The Waters of Oblivion

Morrowind

 * Tel Fyr, Hall of Fyr
 * Vivec City, Hall of Justice Secret Library
 * Vivec City, Hlaalu Records

Oblivion

 * The highest floor of the Abandoned House (and secret entrace to the Dark Brotherhood) in Cheydinhal.
 * On the bookshelf inside the Blades temple (Cloud Ruler Temple)
 * Renoit's Books in Chorrol

Skyrim

 * In a chest behind the throne in the Throne Room of Yngvild.
 * Can be bought from Urag gro-Shub in the Arcanaeum.
 * In a chest at the end of Hag's End, outside after the word wall.
 * Urag gro-Shub gives you quests to find it. Just go to quest screen and push "Show on map" and it will show you where to go.

Contents
A hundred and twenty numbered ages in the void that fated folk had grown deep-schooled in evil. Then the Bright Gods resolved to punish those faithless spirits, and shatter the unruly caitiffs, those huge, unholy scathers, loathsome to the Light. They repented exceedingly that they had gazed upon Oblivion, and seen there the first of dark kin, and welcomed them as brothers and sisters.

The Principalities of Victory beheld how great was the wickedness of the wayward spirits, and saw that they were bold in sin and full of wiles. They resolved then to chasten the tribes of Daedra, and smite darkkind with hammer and hand.

But ever shall Darkness contest the Light, and great were the Powers that breathed the void and laid waste upon one another, and no oath might bind them, so deep were they in envy and perfidy. For once the portals are opened, who shall shut them upon the rising tide?

Appearances

 * An Elder Scrolls Legend: Battlespire
 * The Elder Scrolls III: Morrowind
 * The Elder Scrolls IV: Oblivion
 * The Elder Scrolls V: Skyrim