorced from reality that he can’t even acknowledge that anything bad has happened, even though the bodies of his friends and family litter the ground, slain by his own hand. Then Ishamael shows up, who I believe is going to play the role of the Big Bad in this book, if memory serves. Ishmael can also channel the One Power, but he is aligned with the Dark One. It sounds like there is some really bad blood between him and Lews Therin, and Ishmael has shown up to gloat. But that’s kind of hard to do when your enemy’s mind is so far gone that he doesn’t even realize what happened. Luckily, a little channeling sets Lews Therin’s mind straight.
Ishmael wants to break Lews Therin so completely that he will turn to the Dark One as well. But when he realizes the enormity of what the madness has driven him to do, Lews Therin teleports away and thwarts that plan — committing suicide in a most spectacular way, he single-handedly causes the formation of Dragonmount and the island that will one day be Tar Valon, the home of the White Tower.