As you explore Genshin Impact's map, you'll discover shrines scattered across the world. The shrines are remnants of an ancient civilization that has been lost. You can find them dotted around the map, and if you interact with them you'll be told that you need a Deep Sanctuary Key to unlock them. If you manage to unlock them, you'll find a luxurious chest inside, filled with loot.
To get a Deep Shrine Key, you will need to complete quests or complete Abyssal Domains. Deep Shrine Keys can be collected as rewards from Archon Quests (the main story), NPC specific quests, World Quests, or Commissions/Daily Quests.
You can find the location of all shrines in the game on the map below.
Abyssal Domains are dungeons you can find on the map, and completing them will potentially reward you with a Deep Shrine Key. Many of them will have a rotating set of rewards each day and will reset every day at 4am. We're still trying to find out exactly which in-game activities will reward you with a Shrine of Depths key, and will update this guide when everything is sorted out.
It is also important to note that the Mondstadt and Liyue shrines need the keys obtained in those specific regions to be opened. When you finally have one open, you'll receive an assortment of Primogems, Adventure Rank, Sigils, Weapons, and Artifacts.
