During night time in the Graveyard, Lady Tairla Mhoire will rarely appear in the open (people who hunt Graveyard regularly will see her perhaps once or twice a month). Kill her then talk to her shade that appears (several people can talk to her) for a key that opens the Sealed Vault in one of the bunkers. If morning comes before she dies she will disappear.
The Spectral Handmaiden shatters into deadly ice shards!
Her corrupted form destroyed, the spirit of Lady Tairla appears.
Lady Tairla says, "I can linger in this place for only a short time. Come speak gentlefolk."
Lady Tairla Mhoire tells you, "The endless dance of madness caused by this... corruption had ended, at least for a time."
Lady Tairla Mhoire tells you, "I can not thank those who have given me this peace enough, however brief. Take my key and seek my hidden vault. The treasures there are yours."
Lady Tairla Mhoire gives you Lady Tairla Mhoire's Key.
Lady Tairla Mhoire tells you, "I thank you for your grace and bravery."
Lady Tairla Mhoire bestows to you the title "Lady Tairla's Champion."