The "Well of Ascension" is a significant location in the fantasy series known as the Mistborn trilogy, written by Brandon Sanderson. It is a mysterious and powerful source of energy that grants immense abilities to those who access it. The well is central to the plot of the second book, also titled "The Well of Ascension," where characters seek to understand its purpose and potential. In the story, the well is tied to the history of the Lord Ruler, a pivotal figure in the series. The quest for the well's power drives the main characters, including Vin and Elend, as they navigate political intrigue and personal challenges in a world filled with magic and conflict.