Tales from Dark Souls - spoilers ahead! You can follow the rest of the story here!
Turns out being an "Ashen One" has made me more fire proof than I realized, and as the flames subside I can tell that the first flame still hasn't been linked. Well, that's just great. I return to Firelink in hopes of answers, but instead find that the now sighted Firekeeper is still eager for the flames to die and that the cleric Irina is now not only blind but cannot feel anything either - a prisoner in her own body thanks to the dark tomes I had given her. She asks for death. I grant it.
Upon asking around about the whereabouts of her companion, the gargoyle helmed Eygon, it is Melentia the hag who gives me a lead - telling me that he had gone with Sirris had gone to face Holy Knight Hodrick at the Undead Settlement.
I go there to assist, scouring the area for them and soon find Eygon's corpse. Not so nearby is the mortally wounded Sirris who was triumphant against the Holy Knight who turned out to be her grandfather.
In our final conversation, I try to cheer her up saying she succeeded in her quest unlike me who failed quest to link the first flame. With her dying breath she tells me of another knight at the Cathedral of the Deep who might help.