Scattered across Cyrodiil are the shrines of the Daedric Princes, powerful entities from Oblivion. Each shrine offers a unique quest that, upon completion, rewards you with a powerful Daedric artifact. To initiate a Daedric quest, you typically need to be of a certain level and offer a specific item as a tribute to the shrine. The quests themselves vary wildly, from performing acts of violence to solving riddles, or even engaging in morally questionable deeds.
Examples include Azura's Shrine (requiring a Glow Dust offering at night, rewarding Azura's Star, a reusable Soul Gem), Boethiah's Shrine (requiring a Daedra Heart and a fight to the death, rewarding Goldbrand, a powerful sword), and Sanguine's Shrine (requiring Cyrodilic Brandy and a prank, rewarding Sanguine Rose, a staff that summons a Daedra). These quests are often challenging and provide some of the most unique and powerful items in the game, making them highly rewarding for any character build. Exploring and finding all 15 Daedric Shrines is a sificant undertaking.