Irina is located in a cell at the bottom of the sewers in Undead Settlement that requires the Grave Key . Purchase the key from the Shrine Handmaiden after handing over the Mortician’s Ashes found in the graveyard of Undead Settlement.

Head through the sewer system in Undead Settlement and speak with her to obtain the “Prayer” gesture and she’ll move to Firelink Shrine, located at the dead end to the right of Andre the Blacksmith. She accepts Miracle tomes and will expand her inventory for each that she accepts.

After purchasing any Dark Miracles:¶

Irina will slowly fall into darkness after purchasing any Dark Miracles and Eygon of Carim will kidnap her. You can find him near the boss bonfire in Firelink Shrine and defeating him will send her back to Firelink Shrine, though she will not speak with you unless you are wearing Morne’s Gauntlets.

After purchasing all Light Miracles, without any Dark Miracles:¶

Irina moves to the tower behind Firelink Shrine and become a Fire Keeper, leveling your up just like the normal Fire Keeper. If you gave her the Londor Braille Divine Tome or Deep Braille Divine Tome she’ll drop them at her new location.

Drops:

• 1,000 Souls
• Tower Key and Irina’s Ashes