The tome is located in Lothric Castle. From the Dragon Barracks bonfire the player can proceed through the area until they reach the Dragonslayer Armour fog wall. Before entering, head to the left, dropping down to the platform containing one of the Lothric Wyverns. The tome is in the room behind it.
Giving the Braille Divine Tome of Lothric to Irina of Carim will unlock the following miracles: