In The Blood of Dawnwalker, Shrines are important locations that act as hubs for several useful gameplay functions. Once you discover and activate a Shrine, you can use it as a fast-travel point to move between other discovered Shrines.
Shrines are also where you can spend your skill points to unlock abilities in Coen's three main skill trees: Swordmastery, Witchcraft, and Vampirism. Certain abilities require you to find specific manuals before you can unlock them.
You can also use Shrines to access your item storage, which is helpful when your inventory becomes full. In addition, Shrines can be used to manage the passage of time, allowing you to rest and advance the day or night cycle when necessary for certain quests.